Article
Engineering, Geological
Zaiyong Wang, Haojie Lian, Weiguo Liang, Pengfei Wu, Wenda Li, Yongjun Yu
Summary: This study investigates the physical, mechanical, and fracturing properties of three different types of rock (shale, sandstone, and coal), using three-point bending tests. Fracturing characteristics are further analyzed using acoustic emission (AE) and digital image correlation (DIC). The modified fracture mechanics (MFM) theory, which takes into account the length of the fracture process zone (FPZ), is proposed to accurately calculate fracture toughness. The experimental results reveal that coal exhibits more significant non-linear fracture behavior compared to sandstone and shale. The coal has the largest FPZ area, and the FPZ length-to-width ratios are 0.86, 1.96, and 1.93 for shale, sandstone, and coal, respectively. The FPZ length varies significantly, while the FPZ width remains stable across the three rock types. The MFM approach yields lower average fracture toughness values for shale, sandstone, and coal (1.019, 0.419, and 0.058 MPa x m0.5, respectively) compared to standard LEFM. Sandstone has the highest average fracture energy (236.55 J/m2), while coal has the lowest (42.99 J/m2). These findings provide a theoretical basis for the joint exploitation of shale gas, tight sandstone gas, and coalbed methane.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Computer Science, Interdisciplinary Applications
Siyu Wei, Yanyan Li, Gang Liu, Yanjun Shang, Zhi Zhou, Kun Li
Summary: This study investigates the fracturing mechanism in buckle folds using an improved FDEM modeling approach, finding that different fold geometries significantly influence the development of fractures, while the initiation and propagation of major fracture sets are closely related to the evolutionary history of the fold.
COMPUTERS & GEOSCIENCES
(2022)
Article
Mechanics
Chenxi Zhang, Diyuan Li, Jinyin Ma, Quanqi Zhu, Pingkuang Luo, Yuda Chen, Minggang Han
Summary: The influence of loading rate on the mode I fracture property of rocks has been extensively studied, but the rate-effect of dynamic mode II fracture is rarely reported. This study conducted a series of dynamic mode II fracture tests under a wide range of loading rates using the modified split Hopkinson pressure bar (SHPB) system. The results showed that the dynamic mode II fracture toughness increases with loading rate, and the fracture processes can be divided into multiple stages.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Multidisciplinary Sciences
Wei-Yao Guo, Wei Zhang, Cheng-Guo Zhang, Yang Chen
Summary: This paper presents an experimental study on the behavior of coal samples under tensile loadings to understand the failure mechanisms and interactions with coal characteristics. The study found that the loading process mainly consists of compaction, elastic, and post-peak dropping stages. Two types of deformation localisation and different phases of acoustic emission evolution were observed. During the subcritical failure stage, the acoustic emission counts showed a rapidly increasing and intermittent feature.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Physical
Xianqiang Wang, Duo Liu, Yao Zhang, Yubo Jiao
Summary: This study investigated the effects of different factors on the performance of UHPC notched beams, finding that the water-binder ratio and replacement ratio of GS have a positive impact on the work performance of UHPC, while the length of BF has a negative one. Additionally, the fracture characteristics of UHPC notched beams can be effectively characterized through the analysis of AE parameters.
Article
Geochemistry & Geophysics
Kai Wang, Jinwen Bai, Guorui Feng, Dawei Yin, Boqiang Cui, Xudong Shi, Xinyu Yang
Summary: In this study, impact tests were conducted on mortar-encased coal specimens using a split Hopkinson pressure bar system. The mechanical properties and failure behavior of the specimens under impact loading were investigated. Results show that the mortar-encased specimens have nonlinear deformation characteristics and the mortar has higher energy absorption rate compared to the coal. Increasing the thickness of the external mortar body improves the dynamic strength of the specimens.
Article
Geochemistry & Geophysics
Kai Wang, Jinwen Bai, Guorui Feng, Dawei Yin, Boqiang Cui, Xudong Shi, Xinyu Wang
Summary: This study investigated the mechanical properties and failure behavior of mortar-encased coal specimens under impact loading using a split Hopkinson pressure bar (SHPB) system. Results showed that mortar-encased specimens have nonlinear deformation characteristic, with mortar showing higher energy absorption rate compared to coal. Increasing the thickness of the external mortar body helps absorb more stress wave energy and enhance the dynamic strength of the specimens.
Article
Acoustics
Kun Zhang, Sen Zhang, Jianxi Ren, Man Wang, Shuai Jing, Weijun Zhang
Summary: In this paper, a rock dynamic and static triaxial mechanical test system is used to study the evolution law of acoustic emission (AE) b value of coal rock under varying frequencies of static and dynamic load. The results show that dynamic load disturbance accelerates the instability failure process of coal rock, while the average stress level/ultimate strain of coal rock correspondingly declines/rises with increasing dynamic load frequency. The overall AE b value is relatively low after dynamic load disturbance, and the decrease in b value is larger with higher dynamic load frequency. Additionally, the change rule of AE b value is closely related to the instability and failure process of coal rock.
SHOCK AND VIBRATION
(2023)
Article
Energy & Fuels
Song Yu, Quan Fangkai, Yuan Junhong
Summary: This study investigated the diffusion behaviors of CH4, CO2, N-2, H2O, and O-2 under different temperature and pressure conditions using molecular mechanics, Monte Carlo, and molecular dynamics methods. The results show that the self-diffusion and transport diffusion coefficients of different gases vary under different ensembles. The diffusion coefficient of water generally increases with temperature, while the diffusion activation energy increases with pressure.
Article
Construction & Building Technology
Qiangqiang Zheng, Ying Xu, Hao Hu, Jiawei Qian, Yan Ma, Xin Gao
Summary: This study used acoustic emission technology to monitor sandstone specimens during uniaxial loading, constructed a mechanical model to quantitatively describe rock damage, and performed velocity structure inversion using time-lapse double-difference tomography. The results show that sandstone mainly exhibits shear fracture under uniaxial load, with the characteristics of AE signals divided into shear fracture, tensile fracture, and shear fracture during loading process. The research provides insights for rock stability analysis, risk prediction, and non-destructive testing of rock masses in engineering.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Mechanics
A. Zafra, G. Alvarez, J. Belzunce, J. M. Alegre, C. Rodriguez
Summary: The study used laboratory heat treatments to obtain homogeneous coarse-grain tempered bainitic/martensitic microstructures for assessing the fracture behaviour in the presence of internal hydrogen in welds. The results showed that the hydrogen embrittlement experienced by the CGHAZs of both steels was considerably greater than in the base steels.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Chemistry, Multidisciplinary
Yawu Shao, Yonglu Suo, Jiang Xiao, Yuan Bai, Tao Yang, Siwei Fan
Summary: The dynamic evolution characteristics of fractures in coal and rock mass play a crucial role in analyzing the development of instability, gas diffusion, and dynamic disaster prediction. Experimental results show that damage to coal mass due to high-pressure oil diffusion is inversely correlated with the distance from the disaster source. Furthermore, in abandoned oil wells, as the coal mass gets closer to the disaster source, its mechanical performance diminishes, fracture volume increases, and oil and gas storage capacity improves.
APPLIED SCIENCES-BASEL
(2022)
Article
Geochemistry & Geophysics
Shuangwen Ma, Han Liang, Chen Cao
Summary: Acoustic emission (AE) is widely used in coal mechanics studies to analyze the influence of loading rate or water content changes on mechanical properties. Different strength coals exhibit varied deformation behaviors, with hard coal showing brittleness related to disasters like coal bursts, and soft coal displaying soft rock properties. This study examined the deformation patterns and AE characteristics of coal with different strengths, highlighting differences in bearing capacity, fracture distribution, and energy dissipation between hard and soft coal.
Article
Engineering, Multidisciplinary
Changhao Shan, Qiangling Yao, Shenggen Cao, Hongxin Xie, Qiang Xu, Chuangkai Zheng, Xiaoyu Chen
Summary: The micro-pore structure and fracture evolution characteristics of coal pillar dam samples with different pH values were comprehensively studied. It was found that strong acidic mine water had the highest degree of damage to the coal pillar, while strong alkaline mine water had a higher development degree of small-sized fractures. Moreover, the higher the acidity of the mine water, the greater the macro-orderliness of the crack system.
Article
Nanoscience & Nanotechnology
V. Bertolo, Q. Jiang, M. Terol Sanchez, T. Riemslag, C. L. Walters, J. Sietsma, V. Popovich
Summary: This study aims to investigate the relationship between microstructure and cleavage fracture in the heat affected zone (HAZ) of welded high strength structures. The results show that the CGHAZ has the lowest fracture toughness, with the main crack propagating along {100} and {110} planes. The junction structures and M-A constituents in ICCGHAZs are not preferred sites for crack growth.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Thermodynamics
Hao Wang, Enyuan Wang, Zhonghui Li
Summary: The prediction of gas emission is important for coal and gas outburst prevention. This study established a dynamic prediction model based on gas flow analysis and found that gas emission is positively correlated with gas pressure, driving speed, and permeability coefficient, while negatively correlated with coal mass compressive strength.
COMBUSTION SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Xiaofei Liu, Jifa Qian, Enyuan Wang, Zhenguo Zhang
Summary: This study investigated an integrated vortex ventilation and dust removal system for addressing dust pollution in coal mining operations. Both numerical simulation and field experiments demonstrated the system's effective dust control and removal capabilities, outperforming traditional ventilation methods.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2021)
Article
Mathematics, Interdisciplinary Applications
Junjun Feng, Enyuan Wang, Qisong Huang, Houcheng Ding, Long Dang
Summary: This study investigates the crack propagation and internal fracture process of coal under dynamic loading, revealing significant multifractal features. The multifractal feature is found to be closely related to the brittle fracture property of coal, indicating its feasibility in evaluating coal brittleness and predicting coal failure risk in underground coal mines.
FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY
(2021)
Article
Geosciences, Multidisciplinary
Qiming Zhang, Enyuan Wang, Xiaojun Feng, Chao Wang, Liming Qiu, Hao Wang
Summary: This paper proposes six new indices for evaluating rockburst risk in deep coal seam group and establishes a Comprehensive Index Method based on analytic hierarchy process. By analyzing actual coal mine cases, the new method is shown to be more accurate and reliable compared to traditional methods.
NATURAL RESOURCES RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Zhibo Zhang, Enyuan Wang, Xianan Liu, Yinghua Zhang, Shujie Li, Majid Khan, Yukun Gao
Summary: This study used advanced equipment to establish an experimental system to measure UTV in different directions during the compression process of coal and rock material. It found significant differences in UTV between axial and radial directions, and proposed a model to describe the quantitative relationship between UTV and external stress, as well as a stress inversion method based on UTV.
JOURNAL OF APPLIED GEOPHYSICS
(2021)
Article
Engineering, Geological
Yangyang Di, Enyuan Wang
Summary: This study proposed a method for identifying rock burst precursor FEMR signals based on a deep learning algorithm, utilizing bidirectional long short-term memory recurrent neural networks for intelligent early warning. The model can automatically recognize shock hazard precursor signals and provide accurate rock burst hazard early warning quickly without requiring manual intervention. This approach is significant for accurate rock burst monitoring and early warning.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Engineering, Geological
Dong Chen, En-yuan Wang, Nan Li
Summary: This study analyzed 103 micro-earthquakes related to fault structure and mining activities in the Laohutai coal mine to determine their source properties. The source properties and scales of micro-earthquakes in Laohutai coal mine were found to be different from those in Qianqiu coal mine and natural earthquakes. The results provide important insights for evaluating the properties and magnitude of microseismic source in coal mines.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2021)
Article
Engineering, Geological
Xiangguo Kong, Shugang Li, Enyuan Wang, Xu Wang, Yuxuan Zhou, Pengfei Ji, Haiqing Shuang, Shaorong Li, Zongyong Wei
Summary: The study investigated the failure process of gas-bearing coal in a complex mining environment, revealing the stress wave variations, stress-strain curves, and fracture evolution through experiments and numerical simulations. The experimental results validated the numerical simulation results, elucidating the formation of high stress areas and their impact on coal specimens.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2021)
Article
Geosciences, Multidisciplinary
Dong Chen, Nan Li, En-yuan Wang
Summary: A study was conducted to assess the reliability of hydraulic fracturing in a coal mine by analyzing the changing trends of micro-seismic events induced by high-pressure water, calculating source parameters using the Brune model, and comparing micro-earthquakes induced by hydraulic fracturing and mining. The results showed that most micro-earthquakes occur in the initial stage of water pressure increase during hydraulic fracturing, and the locations of micro-earthquakes can be used to evaluate the hydraulic fracturing effect. It was found that these micro-earthquakes are within a safe controllable range, indicating the reliability and safety of the hydraulic fracturing process in the Xieqiao coal mine.
NATURAL RESOURCES RESEARCH
(2021)
Article
Mechanics
Xiaoran Wang, Enyuan Wang, Xiaofei Liu, Xin Zhou
Summary: The study investigated the mechanical and temporal-spatial microcracking behaviors of fractured sandstones under different loading rates using acoustic emission monitoring. The results showed significant static loading rate effects on the mechanical, acoustic, and microcracking processes. Increasing loading rates led to a change in dominant failure modes of fractured sandstones.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Environmental
Bing Li, Enyuan Wang, Zheng Shang, Xiaofei Liu, Zhonghui Li, Baolin Li, Hao Wang, Yue Niu, Yue Song
Summary: Accurate and advanced early warning of coal and gas outburst is crucial for ensuring the safety of coal mining. The proposed new early warning model combines ARIMA and TBM to optimize warning time and improve process safety in tunneling operations.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Engineering, Mechanical
Xuelong Li, Shaojie Chen, Enyuan Wang, Zhonghui Li
Summary: This paper establishes an elastic-plastic-brittle mutation rockburst model for coal rock with structural surface, and researches the energy accumulation and dissipation mechanism during dynamic deformation and rupture to obtain the rockburst energy condition. Additionally, a volume element-region-system model of rockburst is established to explain the evolution process. The analysis of microseismic and electromagnetic radiation characteristics of coal rock provides a deeper understanding of the rockburst mechanism for accurate monitoring and early warning.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Environmental Sciences
Zhibo Zhang, Enyuan Wang, Xianan Liu, Majid Khan, Miao He, Yinghua Zhang
Summary: The accuracy of source location in acoustic monitoring is crucial for monitoring the stability of complex rock mass environments. Traditional methods using equivalent velocity may result in relatively large errors in complex rock mass environments. A new source location method based on Dijkstra's algorithm (SLMD) is proposed, which shows significantly higher accuracy than traditional methods, as demonstrated in laboratory experiments.
ENVIRONMENTAL EARTH SCIENCES
(2021)
Article
Engineering, Geological
Dong Chen, En-yuan Wang, Nan Li
Summary: This study investigated the source properties and focal mechanism of coal and sandstone specimen rupture under uniaxial loading through acoustic emission testing. The results showed differences in rupture morphology between sandstone and coal specimens, with both materials exhibiting behavior in good agreement with the Brune model under uniaxial loading.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2021)
Article
Engineering, Geological
V. Frid, E. Y. Wang, S. N. Mulev, D. X. Li
Summary: This technical note highlights the lack of a unified measurement methodology as a major obstacle to the progress of the Fracture induced ElectroMagnetic Radiation (FEMR) method for stress field assessment in underground conditions. It discusses the analysis of three FEMR parameters in relation to micro-crack dimensions and rock elastic properties, as well as the consideration of two seismic acoustic parameters for FEMR application in underground. The note proposes the inclusion of specific parameters in future FEMR measurement protocols for the successful design of FEMR instruments to assess stress state near mine workings.
GEOTECHNICAL AND GEOLOGICAL ENGINEERING
(2021)
Article
Engineering, Mechanical
Zhuang Sun, Yixin Zhao, Yirui Gao, Sen Gao, Davide Elmo, Xindong Wei
Summary: In this study, the modified semi-circular bending test was used to investigate the fracture toughness of coal samples with different sizes and bedding angles. The results showed that the fracture toughness of coal exhibits size effect and anisotropy. The crack initiation and propagation in hydraulic fracturing of coal seam can be influenced by bedding angles.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Ruiming Zhang, Kai Ma, Wenzhu Peng, Jinyang Zheng
Summary: The fatigue crack growth rates of 4130X steel in different hydrogen concentrations were measured, and the influence of hydrogen on crack behavior was analyzed. Results show that the crack growth rate increases with increasing hydrogen pressure, reaching a threshold at 87.5 MPa.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Hien Do, Phuc L. H. Ho, Canh V. Le, H. Nguyen-Xuan
Summary: In this study, a new method for determining the limit loads of fracture structures using the pseudo-lower bound method with adaptive quadtree meshes is proposed. The method overcomes the volumetric locking problem and handles the challenge of hanging nodes during refinement procedure by using quadtree meshes. The effectiveness of the approach is demonstrated through numerical validation.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Weimin Song, Yuxin Fan, Hao Wu, Liang Zhou
Summary: This study proposed a novel test method to characterize the I-II mixed fracture toughness of asphalt pavement and investigated the effects of reclaimed asphalt pavement (RAP) and loading rate. The results showed that loading rate and inclusion of RAP had positive effects on fracture toughness.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Zida Liu, Diyuan Li, Jianqiang Xia, Quanqi Zhu
Summary: In this study, the influence of flaw inclinations on the failure mechanism of fissured granite specimens was analyzed through a series of experiments. A quantitative method combining deep learning and scanning electron microscope was employed to identify the mesoscopic fracture mechanism of macroscopic cracks. The results indicated that the failure of fissured specimens was mainly caused by tensile stress and shear stress.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Jiabing Zhang, Yiling Chen, Ronghuan Du, Xianglian Zhao, Jun Wu
Summary: This study investigated the mechanical characteristics and crack propagation behavior of sandstone-like samples with single cracks under freeze-thaw cycles. The results demonstrated the significant effects of crack angle and freeze-thaw cycles on the compressive strength and stability of the samples. Confining pressure inhibited the freeze-thaw deterioration, and the acoustic emission signals exhibited good consistency with the stress-strain curves. The simulation results matched well with the experimental results, and five crack propagation modes were proposed.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Felix Boedeker, Pauline Herr, Anders Biel, Ramin Moshfegh, Stephan Marzi
Summary: Cohesive Zone Models with finite thickness are widely used for fracture mechanical modeling. Computational homogenization techniques are crucial for the development of advanced engineering materials. FFT-based homogenization scheme shows potential in reducing computational effort and has practical applications.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Sobhan Pattajoshi, Sonalisa Ray, Yugal Kishor Joshi
Summary: In this work, a novel multi-layer composite structure is proposed for protective shelter design. The dynamic behavior and mechanical performance of the multi-layer composite under projectile impact loading are investigated. The proposed composite target demonstrates enhanced penetration resistance and lesser damage compared to its reinforced concrete monolayer counterpart. An analytical model is also developed to predict the forces transmitted to the lowest layer for design purposes.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
H. M. Shodja, M. T. Kamali, B. Shokrolahi-Zadeh
Summary: This study proposes a semi-analytical method for calculating the stress intensity factor of an internally pressurized eccentric annular crack. By using hypersingular integral equations and conformal mapping, accurate values of SIFs along the crack edges can be obtained. The material properties of the elastic matrix do not affect the SIF values, as demonstrated through the investigation of geometric parameters.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Wen Hua, Zhanyuan Zhu, Wenyu Zhang, Jianxiong Li, Jiuzhou Huang, Shiming Dong
Summary: Accurate assessment and prediction of fracture behavior in cracked materials using mixed mode fracture criteria are crucial in fracture mechanics. This study comprehensively reviewed modified fracture criteria that incorporate T-stress for mixed mode I-II cracks. A comparative analysis was conducted between experimental results and theoretical predictions for five different cracked configurations. The study also discussed the effect of T-stress on crack initiation angle and fracture toughness, providing suggestions. The results showed variations in predictive accuracy across different cracked configurations due to disparities in T-stress. However, similar predictions were observed for semi-circular bend and edge-crack triangular specimens due to their similar biaxial stress ratio B. Different fracture criteria were suitable for different cracked configurations with positive or negative T-stresses.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Qing-qing Shen, Qiu-hua Rao, Wei Yi, Dian-yi Huang
Summary: This study proposes a theoretical approach to forecast multi-crack propagation trajectories in a finite plate. By calculating the stress intensity factor (SIF) and analyzing the influence of crack size, the criteria for crack initiation and propagation in a finite plate are established. Experimental results demonstrate that the SIF of multiple cracks in a finite plate is consistently larger than that of an infinite plate.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Songbai Li, Qiyun Zhu, Zhizhong Lu, Hongzhi Yan, Chu Zhu, Peize Li
Summary: This study investigates the effects of laser heating and laser shot peening on fatigue life of AA2524, and predicts the fatigue life using artificial neural networks and support vector regression models. The results show that laser heating and laser shot peening can significantly improve the fatigue life, and the neural networks have better prediction ability.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
V. Shlyannikov, A. Sulamanidze, D. Kosov
Summary: This paper presents experimental crack-growth data for thermomechanical fatigue conditions in nickel-based alloy components. The crack-growth experimental results are interpreted using finite element analyses and multi-physics numerical calculations. The results show that crack growth rate is slower under isothermal pure fatigue conditions, while it is faster under thermomechanical cyclic deformation conditions.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Tairui Zhang, Xin Ma, Bin Yang, Wenchun Jiang, Zhiqiang Ge, Xiaochao Liu
Summary: This study experimentally investigated the fracture toughness distributions in dissimilar metal welds. The predictions of fracture toughness were made using three criteria and an energy release rate model. The results showed that using the critical strain criterion and ERR model resulted in higher consistency compared to mini-CTs, while the predictions using the critical stress criterion had high dispersion. The study also investigated the source of errors through damage developments and SEM observations.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Yike Dang, Zheng Yang, Xiaoyu Liu, Jianghao Guo
Summary: This study uses discrete element modeling to examine bedded rock failure with parallel defects. It is found that bedding influences crack propagation direction but has limited impact on final failure. Shear failure accumulates at the bridge area and defect tip, while tensile failure occurs during nucleation region development.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)