Article
Engineering, Civil
Jaspreet Singh, Sarada Prasad Pradhan, Vikram Vishal, Mahendra Singh
Summary: Rock mass heterogeneity due to structural discontinuities poses a significant concern to transportation. Characterizing the rock mass is crucial for preliminary investigation, with the Geological Strength Index (GSI) being a commonly used method. Advances in computational techniques, such as discrete fracture network (DFN) modeling and remote sensing, provide more precise data for examining rock mass characteristics. This work focuses on incorporating DFN in estimating GSI and utilizes machine learning to digitize the standard GSI chart.
TRANSPORTATION GEOTECHNICS
(2023)
Article
Engineering, Environmental
Peitao Wang, Chi Ma, Cao Liu, Qingru Liu, Yilin Fu, Meifeng Cai
Summary: The influence of joint roughness on the failure modes of layered fractured rock during excavation was investigated using numerical simulations. The results show that the deformation modulus and strength of the layered rock mass gradually decreased with increasing excavation size, and there is a significant linear correlation between the excavation size and the corresponding strength of the rock mass.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Energy & Fuels
Yabing Zhang, Xinrui Liu, Pengshuang Guo, Peng Jia, Tianhong Yang, Fengyu Ren
Summary: In this research, a 3D bonded block model (BBM) is used to quantify the strength and permeability of fractured rock mass numerically. The study demonstrates that the numerical models converge with the Hoek-Brown strength criterion only when simulating steep and less persistent fractures. Additionally, it is found that the permeability is positively related to the strength for impermeable rock masses in the pre-peak loading stage.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Mechanical
Yifan Chen, Hang Lin, Linyuan Liang
Summary: This paper studies the freeze-thaw failure characteristics and strength loss of non-penetrating fractured rock mass with different fracture densities through theoretical derivation and laboratory tests. It explores the effects of freeze-thaw cycles and fracture density on the failure characteristics of non-penetrating fractured rock mass samples comprehensively from both the macro and micro perspectives, combining the apparent observation method with acoustic emission monitoring technique. The findings provide a better understanding of the freeze-thaw damage characteristics of rock mass and contribute to the stability assessment of rock mass.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Engineering, Geological
Yoshiro Huillca, Matias Silva, Carlos Ovalle, Juan Carlos Quezada, Sergio Carrasco, Gabriel Eduardo Villavicencio
Summary: Empirical evidence suggests that particle breakage affects the mechanical behavior of granular materials, particularly coarse rockfill materials. The study utilizes a multi-scale approach with the discrete element method to investigate the correlation between particle size and strength, revealing a decrease in particle strength as size increases.
Article
Engineering, Environmental
Dan Huang, Wen Tang, Xiao-qing Li
Summary: In this study, the relationships between nonpersistent joints and intact rock bridges in rock masses were explored using discrete fracture network (DFN) technology and synthetic rock mass (SRM) technology. The effects of geometrical parameters on the mechanical properties and failure mechanism of the models were studied. The failure process of the nonpersistent jointed rock mass under uniaxial compression was investigated, and six failure modes were predicted. The damage constitutive model fit well with the stress-strain curve and was suitable for brittle failure of a jointed rock mass.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Computer Science, Interdisciplinary Applications
Mengmeng Wu, Feng Zhou, Jianfeng Wang
Summary: In this study, discrete element method simulations were conducted on soil-rock mixture under mini-triaxial tests, taking into account the effect of particle shape. The deformation and failure characteristics of the mixture were analyzed, providing insights into the development of soil stabilization materials for geotechnical engineering.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Metallurgy & Metallurgical Engineering
Mustafa Can Suner, Ihsan Berk Tulu
Summary: This paper introduces the novel methodologies of the synthetic rock mass (SRM) approach and the discrete fracture network (DFN) model to study fracture rock mass behavior. By utilizing field surveys and laboratory experiments, the influence of natural fractures on stone mine pillar mechanics and failure mechanisms is investigated.
MINING METALLURGY & EXPLORATION
(2022)
Article
Computer Science, Interdisciplinary Applications
Jinfan Chen, Zhihong Zhao, Jintong Zhang
Summary: This study develops data-driven criteria to estimate the peak shear strength (PSS) of rock fractures, considering the effects of surface roughness features. A high-quality dataset is created using particle-based discrete element method and diamond-square algorithm. Tree-based models and convolutional neural network are trained to predict the PSS of rock fractures, and their reliability is verified using experimental data.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Engineering, Geological
D. Gottron, A. Henk
Summary: This study compares Discrete Fracture Network (DFN) modeling with empirical relationships based on conventional engineering rock mass classifications to determine the elastic properties of fractured rock masses. The results show that incorporating intact rock properties in addition to classification scores in empirical equations yields more reliable estimates for predicting fractured rock mass properties.
ENGINEERING GEOLOGY
(2021)
Article
Engineering, Geological
Kaizong Xia, Congxin Chen, Tianlong Wang, Yun Zheng, Yue Wang
Summary: This study develops a method to estimate GSI and D values using acoustic wave velocity, and proposes a new method for determining the mechanical parameters of the rock mass based on these improved values. The analysis results show that the method accurately reflects the factors affecting rock mass quality and disturbance, and its reliability is verified in practical engineering.
ENGINEERING GEOLOGY
(2022)
Article
Energy & Fuels
Chuanqi Li, Jian Zhou, Danial Jahed Armaghani, Wenzhuo Cao, Saffet Yagiz
Summary: This paper examines the geological strength index (GSI) as a new influencing factor of stability for hard rock pillars, in addition to conventional parameters, and finds that GSI has a significant impact on the stability of sloughing pillars.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2021)
Article
Engineering, Geological
Liangchao Zou, Jan-Olof Selroos, Antti Poteri, Vladimir Cvetkovic
Summary: The highly channelized groundwater flow in sparsely fractured crystalline rocks is affected by multiscale hydraulic heterogeneity in fracture networks. This study investigates the impacts of the heterogeneity on channelized flow using three-dimensional discrete fracture network modeling. A channel network model is used to simulate the groundwater flow in fractured crystalline rock, and a parameterization approach for channel conductance is proposed. The results show that the hydrogeological heterogeneity at the network scale dominates the variability of flowrates, and the proposed approach is effective in compensating for neglected heterogeneity in the model.
ENGINEERING GEOLOGY
(2023)
Article
Multidisciplinary Sciences
Yunhe Ao, Chuang Sun, Baoxin Jia, Jianjun Zhang
Summary: A construction method of variable radius proportional clump model was proposed to analyze the influence of meso-structure and meso-parameters on deep granite characteristics. The results showed that clump structure is greatly influenced by particle proportion and size while ball model is only slightly influenced by particle size. The compressive and tensile strength curves and fracture modes of numerical simulations and laboratory tests are in good agreement, and the calculated results of the tunnel after simulated excavation are very close to the engineering practice.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Civil
Yongning Wu, Yang Zhao, Peng Tang, Wenhai Wang, Lishuai Jiang
Summary: By introducing the technology of synthetic rock mass, the influence of nonpersistent joint network parameters on the mechanical properties and failure modes of jointed rock masses is studied. The compressive strength and discreteness of the rock mass change as the size of the joints in the rock mass increases. The location and density of the joints greatly affect the failure mode and displacement degree of the jointed rock mass.
GEOMECHANICS AND ENGINEERING
(2022)
Article
Engineering, Geological
Zhixiang Song, Junwen Zhang, Shanyong Wang, Xukai Dong, Yang Zhang
Summary: This study investigates the energy evolution characteristics and failure mechanism of deep-bedded sandstone under different loading conditions. The results show that the decay rate of peak strength is significant under certain stress paths. The failure degree under three-stage loading and unloading condition is relatively weak, while the failure degree under conventional loading condition is medium and strong. There is a significant linear relationship among peak elastic energy, peak strength, and peak strain. The accumulated energy in high stress concentration zones continuously impacts low state gradient zones, leading to the expansion and connection of the weakest structural plane and ultimately resulting in failure.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Construction & Building Technology
Yiliang Yu, Xiaohua Bao, Xiangsheng Chen, Jun Shen, Shanyong Wang, Hongzhi Cui
Summary: In this study, a method for enhancing the resilience of a soil-structure system subjected to earthquakes was proposed. The combination of clay replacement and a unilateral drainage diaphragm wall significantly reduced the floating displacement, restrained additional internal forces, and improved the seismic resilience of the underground structure.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Engineering, Geological
Zhouxiang Ding, Wenjun Zhang, Zhe Wang, Zhenhao Zhang, Zhaohui Yang, Shanyong Wang
Summary: This paper defines four fundamental concepts for saturated geomaterials under normal and high pressures using the general effective stress (GES) concept. The four concepts include buoyant force, submerged unit weight, seepage force, and critical hydraulic gradients. By comparing four typical GES expressions and their impacts on the definition of the four concepts, the results suggest their profound significance for geotechnical applications and the need for further validation.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Xudong Shi, Guorui Feng, Jinwen Bai, Shanyong Wang, Kai Wang, Boqiang Cui, Xinyu Yang, Cheng Song, Hongchao Zhao
Summary: FRP wrapping can improve the tensile strength of cement mortar-coal composite (CCC) by reducing the instability of the interface and modifying the failure pattern. The experimental and numerical simulation results show that FRP wrapping significantly enhances the nominal tensile strength of the specimens and reduces their anisotropy. Three types of failure modes are observed: tensile cracks in the coal and cement mortar elements, and shear or tensile fractures at the interface. FRP wrapping increases the damage degree of the coal and cement mortar elements in unstable specimens, but decreases the extent of damage at the interface.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Geological
Cong Zhang, Zhende Zhu, Shanyong Wang, Chong Shi, Wangyang Li
Summary: This study investigates the seismic failure mechanism of fault-crossing deep tunnels in strong earthquake areas through shaking table tests and numerical simulation tests. The results show that the fault dip has a significant amplification effect on peak acceleration, peak strain, and peak displacement. The fault width and relative distance also amplify parameters such as peak strain and peak acceleration. This research provides guidance for stability analysis and safety assessment of deep underground tunnels in strong earthquake areas.
Article
Engineering, Geological
Kun Du, Ruiyang Bi, Yu Sun, Chengzhi Yang, Shanyong Wang, Guichen Li, Shaofeng Wang
Summary: This study reveals the failure mechanism of rocks under the combined effects of biaxial static stress and dynamic fatigue loads through a series of tests. The biaxial compressive strength of granite increases monotonically with the increase of the intermediate principal stress. The fatigue life of granite is shorter than that in traditional full-section fatigue tests and it increases with the increase of the intermediate principal stress. The failure of rocks under biaxial confinements induced by point/local static or fatigue loads is mainly due to tensile cracks.
Article
Engineering, Geological
Sheng Zhang, Wei Liu, Xinyu Ye, Yu Li, Yifan Shi, Shanyong Wang
Summary: By grouting with a geotextile in an anchor support system, the strength of surrounding soils can be improved, leading to an increase in pull-out force of anchors. A series of filtration and penetration tests were conducted to investigate the improvement of surrounding soils, and microscopic tests were carried out to observe the soil structure before and after grouting. The main conclusions are: (1) The strength of surrounding soils is improved through compaction and slurry infiltration, but the improvement decreases with increased initial degree of compaction. (2) Increasing initial water content reduces the improvement in soil strength due to decreased compaction effect and cohesive substances infiltration, and the infiltrated water during grouting also negatively affects the soil strength improvement. (3) Grouting with a geotextile can improve soil strength regardless of soil type, especially for sandy soils, although the efficiency of slurry infiltration varies. (4) The filtration of geotextile forms a hardened layer at the grout-soil interface, which is beneficial for applications such as capsule-type anchors.
Article
Mining & Mineral Processing
Zhixiang Song, Junwen Zhang, Yang Zhang, Xukai Dong, Shanyong Wang
Summary: A three-stage triaxial loading and unloading stress path was designed and proposed to determine and evaluate the brittleness of deep bedded sandstone. Six brittleness indices were selected and analyzed based on the bedding effect and the effect of confining pressure. The entropy weight method was used to assign weight to the indices and a comprehensive brittleness index Bc was defined and evaluated. The proposed method offers reliable evaluations of the brittleness of deep bedded sandstone in deep engineering practices.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Geological
Lanting Wei, Qiang Xu, Shanyong Wang, Xu Ji
Summary: This paper investigates the influence of slip surface evolution on slope bearing capacity through laboratory model tests using the transparent soil technique. The shear band evolution under different weak planes, loading conditions, and slope geometries is presented and analyzed. The research shows that the morphology of slip surfaces is strongly related to slope bearing capacity, and factors like pre-existing weak planes, loading conditions, and slope geometry have a significant impact on the process of shear band evolution.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Energy & Fuels
Shangxin Feng, Shanyong Wang
Summary: This study aims to establish a theoretical Field Penetration Index (FPI) model for Tunnel Boring Machines (TBM) by analyzing the tool-rock interaction of disc cutters. Through comparison with the polycrystalline diamond compact (PDC) bit, it was found that they have similar rock breakage mechanisms and force equilibrium. Cutting tests on granite, marble, and limestone were conducted to determine the relationship between rotary torque and applied thrust. Based on the test results and tool-rock interaction features, a theoretical FPI model of the disc cutter was derived and verified using field TBM performance data.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2023)
Article
Computer Science, Interdisciplinary Applications
Xu Chang, Bofu Gu, Shuren Wang, Shanyong Wang
Summary: Difficulties encountered during installation of cast-in-place piles in deep water bare hard rock include the installment of steel casing and mud leakage during drilling. A novel CIP pile with double steel casings (CIPDSC) was proposed and compared with a CIP pile with one steel casing (CIPASC) through numerical study. The load-displacement curves of the CIPDSC were characterized by five points of debonding, yielding, and compressive yielding of the inner and outer steel casings.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Civil
Sakina Tamassoki, Nik Norsyahariati Nik Daud, Shanyong Wang, Mohammad Jawed Roshan
Summary: This research used coir fiber and activated carbon as additives and waste materials, and lime as a binder to improve the properties of two residual soils. The Finite Element Model (FEM) and random forest (RF) model were employed to predict the California Bearing Ratio (CBR) value, and the results showed that the combination of lime, activated carbon, and coir fiber significantly improved the CBR value in both soils.
TRANSPORTATION GEOTECHNICS
(2023)
Article
Engineering, Marine
Cong Zhang, Zhende Zhu, Lun Dai, Shanyong Wang, Chong Shi, Duan Zhu
Summary: The use of the heavy hammer compaction method improves the bearing characteristics of underwater rubble-mound foundations, ensuring safety and stability in port and coastal engineering projects. This study combines image-recognition technology, 3D laser scanning technology, discrete element numerical simulation, and field testing to analyze the effects of various factors on the bearing characteristics of rubble-mound foundations. The main conclusions are: (1) The load-settlement curve of the foundation has three stages: rapid growth, slow growth, and failure. (2) The ultimate bearing capacity of the foundation is positively correlated with vibration time and amplitude, while riprap particle size and foundation thickness have minimal effects. (3) Settlement increases with increasing compactness when adjusting vibration time, amplitude, and foundation thickness, while factors like riprap particle size, gradation, and vibration frequency have less significant effects on compactness and settlement.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Energy & Fuels
Yu Tang, Junsheng Yang, Shanyong Wang, Shaofeng Wang
Summary: In this study, relevant excavation parameters of Zagros, Kerman and Bazideraz tunnels were collected to evaluate rock cuttability. Regression analyses were carried out to develop two-dimensional and three-dimensional models. The results showed that the three-dimensional regression models had better prediction performance than the two-dimensional models. Furthermore, prediction models for uniaxial compressive strength and rock cuttability classification were established based on specific energy.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2023)
Article
Metallurgy & Metallurgical Engineering
Shi Xu-dong, Feng Guo-rui, Bai Jin-wen, Chun Zhu, Wang Shan-yong, Wang Kai, Cui Bo-qiang, Song Cheng
Summary: The failure patterns and load-AE-DIC response of coal-backfilling (CB) composite structures were investigated through Brazilian splitting tests. The numerical simulations showed that with an increase of interface angle, the failure shifted from Type I to Type I-II pattern, then turned into Type III, and finally became Type II pattern.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2023)
