Article
Geosciences, Multidisciplinary
Yun Zheng, Runqing Wang, Congxin Chen, Fei Meng
Summary: This study utilized the UDEC numerical method to analyze the mechanism of flexural toppling failure and introduced new parameters to further understand the process. The results revealed that the failure zone of rock slopes includes a first-order instability part and an independent toppling zone, with surface deformation discontinuities being a precursor to flexural toppling failure.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Engineering, Multidisciplinary
Q. G. Liu, C. M. Fan, B. Sarler
Summary: The paper introduces a Localized Method of Fundamental Solutions (LMFS) for solving two-dimensional anisotropic elasticity problems by dividing the computational domain into overlapping subdomains and combining the classical Method of Fundamental Solutions (MFS) to achieve expression and calculation of the solution.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2021)
Article
Engineering, Geological
Pedro Pazzoto Cacciari, Marcos Massao Futai
Summary: This paper proposes a new method to obtain the P-32 of rock masses from 2D rock exposures, based on well-known weighted joint density (wJd) and mean trace length (mu(1)) estimates. The method was developed and validated using DFN modeling and compared with P-32 estimates obtained by computational simulations. The results demonstrate that the proposed method is reliable and can estimate the P-32 of rock masses without requiring computation simulations. Moreover, the study investigates the effects of discontinuity density and size on the mechanical behavior of rock masses.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Mathematics, Applied
Xiaoguang Yuan, Quan Jiang, Zhidong Zhou, Fengpeng Yang
Summary: This paper extends the method of fundamental solutions (MFS) for solving the boundary value problems (BVPs) of analytic functions. The conformal mapping technique is applied to introduce singularities and reconstruct the fundamental solutions. The proposed method has the advantages of conciseness, reliability, efficiency, high accuracy, and easy-using.
Article
Computer Science, Interdisciplinary Applications
Ziyuan Cong, Yuwei Li, Yu Liu, Yonghui Xiao
Summary: This study proposed a stress numerical search method based on the maximum circumferential stress criterion to predict the fracture propagation angle in hydraulic fracturing. The method was found to be more consistent with real conditions and could be used to predict fracture propagation trajectories with different rock and construction parameters.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Engineering, Environmental
Ning Tang, Linfeng Wang, Hui Jiang, Xiaoming Huang, Guojin Tan, Xin Zhou
Summary: In this study, a modified K-means clustering algorithm based on genetic algorithm and simulated annealing algorithm was proposed for the identification of rock discontinuities. The algorithm overcomes the shortcomings of traditional K-means algorithm and achieves global optimization. The introduction of a new similarity measurement and validity indices improves the objectivity and accuracy of the clustering results. The experimental results demonstrate the effectiveness of the proposed method on both synthetic and real data.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Mechanics
Xiaoran Wang, Pouyan Asem, Chen Hu, Joseph F. Labuz
Summary: Acoustic emission and digital image correlation were used to monitor mode I fracture, revealing local mixed-mode dominance due to oblique microcrack planes within a tortuous fracture. Mechanisms in the global coordinate system mainly indicated mode I opening.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Geological
L. J. Wang, L. F. Fan, X. L. Du
Summary: The propagation properties of stress waves in rock masses are crucial for studying the internal structure of the Earth and earthquake disasters. This study investigated the non-attenuation behavior of stress wave propagation through rock masses with different wave impedance using the modified displacement discontinuity method.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Engineering, Geological
Dongya Han, Hui Yang
Summary: The study experimentally investigated the effects of tensile stresses on wave behaviors across single natural rock joints, showing that increasing tensile stress decreases transmission coefficient and spectral amplitudes for ultrasonic waves. The wave velocity is also reduced under tension, and ultrasonic wave properties of single rock joints under tension can be well described by the displacement discontinuity model (DDM). Additionally, the specific stiffness of joints decreases with increasing tensile stress.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Engineering, Geological
Meiyu Li, Guowei Ma, Tuo Li, Yun Chen, Huidong Wang
Summary: In this study, an equivalent discontinuum analysis (EDA) method is proposed to deal with complexly fractured rock masses, which effectively maintains stress variability and displacement discontinuity while improving computational efficiency.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Engineering, Environmental
Amir Mohamadi, Mahmoud Behnia, Mahmoud Alneasan
Summary: The study focuses on determining crustal stress using hydraulic fracturing and fracture mechanics methods, finding that stress magnitudes calculated by fracture mechanics approach are greater than those by classical methods. The research also investigates the impact of crack inclination angle and length on stress magnitudes, and analyzes the distribution of fluid pressure along cracks and its influence on stress intensity factor in crack tips.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Engineering, Geological
Feili Wang, Kaiwen Xia, Wei Yao, Shuhong Wang, Chonglang Wang, Zhanguo Xiu
Summary: This study presents an experimental method to simulate slip shear failure along rock discontinuities, conducted by dynamic direct shear experiments using a dynamic shear apparatus combined with a high-speed digital camera. The effects of shear velocity and normal stress on rough rock discontinuities are analyzed, revealing that slip rate is linearly proportional to shear velocity and decreases with increasing normal stress. A dynamic failure criterion is developed considering both surface roughness and dynamic loading, providing a good prediction of the experimental data on the dynamic shear process of rock discontinuities.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Engineering, Multidisciplinary
Louis Ngai Yuen Wong, Xin Cui
Summary: Underground engineering has become increasingly sophisticated in recent years, with studies on DDM and FSM simulations of fractures and openings being rare due to limited access to corresponding programs. This study introduces DDFS3D, the first open-source code for 3D DDM-FSM implementation, aiming to promote its application in underground engineering.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2021)
Article
Computer Science, Interdisciplinary Applications
Yiguo Xue, Xudong Jiang, Fanmeng Kong, Zhiqiang Li, Huimin Gong, Fan Yang, Hong Chen
Summary: This study explores the characteristics of rock fragmentation in blasting scenarios for jointed rock mass of underground space by creating bonded particle models with discontinuities. The study found that different types of discontinuities have different effects on crack propagation and rock fragmentation.
SIMULATION MODELLING PRACTICE AND THEORY
(2022)
Article
Environmental Sciences
Xiang Wu, Fengyan Wang, Mingchang Wang, Xuqing Zhang, Qing Wang, Shuo Zhang
Summary: A new method for automatically extracting discontinuity information from 3D point clouds on the surface of rock masses is proposed in this paper. Experimental results demonstrate that the new method has higher precision and reliability compared to traditional approaches.
Article
Engineering, Geological
Abolfazl Abdollahipour, Mohammad Fatehi Marji, Alireza Yarahmadi Bafghi, Javad Gholamnejad
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2015)
Article
Metallurgy & Metallurgical Engineering
Nooraddin Nikadat, Mohammad Fatehi, Abolfazl Abdollahipour
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2015)
Article
Materials Science, Multidisciplinary
Abolfazl Abdollahipour, Mohammad Fatehi Marji, Alireza Yarahmadi Bafghi, Javad Gholamnejad
INTERNATIONAL JOURNAL OF FRACTURE
(2016)
Article
Metallurgy & Metallurgical Engineering
Abolfazl Abdollahipour, Mohammad Fatehi Marji, Alireza Yarahmadi Bafghi, Javad Gholamnejad
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2016)
Article
Energy & Fuels
Hatef Yousefian, Hamid Soltanian, Mohammad Fatehi Marji, Abolfazl Abdollahipour, Yaser Pourmazaheri
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2018)
Article
Engineering, Geological
Meysam Lak, Mohammad Fatehi Marji, Alireza Yarahmadi Bafghi, Abolfazl Abdollahipour
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2019)
Article
Metallurgy & Metallurgical Engineering
Abolfazl Abdollahipour, Hamid Soltanian, Yaser Pourmazaheri, Ezzatollah Kazemzadeh, Mohammad Fatehi-Marji
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2019)
Article
Energy & Fuels
Meysam Lak, Mohammad Fatehi Marji, Alireza Yarahmadi Bafghi, Abolfazl Abdollahipour
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2019)
Article
Mechanics
Rezvan Alizadeh, Mohammad Fatehi Marji, Abolfazl Abdollahipour, Mehdi Pourghasemi Sagand
Summary: The 2D displacement discontinuity method is an indirect boundary element technique for fatigue crack growth analysis, expressing stresses and displacements through displacement discontinuities. By extending DDM using cubic variations of displacement discontinuity and an algorithm based on linear elastic fracture mechanics principle, crack growth under cyclic fatigue loading can be analyzed accurately. The method involves an iterative process adding incremental elements at the crack tip until failure criteria are reached, enabling fatigue modeling of structures with multiple cracks and different growth rates.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Geological
Rezvan Alizadeh, Mohammad Fatehi Marji, Abolfazl Abdollahipour, Mehdi Pourghasemi Sagand
Summary: This study presents a numerical model for analyzing fatigue in heterogeneous brittle geomaterials using the 2D boundary element method and linear elastic fracture mechanics. The model considers materials with different properties and completely bonded interfaces, as well as multiple cracks exposed to cyclic loads. The stress intensity factor is determined using the displacement field around crack tips, and an incremental crack growth scheme is applied for fatigue life estimation. The accuracy of the method is demonstrated through the examination of various structures under different cyclic loads.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Mining & Mineral Processing
A. Abdollahipour, M. Fatehi-Marji, H. Soltanian, E. A. Kazemzadeh
JOURNAL OF MINING AND ENVIRONMENT
(2018)
Article
Engineering, Geological
Abolfazl Abdollahipour, Mohammad Fatehi Marji
GEOTECHNICAL AND GEOLOGICAL ENGINEERING
(2017)
Article
Mining & Mineral Processing
Abdollahipour Abolfazl, Fatehi Marji Mohammad, Yarahmadi Bafghi Alireza, Gholamnejad Javad
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2016)
Article
Mining & Mineral Processing
A. Abdollahipour, M. Fatehi Marji, A. R. Yarahmadi Bafghi, J. Gholamnejad
JOURNAL OF MINING AND ENVIRONMENT
(2016)
Article
Computer Science, Interdisciplinary Applications
Yinghao Deng, Yang Xia, Di Wang, Yan Jin
Summary: This study investigates the mechanism of hydraulic fracture propagation in laminated shale, develops a numerical solver, and validates the effectiveness of the method through simulation experiments. The study also examines the influence of the interaction between hydraulic fractures and weak interfaces on the mechanical properties of shale.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Zhichao Zhang, Mingfei Feng, Guangshuo Zhou, Zhenglong Xu
Summary: A thermodynamic constitutive model for structured and destructured clays is proposed in this paper. The model includes state-dependent relations of hyperelasticity and plasticity without the concept of yielding surface. The proposed model captures the couplings between elasticity and plasticity and the effects of bonding structure.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Deze Yang, Xihua Chu
Summary: Creep and stress relaxation behaviors in granular materials are influenced by the time-dependent changes in their microstructure, with particle shape playing a significant role. However, the effects of particle shape on these behaviors are still not well understood. In this study, 3D DEM models incorporating the rate process theory and superellipsoids are used to simulate creep and stress relaxation in granular samples with different aspect ratios and blockiness. The results show that both aspect ratio and blockiness have a significant influence on creep and stress relaxation, with aspect ratio affecting creep through contact force ratio and blockiness affecting stress relaxation through variation in normal contact force anisotropy. These findings provide insights into the effects of particle shape on creep and stress relaxation in granular assemblies.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Shahab Amanat, Kourosh Gholami, Reza Rafiee-Dehkharghani, Dipanshu Bansal
Summary: This paper investigates the optimal design of wave barriers using the modified non-dominated sorting genetic algorithm-II (NSGA-II) and the Bloch-Floquet theory. The aim is to find the optimal design of plane wave barriers with a wide bandgap at a low-frequency range and low construction cost. The study develops a modified NSGA-II algorithm to determine the optimal arrangement of concrete in wave barrier unit cells. The performance of the optimal barriers is examined through finite element simulation and their efficacy in attenuating plane S-waves is verified.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Yanlin Su, Guoqing Cai, Fengjie Yin, Yepeng Shan, Annan Zhou
Summary: This paper presents a novel elastic-viscoplastic constitutive model that takes into account particle breakage to reproduce the time-dependent behavior of coarse-grained soil. The model integrates the Unified Hardening (UH) model, the elastic-viscoplastic (EVP) model, and the overstress theory. The relationship between particle breakage and loading rate is established, and state variables associated with the critical state of coarse-grained soil are derived to consider both time and particle breakage. A three-dimensional elastic-viscoplastic constitutive model is constructed by combining a one-dimensional viscoplastic hardening parameter with a secondary consolidation coefficient considering particle breakage. The proposed model requires 19 parameters and effectively describes the influence of time-dependency and particle breakage on the shear, dilatancy, and compression behaviors of coarse-grained soil with different confining pressures or initial void ratios. Experimental data comparisons validate the model's ability to replicate the time-dependent behavior of coarse-grained soil.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Shichao Zhang, Yaqiong Wang, Qidong Gao, Xiaobo Ma, Haixiao Zhou, Zhifeng Wang
Summary: Accurately evaluating and predicting ground settlement during tunnel excavation is essential for ensuring tunnel stability. This study conducted a probabilistic analysis of ground settlement under uncertain soil properties. The results demonstrate that spatially variable soils significantly influence the ground settlement in the vertical direction.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Xu Zhang, Bin Luo, Youjun Xu, Zhiwen Yang
Summary: This paper presents an analytical solution for horizontal displacements induced by small radius curve shield tunneling. The formula is derived based on the image method and Mindlin solution, considering additional thrust, frictional resistance, ground loss, and grouting pressure. The solution is validated with on-site data, demonstrating its reliability and providing a new approach for predicting and controlling stratum horizontal displacements in curve shield tunneling. The study finds that ground loss has the most significant influence on displacements, and soil closer to the tunnel exhibits larger horizontal displacements.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Jian-Hong Wan, Ali Zaoui
Summary: Ground vibrations during earthquakes can cause soil strength loss and structural damage. Rubber-soil mixtures (RSM) have shown promise in reducing residual ground deformation. This study used molecular dynamics simulations to investigate the friction behavior of the rubber-clay interface in RSM systems. The results revealed a direct correlation between normal stress and friction force, with denser soil systems exhibiting higher friction forces.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Hongying Wang, Qiang Zhang, Peinan Wu, Yanjing Li, Lijun Han, Guilei Han
Summary: In addition to the Mohr-Coulomb and Hoek-Brown criteria, other nonlinear functions are used to describe the plastic response of rock mass. This paper derived the equivalent cohesive strength, frictional angle, and dilatancy angle for nonlinear yield and plastic flow rock masses. The solution for a circular tunnel in any nonlinear yield and plastic flow rock masses was derived and verified using a numerical procedure. The analysis of strain-softening rock masses under two assumed nonlinear yield criteria was also studied.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Zhijun Wu, You Wu, Lei Weng, Mengyi Li, Zhiyang Wang, Zhaofei Chu
Summary: This study proposed a machine learning approach to predict the uniaxial compression strength (UCS) and elastic modulus (E) of rocks. By measuring meso-mechanical parameters and developing grain-based models, a database with 225 groups of data was established for prediction models. The optimized kernel ridge regression (KRR) and gaussian process regression (GPR) models achieved excellent performance in predicting UCS and E.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Mingjun Zhou, Zhenming Shi, Chong Peng, Ming Peng, Kahlil Fredrick E. Cui, Bo Li, Limin Zhang, Gordon G. D. Zhou
Summary: In this paper, the erosion and deposition processes during overtopping dam breaching are simulated using a novel method (ED-SPH). The proposed model is able to capture the complex behaviors of dam soil erosion, entrainment, and depositions. Soil deposition hinders particle movement and reduces water velocity at the water-soil interface.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
C. Chavez-Negrete, F. J. Dominguez-Mota, R. Roman-Gutierrez
Summary: To accurately simulate groundwater flow in porous layered media, it is important to consider all environmental factors and use a generalized finite differences scheme as a meshless method for spatial discretization. This approach ensures robustness and accuracy of the numerical solution.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Shuairun Zhu, Lulu Zhang, Lizhou Wu, Lin Tan, Haolong Chen
Summary: This paper investigates the effectiveness of the cascadic multigrid method applied to the improved Picard iteration method for solving nonlinear problems in deforming variably saturated porous media. Two improved Picard iteration methods are proposed, and their effectiveness is verified through numerical examples. The results show that the improved methods have faster convergence and higher computational efficiency compared to the classical method.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Yuan Cao, Yan-Guo Zhou, Kyohei Ueda, Yun-Min Chen
Summary: Investigated shear stress responses of enclosed soil in deep soil mixing (DSM) grid-improved ground, and revealed the characteristics of the waist effect and mathematical model for shear stress reduction ratio.
COMPUTERS AND GEOTECHNICS
(2024)
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)
