Subjects -> MINES AND MINING INDUSTRY (Total: 82 journals)
Showing 1 - 42 of 42 Journals sorted alphabetically
Applied Earth Science : Transactions of the Institutions of Mining and Metallurgy     Hybrid Journal   (Followers: 4)
Archives of Mining Sciences     Open Access   (Followers: 1)
BHM Berg- und Hüttenmännische Monatshefte     Hybrid Journal   (Followers: 1)
Canadian Mineralogist     Full-text available via subscription   (Followers: 5)
CIM Journal     Hybrid Journal  
Clay Minerals     Hybrid Journal   (Followers: 8)
Contributions to Mineralogy and Petrology     Hybrid Journal   (Followers: 11)
Environmental Geochemistry and Health     Hybrid Journal   (Followers: 2)
European Journal of Mineralogy     Hybrid Journal   (Followers: 12)
Extractive Industries and Society     Hybrid Journal   (Followers: 2)
Gems & Gemology     Full-text available via subscription   (Followers: 1)
Geology of Ore Deposits     Hybrid Journal   (Followers: 3)
Geomaterials     Open Access   (Followers: 2)
Geotechnical and Geological Engineering     Hybrid Journal   (Followers: 8)
Ghana Mining Journal     Full-text available via subscription   (Followers: 3)
Gold Bulletin     Hybrid Journal  
International Journal of Coal Geology     Hybrid Journal   (Followers: 2)
International Journal of Coal Preparation and Utilization     Hybrid Journal   (Followers: 1)
International Journal of Coal Science & Technology     Open Access   (Followers: 1)
International Journal of Hospitality & Tourism Administration     Hybrid Journal   (Followers: 14)
International Journal of Minerals, Metallurgy, and Materials     Hybrid Journal   (Followers: 8)
International Journal of Mining and Geo-Engineering     Open Access  
International Journal of Mining and Mineral Engineering     Hybrid Journal   (Followers: 5)
International Journal of Mining Engineering and Mineral Processing     Open Access   (Followers: 5)
International Journal of Mining Science and Technology     Open Access   (Followers: 4)
International Journal of Mining, Reclamation and Environment     Hybrid Journal   (Followers: 4)
International Journal of Rock Mechanics and Mining Sciences     Hybrid Journal   (Followers: 6)
Journal of Analytical and Numerical Methods in Mining Engineering     Open Access  
Journal of Applied Geophysics     Hybrid Journal   (Followers: 15)
Journal of Central South University     Hybrid Journal   (Followers: 1)
Journal of China Coal Society     Open Access  
Journal of Convention & Event Tourism     Hybrid Journal   (Followers: 4)
Journal of Geology and Mining Research     Open Access   (Followers: 11)
Journal of Human Resources in Hospitality & Tourism     Hybrid Journal   (Followers: 8)
Journal of Materials Research and Technology     Open Access   (Followers: 2)
Journal of Metamorphic Geology     Hybrid Journal   (Followers: 15)
Journal of Mining Institute     Open Access  
Journal of Mining Science     Hybrid Journal   (Followers: 2)
Journal of Quality Assurance in Hospitality & Tourism     Hybrid Journal   (Followers: 5)
Journal of Sustainable Mining     Open Access   (Followers: 2)
Journal of the Southern African Institute of Mining and Metallurgy     Open Access   (Followers: 5)
Lithology and Mineral Resources     Hybrid Journal   (Followers: 3)
Lithos     Hybrid Journal   (Followers: 9)
Mine Water and the Environment     Hybrid Journal   (Followers: 4)
Mineral Economics     Hybrid Journal  
Mineral Processing and Extractive Metallurgy : Transactions of the Institutions of Mining and Metallurgy     Hybrid Journal   (Followers: 11)
Mineral Processing and Extractive Metallurgy Review     Hybrid Journal   (Followers: 4)
Mineralium Deposita     Hybrid Journal   (Followers: 4)
Mineralogia     Open Access   (Followers: 2)
Mineralogical Magazine     Hybrid Journal   (Followers: 1)
Mineralogy and Petrology     Hybrid Journal   (Followers: 2)
Minerals     Open Access  
Minerals & Energy - Raw Materials Report     Hybrid Journal  
Minerals Engineering     Hybrid Journal   (Followers: 9)
Mining Engineering     Full-text available via subscription   (Followers: 5)
Mining Journal     Full-text available via subscription   (Followers: 3)
Mining Report     Hybrid Journal   (Followers: 2)
Mining Technology : Transactions of the Institutions of Mining and Metallurgy     Hybrid Journal   (Followers: 2)
Mining, Metallurgy & Exploration     Hybrid Journal  
Natural Resources & Engineering     Hybrid Journal  
Natural Resources Research     Hybrid Journal   (Followers: 8)
Neues Jahrbuch für Mineralogie - Abhandlungen     Full-text available via subscription   (Followers: 1)
Physics and Chemistry of Minerals     Hybrid Journal   (Followers: 4)
Podzemni Radovi     Open Access  
Rangeland Journal     Hybrid Journal   (Followers: 1)
Réalités industrielles     Full-text available via subscription  
Resources Policy     Hybrid Journal   (Followers: 4)
Reviews in Mineralogy and Geochemistry     Hybrid Journal   (Followers: 4)
Revista del Instituto de Investigación de la Facultad de Ingeniería Geológica, Minera, Metalurgica y Geográfica     Open Access  
Rock Mechanics and Rock Engineering     Hybrid Journal   (Followers: 6)
Rocks & Minerals     Hybrid Journal   (Followers: 2)
Rudarsko-geološko-naftni Zbornik     Open Access  
Stainless Steel World     Full-text available via subscription   (Followers: 17)
Transactions of Nonferrous Metals Society of China     Hybrid Journal   (Followers: 9)
Similar Journals
Journal Cover
Geotechnical and Geological Engineering
Journal Prestige (SJR): 0.611
Citation Impact (citeScore): 1
Number of Followers: 8  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0960-3182 - ISSN (Online) 1573-1529
Published by Springer-Verlag Homepage  [2469 journals]
  • Linear Classifiers for Prediction of Squeezing Conditions in Tunnels

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      Abstract: Abstract Empirical approaches play a significant part in the prediction of squeezing conditions in tunnels or caverns. On analysis of collected squeezing data from published literature, no empirical squeezing equations have been found for tunnels with a depth of more than 850 m. In this paper, an attempt has been made to generate linear classifications using rock quality index Q, rock mass number N, overburden height and tunnel span through a comparative study. 234 tunnel sections, especially of the Himalayan region, with depth up to 1900 m have been considered for the analysis. In this method, a demarcation line has been proposed to classify squeezing and non-squeezing conditions and it also allows computing probabilities of squeezing in combination with rock mass quality and tunnel depth. Further, developed equations have been compared with the existing four empirical squeezing equations in the case of the Rohtang road tunnel. The enhanced equations show better results to predict squeezing conditions for tunnels with overburden depth up to 1900 m in comparison to predictive competencies of previously existing criteria. The developed linear classifications are for deep and shallow seated tunnels in complex geological conditions using overburden height, tunnel span, rock quality index Q, and rock mass number N. The developed equations are useful for tunnel designers during the planning and support analysis of underground structures where very less physico-mechanical information are available for squeezing probability. It also suggests that the influence of tunnel depth on squeezing occurrence is a non-linear function.
      PubDate: 2022-05-20
       
  • A Simplified Method for the Nonlinear Analysis of Composite Piled Raft
           Foundation

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      Abstract: Abstract This paper presents a simplified method for the nonlinear analysis of composite piled raft foundation, CPRF, subjected to vertical loads. As a cost-effective alternative to piled rafts, the CPRF is used with weak soils for low-rise to medium-rise buildings. The raft is analyzed by the FE formulation for a thin rectangular plate. The granular layer is idealized as an incompressible shear layer. The weak soil, short piles and long piles are expressed as soft, semi-stiff and stiff nonlinear springs. The interaction between springs is taken into account by a shear parameter based on the Vlasov model and the interaction between long piles springs is also considered. Compared with the results of the 3D FEA available in the literature for a varied number of problems, the present method provides reasonable results and, thus, represents a significant improvement in the prediction of the CPRF behavior. A parametric study is carried out to investigate the effect of various parameters, i.e., number of long and short piles, area ratio of short piles, stiffness of short piles, and stiffness of granular layer, on the behavior of the CPRF. The findings of this study could be helpful for achieving economical design for the CPRF.
      PubDate: 2022-05-18
       
  • Experimental Research on the Proportion of Quasi-Sandstone Materials Based
           on Frost Resistance Characteristics

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      Abstract: Abstract The frost resistance characteristics and deterioration law of rock masses under freeze–thaw cycles in cold regions are important prerequisites for engineering design and stability analysis. In traditional experimental research, there exists the problem of sample selection bias caused by the heterogeneity and anisotropy of the original rock samples, which leads to a large dispersion of experimental results. To mitigate this problem, using red sandstone in Ezhou as the target object, this research first established a similarity criterion formula. Then, to obtain reliable experimental results, 3-factor and 5-level orthogonal experiments were designed with the water-cement ratio, weight ratio of quartz sand and cement, and silica fume content as control factors. Finally, a freeze–thaw cycle experiment was conducted. Based on the control indices of strength and porosity, preliminary screening of the proportion was subsequently carried out by comparing the parameters of the original sandstone, and 3 schemes stood out consequently, based on which the freeze–thaw cycle experiments were conducted. Eventually, according to the similarity criteria and sensitivity factors such as weight, wave velocity and strength, the optimal quasi-sandstone material proportion scheme was determined as follows: water and cement ratio (0.42), quartz sand and cement ratio (1.1), and silica fume content (0.1%). The experimental results further reveal the deterioration law of sandstone under freeze–thaw cycles, which indicates that with the increase in freeze–thaw cycles, the frost resistance parameters of sandstone show a downward trend, and the frost resistance gradually decreases. The descending order of the sensitivity of the frost resistance indices of sandstone to the effect of freeze–thaw cycles is the strength deterioration coefficient, wave velocity deterioration coefficient, and weight loss ratio.
      PubDate: 2022-05-18
       
  • Experimental Study on the Rheological Shear Mechanical Behavior of Bolted
           Joints

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      Abstract: Abstract Landslides, which are predominantly caused by the rheological behavior of preexisting joints, occur frequently around the world and are among the most catastrophic disasters. However, most researchers have rarely considered the rheological characteristics of bolted rock joints. In this study, based on rock-like materials, rheological direct shear tests of joints with and without anchor bolts were carried out, and direct shear tests were conducted for comparison. The results showed that under direct shear conditions, with the presence of bolts, less spalling and failure of the rock mass occurs, and the shear strength of the joints was significantly enhanced. Under rheological direct shear conditions, joints with bolts have more total rheological shear displacement, but the effect of the bolt on the shear displacement of the steady creep stage was not obvious, and the shear stiffness of the rock mass was reduced by the coupling effect between the bolt and joint. Using the Mohr–Coulomb criterion for further analysis, we found that during the rheological process, the reinforcement of bolts mainly focuses on cohesion, while under direct shear conditions, the reinforcement of bolts is mainly reflected in the internal friction angle. This study is expected to provide theoretical guidance for landslide control and protection and to further reduce the occurrence frequency of geohazards. This research is expected to provide theoretical guidance for the prediction and prevention of geological disasters.
      PubDate: 2022-05-17
       
  • Response Characteristics of Slope Subjected to Blasting: A Case Study in
           Manaoke Open-pit Gold Mine

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      Abstract: Abstract Frequent production blasting is an important factor affecting the slope stability in open-pit mines; thus, it is essential to monitor and analyze blasting vibrations in open-pit mines. In this study, blasting vibration on the slope of an open-pit gold mine in Manaoke was monitored. First, regression analysis was performed on the monitoring results using the Sadowski formula, and the attenuation law of the slope blasting vibration was established. Second, the damage depth of the retained rock mass was determined using ultrasonic velocimetry, and the relationship between the damage depth and peak particle vibration velocity was fitted. Third, the Midas numerical software was used to analyze the stability of the slope under blasting vibration conditions. The results showed that the fitted vibration attenuation formula was close for four consecutive days, and the slope blasting activity was within a safe range. Ultrasonic velocity measurements showed that the damage depth of the reserved rock mass after blasting was between 1.0 and 1.5 m. The damage depth had a good correlation with the peak particle vibration velocity, which can adequately predict future reserved rock mass damage. The final numerical calculation results showed that the slope was in a stable state, and the slope stability was not considerably affected under the daily blasting vibration conditions. Thus, the blasting activities were in a safe range.
      PubDate: 2022-05-17
       
  • Embankment Dam Design with Dispersive Soil: Solutions and Challenges

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      Abstract: Abstract The configuration and safety factor of rockfill dams design depend on materials used in construction of the dam. In some regions, the available materials for using as impermeable element of the dam body are dispersive and it is inevitable to consider the dispersivity of the material in the design and construction. Internal erosion through cracks or other openings in the embankment is the most concern of using the dispersive soils. The authors have designed an embankment dam by using dispersive soil in East Africa after finalizing the dispersivity of materials based on the required tests. The foundation of dam and borrow areas consisted of dispersive soil and the effective measures has been considered in the design to safely deal with dispersivity according to recommendation of the design codes. The selected solution was the combination of chimney filter, filter drain, and selective placement of materials in the dam body as the effective solution considering the specification of the project. More precautions in addition to general recommendation have been incorporated into the design criteria due to placing the project in high hazard category. The local instability in the contact zones was the concerns of designers and bilinear parameters has been considered in the stability analysis as the base case. A drainage layer was added into half of the length of filter blanket and the feature of the design was determined according to nonlinear static and dynamic analysis of the dam body. This paper presents the measures and precautions that were taken into account in dealing with dispersive soil in order to ensure the safety of design.
      PubDate: 2022-05-16
       
  • Assessment of Lateritic Gravelled Materials for Use in Road Pavements in
           Cameroon

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      Abstract: Abstract Early surface and structural deterioration of new pavements are becoming increasingly perceptible in Cameroon. This raises serious concerns regarding the nature, spatiotemporal evolution, and quality of materials used. Therefore, this study uses geotechnical identification, X-ray diffractometry, and statistical methods to optimize the durability of lateritic gravelled material (LGM) pavements. The CBR values within the study sites are dispersed and present low variability (coefficient of variation-CV < 15%), to high variability (CV > 35%). Three groups of LGM were distinguished at the Bamileke Plateau: firstly, LGM at the BAN site were characterized by CBR (31%). Secondly, LGM of Bamendjou 1 and Bamendjou 2 sites, characterized by CBR varying between 25 and 27%, CI between 1.3 and 1.5, gravel content among 62.7 to 64.7%, and MDD between 1.76 and 1.82 g/cm3. Thirdly the Sekakouo and Chenye sites LGM are dominated by fines with C80µm between 38 and 44%. Swelling clay minerals are absent in these materials. It results that, these materials are suitable for use as a subgrade layer for any type of traffic, and as a sub-base for low-volume traffic T1 to T3, except those at the Sekakouo and Chenye sites. Prospecting of LGM deposits should be directed towards those with high proportions of Gm, gravel content, MDD, CI, SG, and low proportions of Pm, C80µm, C400µm, Pp, ɛs and C2mm.
      PubDate: 2022-05-16
       
  • Unconfined Compression Strength of Polymer Stabilized Forest Soil Clay

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      Abstract: Abstract Due to undesired mechanical characteristics, some forest soils cause problems in road construction. Several methods have been proposed for stabilizing these types of soils. In this paper, the impact of two polymer materials on unconfined compression strength of a forest soil is investigated. The unconfined compression strength (UCS) tests were carried out on the soil samples treated with two different polymer materials as well as the control sample. The results of UCS tests show an increase in the maximum dry unit weight by adding polymeric materials of RPP (Road Packer Plus) and CBR Plus (California Bearing Ratio Plus) to the soil. The results also show that polymeric materials improve the UCS of the soil that is dependent on the percentage of polymeric materials and curing time. According to the obtained results, treated samples indicate an increase in the strength with different percentages of RPP and CBR Plus as 32.143–91.30% and 55.84–168.56% for 0.019–0.1% and 0.0096–0.09% content of materials, respectively. The results show that the highest level of the stress and strain for RPP were 151.42 (kPa) and 4.6% (with addition of 0.1% RPP) and 167.13 kPa and 3.1% (with addition 0.09% CBR Plus), respectively.
      PubDate: 2022-05-16
       
  • Water-Borne Erosion Estimation Using the Revised Universal Soil Loss
           Equation (RUSLE) Model Over a Semiarid Watershed: Case Study of Meskiana
           Catchment, Algerian-Tunisian Border

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      Abstract: Abstract Soil erosion is one of the major environmental problems in the Middle East and North Africa (MENA) region. Favoured by the harmful effects of climate change, and intensified by heavy rainstorms, droughts, runoff, soil features, and land cover; the Meskiana catchment, NE Algeria suffers hugely from this hazard. The main purpose of the present study is to adapt the RUSLE model to map the spatial distribution of soil erosion susceptibility in dry climate watershed based on the geographic information system (GIS) and remote sensing (RS) technique. The model considers erosivity (R), topography (LS), erodibility (K), cover management (C), and support practice (P) as the main predisposing and triggering parameters of the phenomenon. For data processing, slopes, precipitations, lithofacies, Normalized Difference Vegetation Index (NDVI), drainage density, and land use were integrated. Some parameters of the model were estimated using RS data and the erosion susceptibility was mapped using GIS. The results showed that the annual soil loss is about 61 t/ha/year in the entire study area, and identified the most heavily eroded areas, requiring immediate action. The compilation of GIS-RS geospatial technologies with field survey made it possible to assess the spatial variation of soil erosion quantitatively and rapidly. It can assist managers in the implementation of land degradation mitigation program with low-costs and enhanced accuracies.
      PubDate: 2022-05-16
       
  • Optimisation Study on Crack Resistance of Tunnel Lining Concrete Under
           High Ground Temperature Environment

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      Abstract: Abstract In the construction of tunnels in environments with extreme temperatures, excessive temperature differences will lead to the early cracking of concrete lining after pouring, which subsequently affects the safety and durability of the tunnel lining structure. On the basis of the secondary development platform of ABAQUS, this study compiled a series of subroutines for the analysis of the hydration heat release, thermal mechanical coupling and temperature humidity coupling of early-age concrete. Combined with the extended finite element method, the temperature humidity stress multifactor coupling numerical analysis model is established. Subsequently, the early-age cracking mechanism and control measures of tunnel concrete under the high ground temperature of the surrounding rock environment were examined and verified by field-measured data. Studies have shown that 57.8 °C is a critical temperature in theory. When the surrounding rock temperature is lower than this value, the lining can be normally constructed without early cracking. Meanwhile, when the surrounding rock temperature exceeds this value, wall-mounted thermal insulation materials must be used to avoid surface cracking due to the large temperature gradient of lining concrete. The conclusions obtained in this research can provide reference for the design and construction of tunnels under high ground temperature.
      PubDate: 2022-05-13
       
  • Directional Support Method for Tunnel Jointed Rock Mass

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      Abstract: Abstract In order to explore the directional support method of jointed rock mass and ensure the stable operation of roadway, the support effect of jointed rock mass was analyzed by numerical simulation and on-site monitoring. The results showed that directional support could effectively reduce the deformation and ensured the stability of surrounding rock. In the process of directional reinforcement support construction, the plane formed by multiple bolts was guaranteed to be perpendicular to the structural plane, and the bolt hole extended along the normal plane of roadway, the control effect of this support mode was the best. The stress change law of surrounding rock of roadway was monitored by using borehole force meter. The results showed that the stress released occurs in surrounding rock of roadway after excavation, and the cumulative stress change value did not increase 5 to 7 days after excavation. The jointed rock mass remained in a stable state under the action of directional reinforcement support. The directional reinforcement of roadway surrounding rock had a good control effect on roadway stability.
      PubDate: 2022-05-12
       
  • Earthquake Response of Ring Foundation in Cohesionless Soil

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      Abstract: Abstract Ring foundations are commonly adopted to support tall and heavy cylindrical structures such as silos, chimneys, cooling towers, circular storage tanks, and windmills. The construction of these structures in the earthquake-prone region poses a high risk due to the limited knowledge about their behavior under the earthquake loading when supported on a ring type of foundation. The present study focuses on analyzing the response of ring foundations resting on cohesionless soil during the event of an earthquake. A three-dimensional finite element numerical analysis was carried out to study the behavior of the ring foundation-silo system during the event of an earthquake. The variation in ring geometry such that the ratio of inner to the outer radius (Ri/Ro) was 0.2, 0.4, 0.6, and 0.8, soil densification (γ) under loose and dense condition, the height of silo (h) of 15 m (squat silo) and 25 m (slender silo) and the different earthquake loadings were considered to study their effect on peak acceleration and horizontal displacement of ring foundation. The input motions from 1979 El Centro, 2001 Bhuj, and 1989 Loma Prieta earthquake were considered for the dynamic analysis. The results indicated a decrease in the horizontal displacement of the ring foundation with an increase in height of the structure and soil densification. The foundation displacement was irrespective of the ring geometry for squat silo but showed variation with ring geometry for slender silo. The peak acceleration at the base of the ring foundation was observed to be increased with a rise in height of the structure and soil densification.
      PubDate: 2022-05-12
       
  • Prediction of Water Inflow into Tunnel Crossing Intersecting Faults Based
           on IDB Seepage Model

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      Abstract: Abstract Water inrush accident into tunnel has become a bottleneck problem restricting the construction of deep-buried long tunnels, and the effect of intersecting faults on water inflow into tunnel is more complicated. Based on in-situ water pressure test data, the change law of the seepage characteristics in fault zone is analyzed, and an improved Darcy–Brinkman seepage model based on the theory of three-district zoning of faults is established. By assuming that the permeability coefficient conforms to the superposition principle, the underground seepage numerical model of intersecting faults that with perpendicular directions to tunnel is established. Then five calculation conditions are analyzed when the tunnel excavation axis is located at different relative height of the fault intersection center, so as to obtain the effect of the relative vertical location of the tunnel to the fault intersection center on the water pressure field, the seepage velocity field and the water inflow into tunnel. The results show that water inflow into tunnel crossing intersecting faults has litter relationship with the upper or lower position between the fault intersection center and the tunnel, but mainly depends on the relative height between them. The smaller the relative height, the smaller the water pressure, the greater the water inflow. Compared with the theoretical formula method and the stochastic mathematical method, the numerical simulation method can reflect the gradual process of water inrush while encountering intersecting faults in excavation and the change law of water inflow in different space and time under specific geological conditions, which is most consistent with the in-situ water inflow monitoring data.
      PubDate: 2022-05-11
       
  • Correlations between SPT, CPT, and Vs for Reclaimed Lands near Dubai

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      Abstract: Abstract Artificial islands near Dubai were constructed with geomaterials of significant gravel content from other areas of the United Arab Emirates (UAE). The fills were dynamically compacted and their present geotechnical properties are unknown. Large development projects are being proposed on the islands that will require extensive field testing to characterize the fills because existing correlations developed for nearby natural soils are not representative. The main focus of this study is to develop correlations between Standard Penetration Test (SPT), Cone Penetration Tests (CPT), and shear wave velocity (Vs) measurements applicable to the compacted fills with high gravel content. More than fifty (50) SPT and similar number of CPT tests are performed on a large area of the island. A number of Multi-Channel Analysis of Surface Waves (MASW) and Downhole Seismic (DHS) tests are conducted to measure the distribution of Vs with depth and imaging. The data is analyzed to develop correlations between SPT and CPT and between SPT and Vs. The proposed correlation between SPT and CPT generally does not agree with existing correlations for coarse grained soils. This study predicts larger values of tip resistance (qc) with N60 values. The predicted Vs values as function of N60; however, are comparable with some prediction equations in the literature. The Vs values from MASW and DHS for the fill are comparable on average; however, reliability of DHS increases with depth. The results from all tests reveal the inadequacy of earlier dynamic compaction in achieving consistent and uniform densification.
      PubDate: 2022-05-09
       
  • AE and Damage Characteristics of Coal with Different Water Soaked Depths
           Under Uniaxial Compression

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      Abstract: Abstract The stability of remnant coal pillars is of great significance for safe mining of coal resources around them. The remnant coal pillars are often soaked in mine water with a certain height. Different water levels (or depths) may affect the stability of remnant coal pillar differently. In this paper, uniaxial compression tests were carried out on coal specimens with different water soaked depths. Deformation and damage characteristics of coal specimens under loading were analyzed through acoustic emission (AE) and digital image correlation techniques. The results show that the AE energy curve of each partially soaked coal specimens presents double peak, while that of fully soaked coal specimen has only single peak. As the soaked depth increases, the AE b value gradually decreases, which indicates that the micro-fracture of coal specimens decrease with the increase of water soaked depth. During deformation and damage, partially soaked coal specimens have obvious localized strain, and the local strain concentration area is basically distributed in the dry–wet transition area. While the surface of the fully soaked coal specimen presents relatively uniform deformation. Partially distributed water within coal matrix increases the heterogeneity of the coal specimens. These results reveal the deformation and damage characteristics of coal with different water soaked depths, and provide a useful reference for reasonably evaluating the stability of coal pillars.
      PubDate: 2022-05-08
       
  • Study on the Optimization of Support Parameters of Metro Station
           Constructed by Arch Cover Method

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      Abstract: Abstract The arch is the main stress structure of metro station in the construction of arch cover method. The preliminary geological survey has some limitations, and the arch structure design based on the survey results is usually too conservative, which increases the investment cost. Therefore, it is necessary to optimize the design parameters of arch structure. In this paper, based on particle swarm optimization (PSO) algorithm, the engineering cost is taken as the optimization objective, and the monitoring control values of displacement are taken as the constraint condition. The scheme optimization is carried out for the thickness of outer primary lining and inner primary lining and removal length of temporary support. The final optimization values of parameters obtained by PSO algorithm are that the removal length of temporary support is 18 m, the thickness of the outer primary lining is 22 cm, and the thickness of the inner primary lining is 26 cm. Compared with the original design scheme, the engineering cost of the optimized scheme is reduced by 8.79%. The optimized parameters can not only meet the safety requirements of the project, but also effectively reduce the project cost, which has guiding significance to the actual project construction.
      PubDate: 2022-05-08
       
  • Durability Based Classification and Characterization of the Rocks of the
           Sub-Himalayas, Pakistan

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      Abstract: Abstract This manuscript pivots around the durability results at the laboratory scale for the rocks of the sub-Himalayas. The sedimentary origin rocks of sub-Himalayas comprising sandstone, siltstone, claystone, mudstone, and silt-shale induce weathering-based failures in the cut and natural slopes. The higher weathering/slaking rates of incompetent lithologies such as claystone and mudstone cause failures in overlying competent sandstone/siltstone/silt-shale, units. During the geotechnical investigations, defining the descriptive categories of the rocks with any classification is the initial step. Slake Durability Tests are commonly used to classify and characterize clay-bearing rocks. This research utilized three different durability-based systems, and rocks were characterized. These classification systems are based on the slake durability index, disintegration ratio, and relative slake durability index. The research concludes that the relative slake durability classification over-estimates the durability of the rocks. This manuscript also concludes that a durability-based classification and detailed investigations should also be initiated for the sub-Himalayan region.
      PubDate: 2022-05-08
       
  • Numerical Analysis of Infiltration in One-Dimensional Unsaturated
           Soil–Geotextile Column

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      Abstract: Abstract Numerical modelling development for capillary barrier investigation considering unsaturated soil–geotextile interface has been studied and evaluated in recent years. Most engineering constructions involving geomaterials and geotextiles application, such as reinforced walls, slopes, embankments, and roads, require understanding the hydraulic performance of those systems for design purposes (capillary barrier, drainage, filtration, etc.). Considering that the hydraulic behavior of those materials is directly dependent on their saturated–unsaturated state over time, unsaturated principles should be applied for their long-term evaluation. This paper presents a 1D (one-dimensional) numerical analysis of an unsaturated system composed of soil and gravel layers separated by a geotextile in a column laterally impermeable (2.0 m). A non-woven geotextile was applied considering different soil types from the literature, such as silty sand, sandy, compacted residual silty, bimodal, and compacted residual sandy soils. A SEEP/W finite element numerical model was developed to perform transient analyses through the system to evaluate its hydraulic performance in terms of capillary barrier formation considering different geomaterials combinations in different hydraulic conditions. A significant influence of geotextile hydraulic conductivity and water flow rate were verified on the capillary barrier effect. Also noticed were the different height and duration of capillary barrier formation for different soil profiles. A design chart-table was proposed to evaluate soil–geotextile performance in terms of capillary barrier for new geotechnical designs. Finally, it could be inferred that fine-grained soils demonstrated to develop higher and longer water column (positive pore pressure) compared to coarse-grained soils, independently of their initial suction.
      PubDate: 2022-05-07
       
  • Experimental Study on Mechanical Properties of Fully Bonded Bolts with
           Varied Bond Length

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      Abstract: Abstract The fully bonded bolting method is widely applied in geotechnical engineering areas and is considered as an efficient approach due to its better loading capacity compared with end-anchored methods. However, the mechanical property of fully bonded bolt under various bond lengths is still unclear. This study comprises a mixed methodology of laboratorial experiments and theoretical analysis to discuss the mechanical law of fully bonded bolts under different bond lengths. Results show that the plastic debonding at the interface tends to expand as the bond length increases. Moreover, the undergoing time of the yield stage, which is between the initial and peak force stages, shows an increasing trend that is also applicable to the corresponding pull-out displacement. We have also identified that AE capturing indicated that intense energy events/values are easy to identify when the bond length increases, a phenomenon; that is closely related to the longer frictional process of the specimens with longer bond length. This study provides a reference for the design of fully bonded bolts, that is, the bond length should be carefully considered to avoid the premature failure of bolting systems due to progressive debonding.
      PubDate: 2022-05-06
       
  • Influence of Electrokinetic Process on Compressibility Behaviour of Salt
           Affected Soils

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      Abstract: Abstract The improvement of salt affected lands is a major environmental challenge in arid and semi arid regions all over the world. Electrokinetic treatment is one of the environmentally friendly and cost-effective methods that can be used in reclamation of saline soils. In this study, the effect of electrokinetic remediation (EKR) on compressibility characteristics of fine-grained salt affected soils was investigated. The soil samples were subjected to the following applied voltage gradients of 1, 2 and 3 V/cm during 7 days, followed by oedometer tests to evaluate the soil consolidation parameters. The obtained results are presented and discussed regarding to the variation of applied potential on compressibility characteristics of the treated soil samples. Experimental results show that each of compressive index and swelling index decreases with increasing the voltage, whereas preconsolidation pressure increase. These variations were attributed to water flow between electrodes and migrations of salt cations toward the cathode. Moreover, EKR demonstrates changes in soil pH as a result of electrolyse soil reactions. This research reveals that the use of EKR using direct current improves compressibility characteristics of saline soils involving a short time period. This process proves that it can be successful to soil remediation for civil engineering use.
      PubDate: 2022-05-06
       
 
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