Article
Engineering, Civil
Xunjian Hu, Xiaonan Gong, Junjie Ma, Panpan Guo, Haibo Hu
Summary: A linear parallel bond model combined with Weibull distribution is used to investigate the cracking behavior and stress evolution of rocks containing three parallel flaws under uniaxial compression. The presence of flaws weakens the mechanical properties of rocks and leads to tensile stress concentration around the flaws. The interaction of displacement localization zones formed around flaws complicates the damage or fracture processes of pre-cracked samples.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Kaiwen Xia, Rui Ren, Feng Liu
Summary: This study simulated the mechanical properties of fractured stratified rock using a two-dimensional particle flow code and analyzed the stress-strain curves, acoustic emission events, mechanical parameters, and cracking modes. The results showed that the arrangement of flaws and stratification had an impact on the stress-strain behavior and acoustic emission events of the specimens. Inclined stratification caused cracks to propagate along bedding planes, dominating the failure modes of the specimen. Flaws affected stress distribution and played a role in connecting micro cracks.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2022)
Article
Green & Sustainable Science & Technology
Chao Zhang, Xiaoguang Wang, Chuanyin Jiang, Haozhu Zhang
Summary: This study investigates the heat extraction performance of HDR reservoirs with heterogeneous fractures and stimulated reservoir volumes (SRV), indicating that the heterogeneity significantly impacts the heat extraction capability and that in situ stress plays a role in enhancing heat extraction.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Green & Sustainable Science & Technology
Lugen Chen, Dong Wang, Yujing Jiang, Hengjie Luan, Guangchao Zhang, Bin Liang, Xiangguo Kong
Summary: Studying the dynamical behavior of soft rocks in water-rich settings is crucial for ensuring sustainable coal extraction from deep water-saturated soft rock mines. A dynamic disturbance loading system was used to analyze the mechanical traits and acoustic emission behaviors of both dry and fully saturated soft rock. The experimental results provide theoretical support for understanding deformation and instability mechanisms in roadways of deep water-saturated soft rock mines, which is essential for ensuring sustainable coal resource development.
Article
Engineering, Multidisciplinary
Chaoyong Ma, Xingjie Ma, Yonggang Xu, Ling Xiang, Kun Zhang
Summary: A time-frequency domain signal decomposition method based on enhanced seeded region growing (ESRG) is proposed in this paper to identify and extract components in the signal with high accuracy and self-adaptability. The method has the capability to reduce noise interference and can be successfully applied to fault diagnosis.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Environmental
Wanchun Zhao, Zhizhang Wang, Zhenlong Song, P. G. Ranjith, Hui Zhang, Tingting Wang
Summary: This study reveals the relationship between rock failure and the jerk phenomenon by analyzing the acoustic emission characteristics of sandstone during compression. Sandstone failure involves local damage and stress transfer, with different forms of aggregation and transfer at each loading step. Overall, the damage area disperses to the edge of the sample and then concentrates to the center, accompanied by a series of jerks.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Chemistry, Multidisciplinary
Ling Dong, Dong Wang, Xiaoming Sun, Yujing Jiang, Hengjie Luan, Guangchao Zhang, Guanglei Zhou, Bin Liang
Summary: In this study, experiments were conducted on soft siltstone specimens under a combination of dynamic and static loads using the creep disturbance impact loading system and acoustic emission system. The mechanical properties and acoustic emission characteristics of soft rocks under different dynamic disturbances were quantitatively revealed based on failure characteristics and waveform signals. The experimental results showed that the deformation of the specimens increased as the initial average stress increased under dynamic disturbance. The magnitude of the initial average stress was closely related to the degree of damage and failure mode of the siltstone.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Geological
Kun Du, Yu Sun, Jian Zhou, Manoj Khandelwal, Fengqiang Gong
Summary: The influence of rock mineral composition and mineral grain size on the strength performance and acoustic emission (AE) characteristics of rocks was studied. Different mineral constituents were found to have significant effects on rock strength, while the relationship between mineral grain size and rock strength varied depending on the type of rock. Furthermore, the mineral composition and grain size of rocks played a crucial role in determining the AE signal characteristics and failure mode.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Engineering, Geological
Yuanyuan Pu, Jie Chen, Deyi Jiang, Derek B. Apel
Summary: This study proposes a deep learning model for locating acoustic emission (AE) sources in rocks where prior information is difficult to obtain. By conducting pencil-lead break tests to collect AE waveforms and coordinates, the deep learning model maps the relationship between the waveform and location, achieving accurate AE source prediction. The experimental results demonstrate the success of this model in tackling the location challenge.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Geochemistry & Geophysics
C. Fieseler, C. A. Mitchell, L. J. Pyrak-Nolte, J. N. Kutz
Summary: This study investigates the impact of moisture loss in rocks on acoustic emissions, focusing on two AE sources - fluid movement and mineral shrinkage, and utilizing methods such as Dynamic Mode Decomposition for signal analysis. It was found that acoustic signals emitted from samples experiencing only moisture loss without cracking could be effectively and accurately reconstructed, while reconstruction accuracy was challenged for samples with intricate crack networks formed during drying.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Ruiyue Yang, Richao Cong, Yanjin Gong, Zhaoyu Pang, Zhongwei Huang, Gensheng Li
Summary: This study quantified the mechanical responses of different minerals in layered rocks using nanoindentation tests and high-resolution scanning electron microscopy. The results showed that the mechanical properties of quartz and dolomite varied between different layers, with quartz displaying elastic-dominated deformations in the sandstone layer and medium-plastic deformations in the mudstone layer.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Energy & Fuels
Hui Zhang, Zhizhang Wang, Zhenlong Song, Yuzhu Zhang, Tingting Wang, Wanchun Zhao
Summary: Rock brittleness is an important factor affecting underground engineering disasters and energy extraction. The study conducted uniaxial compression experiments cooperated with AE monitoring on rock-like materials with different brittleness, finding that as the rock brittleness increased, the AE energy increased sharply during loading. Two evaluation criteria for rock brittleness were proposed based on the variation characteristic of the ib(E)-value during the rock failure process and the first pressure drop after the peak of the rock, showing better discrimination for different brittleness rocks.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2021)
Article
Mathematics, Interdisciplinary Applications
Lifan Rong, Jinlin Hu, Haoran Li
Summary: This paper investigates the mechanical properties, acoustic emission characteristics, and damage evolution laws of rocks with different defect holes, considering the influence of hole location. Rock models with different defect hole locations are constructed using a particle flow code. The study discusses the effects of different defect hole positions on mechanical characteristics, acoustic emission (AE) characteristics, damage evolution processes, and failure modes of the rock models. Results show that the elastic modulus has little variation among models with different defect hole locations, and that a defect hole at the center of the model exhibits a higher uniaxial compressive strength compared to a defect hole at the boundary of the model. The evolution of acoustic emission can be divided into three stages, with the position of the defect hole having little influence on the first two stages, but a significant impact on the third stage, including the intensity of acoustic emission and strain range. The position of the defect hole has a minimal effect on the initiation position of cracks in the rock, but it does affect the failure process.
COMPUTATIONAL PARTICLE MECHANICS
(2023)
Article
Geochemistry & Geophysics
Xu-Zhen Zheng, Hengxin Ren, Qinghua Huang, Xiaofei Chen
Summary: A new set of dynamic response coefficients is derived to improve the accuracy of computing seismoelectric wave fields in low-permeability porous media. The results show that the new coefficients achieve better fits with analytical solutions, even at extremely low permeability. The study also demonstrates the potential of the seismoelectric method for characterizing the permeability, salinity, and water saturation of low-permeability reservoirs.
PURE AND APPLIED GEOPHYSICS
(2023)
Article
Mechanics
Xuemin Zhou, Haichun Hao, Junjun Liu, Lei Yang, Zundong Yang, Xuan Wang, Zheng Gao, Yan Wu, Mingzhong Gao
Summary: This study analyzed the influence of water content on the efficiency of laser rock breaking and found that water has a positive effect on low-power laser breaking. Laser irradiation significantly reduces the strength of the rock, and increasing laser power increases the degree of rock fragmentation.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Shengyong Ding, Guojian Shao, Ang Li, Jingbo Su, Hougai Shi
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2017)
Article
Engineering, Multidisciplinary
Shengyong Ding, Guojian Shao, Yaoying Huang, Hougai Shi
Summary: This article investigates the issue of superconvergence of gradient solutions in polygonal elements, presenting a method based on superconvergent patch recovery to achieve superconvergent results at the centroids of sub-triangles. The accuracy and convergence properties of the proposed method are verified through numerical examples, and the potential application of the superconvergence recovery method in adaptive analysis is demonstrated.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2021)
Article
Mechanics
Hougai Shi, Hualin Fan, Guojian Shao
Summary: This paper investigates the filament winding trajectories and global stiffness properties of anisogrid composite lattice conical shells. Different types of helical ribs were studied to determine their impact on the stiffness properties, with the equidistant helical ribs showing the lowest stiffness values and equiangular helical ribs showing the highest stiffness values. The study also confirmed the closer correspondence of numerical results with curved-line assumptions compared to straight-line assumptions.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Multidisciplinary
Hougai Shi, Hualin Fan, Guojian Shao
Summary: This paper investigates the free vibrations of composite anisogrid lattice conical shells and theoretically evaluates the fundamental frequency. The results show that the analytical solution is accurate and efficient in dealing with lattice conical shells with variable cross-sectional radius, nonconstant stiffness and density. The effects of various parameters on the frequency value are also studied.
APPLIED MATHEMATICAL MODELLING
(2023)
