Article
Engineering, Geological
Chenxi Zhao, Zixin Zhang, Qinghua Lei
Summary: This study numerically investigates the spatio-temporal damage evolution and fracture displacements around underground excavation in fractured rock masses. The results show the important roles of both direct and indirect couplings in rock disturbance induced by excavation. The findings have implications for various geoengineering applications involving underground excavation.
ENGINEERING GEOLOGY
(2021)
Article
Engineering, Geological
Junhong Huang, Xiaoqing Wei, Yi Luo, Hangli Gong, Tingting Liu, Xinping Li
Summary: This study investigated the deformation and failure of surrounding rock mass triggered by sudden changes of rock quality encountered in a tunnel excavation project, focusing on the geological disasters caused by fracture zones. The findings from a field case analysis of the Daliang Tunnel in China revealed the deformation profiles of the surrounding rock mass at different distances from the fracture zone. The relationship between the deformation of the surrounding rock mass in the fracture zone and the materials, length of advanced support, and excavation advance rate was also explored. The study emphasized the significance of controlling rock mass deformation in fracture zones.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Engineering, Civil
R. Zhang, H. P. Xie, L. Ren, J. H. Deng, M. Z. Gao, G. Feng, Z. T. Zhang, X. P. Li, Q. Tan
Summary: The deeper the burial depth, the more severe the rock damage and the more complex the fracture network caused by excavation-induced deterioration. At shallow depths, an excavation-damaged zone and excavation-disturbed zone were found, while at greater depths, a highly damaged zone and excavation-disturbed zone were observed. The formation of excavation-damaged zones at deep depths follows a stress-concentration-controlled mode, while a pure unloading-controlled mode is observed at very shallow depths.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2022)
Article
Mechanics
Zongyue Fan, Huming Liao, Hao Jiang, Hao Wang, Bo Li
Summary: A dynamic adaptive eigenfracture algorithm is proposed to study crack propagation in brittle materials, improving convergence rate by using effective energy release rate as adaptive refinement criteria. Validation through comparison with experimental results shows excellent agreement in predicting crack angle in concrete and fracture propagation speed in PMMA. The method is effective in addressing mesh biased crack paths even with relatively coarse mesh in simulations.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Civil
Zeyu Li, Hongwei Huang, Mingliang Zhou, Dongming Zhang
Summary: This study uses the material point method (MPM) to simulate the failure responses of a rock tunnel face during excavation through the fault-fracture zone (FFZ). A numerical study was conducted to compare a physical model test and validate the feasibility of using the MPM in simulating tunnel face failure. The simulation results suggest that factors such as cohesion, friction angle, tunnel cover depth, and FFZ thickness significantly influence failure responses.
Article
Engineering, Multidisciplinary
Moirangthem Dinachandra, Alankar Alankar
Summary: An adaptive refinement scheme is proposed in this study to reduce the complexity and cost of computations in phase-field models, and the effectiveness of the method is successfully demonstrated.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Xinguang Zhu, Chun Feng, Pengda Cheng, Xinquan Wang, Shihai Li
Summary: A new three-dimensional hydraulic fracturing model is proposed in this paper, which can comprehensively consider the continuum field, crack opening, pore seepage field and fracture seepage field. The model accurately predicts the fracture pattern and captures the poroelastic stress through comparison and analysis.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Geochemistry & Geophysics
Fanzhen Meng, Louis Ngai Yuen Wong, Tianyang Guo
Summary: Rough fault surfaces play a dominant role in determining the mode of sliding. Stick-slip behavior occurs on all rough fractures during sliding, with stress drops and fault gouges increasing with normal stress. Micro-damage on post-shear surfaces includes powder-sized gouge, micro-cracks, and grain edge wear, increasing with normal stress. Different fault types have little discernible effect on stress drop. The study contributes to understanding the mechanics of dynamic geohazards associated with shear failure on rough faults or fracture surfaces.
Article
Engineering, Manufacturing
Sirui Gong, Han Wang, Chuan Tian, Zhenlong Wang, Yukui Wang
Summary: This paper introduces a new method to prevent the fracture of monocrystalline silicon during EDM by controlling the topography of single discharge crater. It is found that by controlling the morphology of single discharge crater, less fracture can be guaranteed during the manufacturing process. This method involves narrow pulse width discharge and focused experimental tests on Cartesian surface of monocrystalline silicon with different machining parameters to achieve a controlled fracture in the complex 3D structure.
MATERIALS AND MANUFACTURING PROCESSES
(2022)
Article
Engineering, Geological
Liangjie Gu, Xia-Ting Feng, Rui Kong, Chengxiang Yang, Qiang Han, Yuelin Xia
Summary: The excavation of deep hard rock tunnels can cause disturbances in the initial stress balance, leading to rockburst, spalling, and collapse. This study analyzes and summarizes engineering cases to divide the surrounding rock of deep tunnels into high-, medium-, and low-risk fracture zones and generalize the excavation stress paths of these zones. The study reveals that the stress difference caused by excavation stress paths determines the level of surrounding rock fracture. The research proposes a method for evaluating the influence of excavation stress paths on rock fracture anisotropy. The findings provide insights into the mechanism of excavation stress paths affecting rock burst disasters in deep hard rock tunnels and offer guidance for selecting support schemes.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Abhinav Gupta, U. Meenu Krishnan, Tushar Kanti Mandal, Rajib Chowdhury, Vinh Phu Nguyen
Summary: In this work, an adaptive mesh refinement (AMR) algorithm based on effective crack driving energy is proposed to accurately simulate crack initiation. The proposed algorithm shows effective performance in brittle, cohesive, and dynamic fractures.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Mechanics
U. Meenu Krishnan, Abhinav Gupta, Rajib Chowdhury
Summary: An error estimator is proposed for adaptive mesh refinement (AMR) in phase-field fracture (PFF) simulation. It works with the mesh-induced crack (MIC) method, improving the computational efficiency of the AMR algorithm. The estimator is derived from the iterative change in crack driving energy over each element. Sensitivity analysis and comparison with a non-adaptive algorithm demonstrate the accuracy and effectiveness of the proposed AMR algorithm.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Geological
Zhi-hao Zhou, Hua-ning Wang, Ming-jing Jiang
Summary: This study analytically examines the stress-strain relationships of anisotropic granular materials composed of regularly arranged ellipsoidal particles in the elastic stage using a micro-structural mechanics approach. The macroscopic elastic constants are derived in closed form with respect to microscopic parameters, showing changes in material properties as particle anisotropy increases. The results are validated using different element method (DEM), confirming the orthotropic nature of regularly arranged ellipsoid particle assemblies.
Article
Construction & Building Technology
Daning Zhong, Jianlin Chen, Hui Zhou, Xiangrong Chen, Yali Jiang
Summary: The analysis and simulation of brittle failure of hard rock tunnels under high stress is fundamental for understanding and controlling the characteristics of rock masses and regulating the stability of surrounding rocks in underground projects. This paper summarizes the spalling characteristics of the surrounding rock in an exploratory tunnel on the right bank using the continuum-based discrete element method (CDEM). The numerical results show good agreement with field observations and provide insights into the brittle failure characteristics of basalt under high-stress conditions.
ADVANCES IN CIVIL ENGINEERING
(2022)
Review
Computer Science, Interdisciplinary Applications
Yongliang Wang, Nana Liu
Summary: Research indicates that the stress shadow effects around fractures are the main mechanism causing uneven development of multistage hydrofracturing fractures. In order to understand and evaluate this phenomenon, further studies and simulations of stress shadow effects are necessary. The main controlling factors of stress shadow effects are fracture initiation sequence, perforation cluster spacing, and well spacing.
ENGINEERING COMPUTATIONS
(2023)
Article
Geosciences, Multidisciplinary
Dalei Peng, Qiang Xu, Xianlin Zhang, Huilin Xing, Shuai Zhang, Kai Kang, Xing Qi, Yuanzhen Ju, Kuanyao Zhao
JOURNAL OF ASIAN EARTH SCIENCES
(2019)
Article
Energy & Fuels
Hang Zhang, Chunchi Ma, Tianbin Li
Article
Energy & Fuels
Fei Ren, Lei Ge, Arash Arami-Niya, Thomas E. Rufford, Huilin Xing, Victor Rudolph
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2019)
Article
Energy & Fuels
Fei Ren, Lei Ge, Vitaliy Stelmashuk, Thomas E. Rufford, Huilin Xing, Victor Rudolph
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2019)
Article
Engineering, Geological
Huilin Xing, Zhiting Han
Article
Chemistry, Multidisciplinary
Hang Zhang, Chunchi Ma, Veronica Pazzi, Yulin Zou, Nicola Casagli
APPLIED SCIENCES-BASEL
(2020)
Article
Chemistry, Analytical
Hang Zhang, Jun Zeng, Chunchi Ma, Tianbin Li, Yelin Deng, Tao Song
Summary: A microseismic multi-classification (MMC) model is proposed based on STFT technology and CNN, which shows optimal performance in accurately classifying microseismic data with low sensitivity to noise and wide generality.
Article
Geochemistry & Geophysics
Guodong Jin, Huilin Xing, Tianbin Li, Rongxin Zhang, Junbiao Liu, Zhiwei Guo, Zihan Ma
Summary: This study focuses on the numerical simulation of fluid flow in unconventional reservoirs with fractures, demonstrating the dominance of fractures near the wellbore and the presence of three distinct flow regimes in the reservoir with fractures intersecting the well. The validation and application of the model show the feasibility and practicality of the integrated approach for investigating transient-pressure behaviors in unconventional reservoirs.
Article
Environmental Sciences
Jiangjun Wan, Yuxin Li, Chunchi Ma, Tian Jiang, Yi Su, Lingqing Zhang, Xueqian Song, Haiying Sun, Ziming Wang, Yutong Zhao, Kaili Zhang, Jinxiu Yang
Summary: The study reveals that the coordinated development between the social economy and ecological environment in the Chengdu-Chongqing urban agglomeration is overall at a low level, with significantly higher coordination in more developed regions compared to less developed regions, leading to clear spatial differences. Key factors influencing the coordinated development include urbanization rate, ratio of actual use of foreign capital and GDP, ratio of total export-import volume and GDP, proportion of days with good air quality, and per capita public green space area.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2021)
Article
Chemistry, Multidisciplinary
Chao Chen, Tianbin Li, Chunchi Ma, Hang Zhang, Jieling Tang, Yin Zhang
Summary: This paper summarizes the main factors affecting the large deformation of soft rock tunnels, using a series of engineering geological property evaluation methods and mathematical models. The effectiveness and accuracy of this method were verified through actual monitoring and neural network validation, providing important mechanical parameters for design and construction to ensure the stability of the surrounding rock mass during construction and the safety of the lining structure during operation.
APPLIED SCIENCES-BASEL
(2021)
Article
Environmental Sciences
Jiangjun Wan, Yutong Zhao, Kaili Zhang, Chunchi Ma, Haiying Sun, Ziming Wang, Hongyu Wu, Mingjie Li, Lingqing Zhang, Xiaohong Tang, Ying Cao, Li Tang, Jinxiu Yang
Summary: This study examines the healthy community-life circle in the downtown area of Chengdu, China from both an objective measurement and subjective perception of residents. The results show differences in coverage rates between different districts and decreasing convenience in accessing health service facilities from the city center to the outskirts. The social environment, facility layout, and residents' travel habits are related to health facility satisfaction.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2022)
Article
Energy & Fuels
Yiran Zhu, Zhang Shi, Huilin Xing, Zhongwei Chen
Summary: Coal cleats are the main flow path for gas and water during coal seam gas (CSG) production and their aperture plays a crucial role in capillary pressure and gas production rate. This study develops an improved capillary pressure model that considers the impact of cleat aperture change on capillary pressure value and residual saturation. The model is extended to a reservoir scale, revealing that changes in cleat aperture can significantly alter capillary pressure and gas production rate. The findings provide valuable insights into understanding the influence of cleat aperture change on capillary pressure during CSG production.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2022)
Article
Environmental Sciences
Chunchi Ma, Xuefeng Ran, Weihao Xu, Wenjin Yan, Tianbin Li, Kunkun Dai, Jiangjun Wan, Yu Lin, Ke Tong
Summary: Numerous microseismic signals are produced during earthquakes, geological disasters, or underground excavations. However, noise signals that resemble microseismic signals pose challenges to their detection and assessment. This study proposes a precise model for identifying and classifying microseismic signals using deep learning technology and short-time Fourier transform (STFT). The model demonstrates good time-frequency feature extraction ability and performs well in classifying similar noise and low-SNR microseismic signals. This signal-processing method can be extended to other data-driven fields.
Article
Environmental Sciences
Chunchi Ma, Wenjin Yan, Weihao Xu, Tianbin Li, Xuefeng Ran, Jiangjun Wan, Ke Tong, Yu Lin
Summary: Microseismic monitoring can capture microseismic signals released from rock mass fractures to evaluate the development of geological disasters. However, the low signal-to-noise ratio of these signals due to complex environmental factors makes effective information extraction challenging. Therefore, denoising and detection are crucial for processing microseismic signals and extracting source information.
Article
Green & Sustainable Science & Technology
Xinxing Liu, Xudong Ma, Mingming He, Chunchi Ma
Summary: In this paper, the anisotropy of four types of rocks is studied through uniaxial compression tests and digital drilling tests in different directions. By analyzing the interrelationships between drilling parameters, the anisotropy index of rock is defined using the concept of cutting strength ratio, and a new method for judging rock anisotropy is proposed.
