Article
Engineering, Geological
Yang Ye, Changdong Li, Yawu Zeng, Huiming Tang
Summary: This study conducted three-dimensional discrete element method simulations to investigate the impact-induced breakage of brittle rock blocks with different shapes. The results showed that the elongation ratio and flatness ratio significantly influenced the breakage behavior. Three fracture mechanisms, namely fragmentation, horizontal tensile fracture, and vertical tensile fracture, were identified. Fragmentation resulted in numerous high-velocity fragments, while higher elongation or flatness ratios suppressed the fragmentation phenomenon.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2023)
Article
Engineering, Geological
Che-Ming Yang, Chung-Hsun Lee, Chun-Yuan Liu, Wei-Kai Huang, Meng-Chia Weng, Yu-Yao Fu
Summary: This study investigates a destructive rockfall event in northern Taiwan and analyzes its impact using investigations, numerical simulations, and scenario modeling. The study proposes a method for analyzing the impact of rockfall on retaining structures.
Article
Engineering, Environmental
Ashok K. Singh, J. Kundu, K. Sarkar, H. K. Verma, P. K. Singh
Summary: This study highlights the impact of rock block characteristics on rockfall hazard and the design of mitigative measures. It emphasizes the significance of block initiation zones in determining various factors such as bounce height, kinetic energy, run-out distance, and impact down the slope. The study suggests that considering the kinetic energies of specific block size range along with initiation zones can enhance the effectiveness of rockfall protection measures.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Chemistry, Multidisciplinary
Thomas Strauhal, Christian Zangerl
Summary: This study presents stochastic analyses of the in situ block area distribution and mean block area of non-persistent fracture networks, highlighting the impact of intact rock bridge failure. It discusses an empirical relationship between block area for persistent and non-persistent fractures, as well as the mean interconnectivity factor. Additionally, the potential adaptation of the 2D approach to 3D block geometries is explored for rock mass characterization.
APPLIED SCIENCES-BASEL
(2021)
Article
Computer Science, Interdisciplinary Applications
Li Ge Wang, Ruihuan Ge, Xizhong Chen
Summary: This paper aims to establish a breakage master curve of oblique impact using a DEM bonded contact model. It addresses two major issues in hindering the predictive capacity of DEM: the discrepancy of breakage probability evaluation and the lack of an oblique impact model. The study conducts digital twin of impact breakage using a DEM bonded contact model and proposes a new oblique impact model. The equivalent velocity in the oblique impact model successfully establishes a remarkable breakage master curve for all impact angles.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Chemical
Saprativ Basu, Arijit Chakrabarty, Samik Nag, Pradeep Chaudhary, Surajit Sinha, Thrilok Jain, Mohan S. Nainegali, Victor A. Rodriguez, Luis Marcelo Tavares
Summary: Tata Steel deals with millions of tons of sinter for ironmaking annually. Currently, a large amount of the produced sinter turns into fines during handling and needs to be recycled. This research focuses on the calibration and validation of a breakage model using the Discrete Element Method (DEM) in both laboratory and industrial chute systems, demonstrating the value of DEM in predicting flow, breakage, and fines generation during sinter handling.
Article
Mathematics, Interdisciplinary Applications
Alan A. de Arruda Tino, Luis Marcelo Tavares
Summary: Several tests are commonly used in the mining and aggregate industries to analyze the resistance of rocks and ores to breakage, providing basis for mathematical expressions or models. This study shows that simulations using the discrete element method with polyhedral particles can predict outcomes of three specific tests, with sensitivity analysis recommending optimal values for the drop weight test. The validity of the breakage model and its ability to describe test outcomes for brittle particulate materials are demonstrated.
COMPUTATIONAL PARTICLE MECHANICS
(2022)
Article
Engineering, Geological
Terry Y. P. Yuen, Meng -Chia Weng, Yu-Yao Fu, Guan-Ting Lu, Wen-Jie Shiu, Cheng-An Lu, Chun -Yuan Liu, Chia -Chi Chiu, Tzu-Han Wen
Summary: Two destructive rockfalls occurred in central Taiwan, severely damaging an essential bridge of a mountain expressway. Field investigations were conducted to recognize the trajectories of the rockfalls and gather information on the falling blocks and bridge damage. A hybrid model of the discrete element method (DEM) and finite element method (FEM) was developed based on the obtained field data to assess the rockfall impact on the bridge.
ENGINEERING GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Hongzhi Qiu, Jintao Yuan, Peifeng Han, Miao Yang, Wenyao Huang, Xu Fang, Yuxin Li
Summary: In this paper, numerical simulations were carried out to study the interaction between rockfalls and soil cushion layers. The buffer performance of different mixed material buffer layers was investigated by analyzing the pressure of the bottom plate. The force chain propagation process and energy propagation process were also studied.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Engineering, Environmental
Qing Yu, Xiaohong He, Haoyu Miao, Minghua Lin, Kaixiang Zhang, Rui Guo
Summary: This study applied the MatDEM software to simulate and analyze the rock breaking mechanism of disc cutter in soil-rock formations. The results showed that the rock breaking effect of the disc cutter is related to the contact area between the rock and blade, the volume of broken rock, and the angle of contact area.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Engineering, Geological
Davide Ettore Guccione, Olivier Buzzi, Klaus Thoeni, Stephen Fityus, Anna Giacomini
Summary: The paper presents a theoretical model that can predict the fragmentation survival probability of brittle spherical blocks upon dynamic impact, based on the statistical distribution of material properties determined from standard quasi-static tests. The model focuses on predicting Weibull parameters and mechanistic conversion factors to estimate the critical kinetic energy for failure of spheres at impact. Three series of drop tests were conducted to validate the novel predictive model, showing that it is possible to predict the survival probability of artificial rock of different diameters solely from statistical information with low error rates.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Thermodynamics
Cun-Guang Liang, Ze-Shi Guo, Xiu Yue, Hui Li, Peng-Cheng Ma
Summary: Microwave-assisted breakage of rock is widely used in mining and geotechnical engineering, but the mechanism of rock breakage is not clearly understood due to complex multiphysics coupling. To study the behavior of basalt rock under microwave irradiation, a coupled electromagnetic-thermal-mechanical mathematical model was established to analyze the heating process and explain the breakage mechanism. The results showed that an inhomogeneous electric field distribution in the cavity and basalt rock led to a temperature gradient in the sample, resulting in fracture or blast. The study provides scientific guidelines for the application of microwave-assisted breakage of rock.
Article
Engineering, Geological
Jinguang Li, Yu Liu, Linwei Wang, Yumeng Sun, Xin Li, Junjie Wang
Summary: This paper establishes a mathematical model to determine the influencing factors of the penetration coefficient and uses the discrete element method to simulate the variation of the penetration coefficient during the rock drilling process. The effects of different operational parameters on the penetration coefficient are also evaluated.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Geosciences, Multidisciplinary
Weigang Shen, Tao Zhao, Feng Dai
Summary: This study investigates the influence of particle size on the buffering efficiency of a soil cushion layer through experimental and numerical tests. It is found that particle size can significantly affect the impact force, especially in high-velocity impacts. These findings offer insights for designing effective soil cushion layers for protection structures.
Article
Engineering, Chemical
Yannick Descantes
Summary: A new molecular dynamics-like modelling approach is presented for simulating the mechanical behaviour of dense assemblies of true polyhedra. This approach utilizes an improved contact detection algorithm and solves torque equations efficiently without the need for periodic renormalization. The potential of this approach is demonstrated through simulations of gravity packing and gravity flow, showing agreement with literature results. The method shows promise in capturing the behavior of polyhedra in different flow regimes.
Article
Engineering, Civil
Lei Jin, Yawu Zeng, Jingjing Li, Hanqing Sun
Summary: Based on the virtual slicing technique, random pore-structural models of soil-rock mixtures were constructed and simulated using the discrete element method and three-dimensional lattice Boltzmann method. The study found that the permeability of soil-rock mixtures decreases significantly with increasing rock content, but increases with increasing rock size. Additionally, rock shape and orientation also influence the permeability, with different effects observed for different rock shapes.
PERIODICA POLYTECHNICA-CIVIL ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Yang Ye, Yawu Zeng, Hanqing Sun, Yang Liu, Xi Chen, Wunjun Ma
Summary: The study revealed the influence of particle size, lateral contact force, and coordination number on contact behavior and particle breakage through compression tests.
Article
Engineering, Chemical
Yang Ye, Yawu Zeng, Hanqing Sun, Xi Chen, Shufan Cheng, Wenjun Ma
Summary: Improved knowledge of cyclic contact behaviour of brittle particle can be obtained through cyclic compression tests and elastoplastic contact theory. The study reveals significant differences in cyclic contact behaviour between the first cycle and subsequent cycles, and proposes modified contact models to accurately reproduce experimental results. The semi-theoretical cyclic contact model shows good agreement with the main characteristics of cyclic contact behaviour.
Article
Engineering, Geological
Xi Chen, Yawu Zeng, Yang Ye, Hanqing Sun, Zhicheng Tang, Xiaobo Zhang
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Computer Science, Interdisciplinary Applications
Yang Ye, Jianwu Ma, Zhijun Wu, Yawu Zeng
Summary: A novel three-dimensional finite-discrete element method (3D-FDEM) was proposed to capture the crack closure behavior and high UCS/TS ratio in highly fractured rocks. The results show that crack intensity and width significantly influence the occurrence of the crack closure stage and the evolution process of tangent modulus. The method can capture the evolution trends of tangent modulus of various rock materials through a combination of stiffness degradation and failure of cohesive elements and initial microcrack closure.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Engineering, Geological
Yang Ye, Yawu Zeng, Shufan Cheng, Xi Chen, Hanqing Sun
Summary: In this study, a numerical method combining the notional surface method and flat-joint model was proposed to simulate crack-closure behavior in three-dimensional rock samples. The method allows for the insertion of pre-existing microcracks and captures various trends in the evolution of the crack-closure stage. The results showed that crack intensity and width significantly affect crack-closure behavior, and a calibration procedure was developed to match the mechanical parameters and crack-closure behavior of sandstone.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2022)
Article
Engineering, Geological
Yang Ye, Yawu Zeng, Hanqing Sun, Wenjun Ma, Xi Chen, Zhixiong Peng
Summary: This study investigated the fracture types and displacement changes of marble spheres through cyclic compression tests and scanning electron microscopy (SEM) imaging measurements. The results showed that the displacement in cyclic compression tests can be larger than that in monotonic compression tests, and mineral fragmentation, plastic shear sliding, and crack closure caused obvious residual displacement. Hertzian cracks were produced due to densification and shear strength degradation under cyclic loading, and the amplitude and cyclic loading frequency influenced the failure times and dynamic secant stiffness of marble spheres.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Engineering, Geological
H. Zhang, S. Chen, L. Wang, S. Cheng
Summary: This study applies an improved Harris distribution function to describe the heterogeneity and randomness of rock material and micro-unit damage. A new damage constitutive model is established and validated through triaxial compression tests.
SOIL MECHANICS AND FOUNDATION ENGINEERING
(2022)
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)