Article
Geosciences, Multidisciplinary
Peng Xia, Xinli Hu, Shuangshuang Wu, Chunye Ying, Chu Xu, Xuan Wang, Hao Chen
Summary: Columnar jointed basalt (CJB) has a wide distribution in the dam site of the Baihetan Hydropower Station. The mechanical properties of CJB, influenced by its columnar joint structure and fracture development, are crucial for the hydropower project. In-situ direct shear tests were conducted to study the shear behavior of CJB in different locations of the dam site area.
JOURNAL OF EARTH SCIENCE
(2023)
Article
Engineering, Geological
Tao Zhang, Weiya Xu, Huanling Wang, RuBin Wang, Long Yan, MingTao Hu
Summary: The study investigated the anisotropic mechanical behavior of columnar jointed rock masses (CJRM) under different joint dip angles. Results showed that the relationship between stress thresholds and joint dip angles exhibited a typical U-shape, with mechanical parameters gradually increasing with stress, and three main failure modes observed during the loading process.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Metallurgy & Metallurgical Engineering
Jian-cong Zhang, Quan Jiang, Guang-liang Feng, Shao-jun Li, Shu-feng Pei, Ben-guo He
Summary: This study investigated the geological characteristics and crack patterns of columnar jointed basalt, and developed a method to simulate irregular polygonal crack patterns. The results revealed that geometric irregularity significantly affects the mechanical properties of columnar jointed rock mass.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2022)
Article
Multidisciplinary Sciences
Luxiang Wang, Zhende Zhu, Shu Zhu, Junyu Wu
Summary: Columnar jointed rock mass (CJRM) is a special type of rock that has poor mechanical properties and weak self-supporting ability due to special symmetrical columnar joints, which can severely affect the excavation safety and stability of underground tunnels. This study generated CJRM geological numerical models with different dip angles based on the geological statistical parameters of the engineering site. Tunnel excavation and overloading tests were conducted on these models, and the results showed strong anisotropic characteristics in stress and displacement distributions. The study provides valuable references for the construction safety and support measures of CJRM excavation.
Article
Engineering, Geological
Tao Zhang, Weiya Xu, Jianrong Xu
Summary: This study conducted mechanical behavior tests on basalt specimens from the Baihetan hydropower station and proposed a coupled elastoplastic damage model. The test results showed that the crack closure, crack initiation, and crack damage stresses were approximately a certain percentage of the peak strength. The numerical simulation results were in good agreement with the test results, indicating that the proposed model accurately simulates the mechanical behavior of basalt under triaxial compression conditions.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2022)
Article
Engineering, Mechanical
Tao Zhang, Weiya Xu, Huanling Wang, Rubin Wang, Long Yan, Anchi Shi
Summary: This study investigates the effect of joint dip angle, fatigue effect, and stress level on the mechanical properties and failure behavior of CJRM specimens. The results indicate that the relationship between the characteristic stress and joint dip angle follows a typical U-shaped pattern, and the fatigue effect increases the number and distribution of cracks in CJRM specimens.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Construction & Building Technology
Qinyan Qiu, Guan Rong, Huqi Zhang, Wenfu Chen, Yaosheng Tan
Summary: By combining field measurements and numerical simulations, the efficiency of the seepage control system in the underground powerhouse of the Baihetan Hydropower Station was assessed. The study revealed that geological structures, particularly staggered zones and columnar joint basalt, heavily influenced the seepage patterns. The numerical simulations showed that grouting curtains and drainage hole arrays effectively lowered the groundwater levels.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Engineering, Geological
Zhichao Cheng, Shiqi Liu, Xuewen Fan, Anchi Shi, Kexin Yin
Summary: The main purpose of this paper is to report the movement process of the Tuandigou ancient landslide during reservoir impounding in the Baihetan dam area, and analyze the deformation behavior and triggering mechanism of the landslide. It is found that the landslide deformation is closely related to the reservoir water level. After the water level reached 810 meters, the ground cracks continued to expand and gradually linked up, resulting in an accelerated deformation of the landslide. The lithology in the study area also positively contributes to the slide movement. The results of this study are expected to provide guidelines for the early warning and control of the landslide during and after reservoir impounding.
Article
Engineering, Geological
Lida Xu, Guan Rong, Qinyan Qiu, Huqi Zhang, Wenfu Chen, Zhiheng Chen
Summary: In this study, a numerical model was developed to describe the complex seepage field at the Baihetan dam site before and after impoundment, and the numerical simulation of reservoir slope deformation was conducted based on the effective stress principle. The monitoring data collected during the initial impoundment of Baihetan validated the numerical model, and the spatiotemporal deformation law of the reservoir slope and its main controlling factors were analyzed. The study systematically characterized the impoundment-induced reservoir slope deformation features of Baihetan and discussed the possible deformation mechanism, providing an essential reference for evaluating the structural safety of the dam during operation.
ENGINEERING GEOLOGY
(2023)
Article
Engineering, Geological
Wenbin Lu, Zhende Zhu, Yanxin He, Xiangcheng Que
Summary: Columnar jointed basalt exhibits significant strength anisotropy, with different failure modes under various loading conditions. Analysis of its stability is crucial for excavated tunnel projects in such rock masses.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Hongjian Qian, Zhou Tan, Biao Li
Summary: In this study, numerical simulation and microseismic monitoring techniques were used to investigate the stability of the surrounding rock in the weak section of the #2 diversion tunnel. The results revealed the instability failure mechanism inside the rock mass and identified potential danger areas. The findings can provide technical support for the construction of similar geologically weak underground projects.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Multidisciplinary
Zhi Li, Haoyu Mao, Biao Li, Xiang Zhou, Guo Liao, Jianjun Chen
Summary: A microseismic monitoring system was developed in this study to analyze the stability of the surrounding rock of a spillway tunnel in a hydropower station. The results indicated that the distribution and magnitude of microseismic events can serve as signs of future damage to the rock.
APPLIED SCIENCES-BASEL
(2022)
Article
Construction & Building Technology
Gang Han, Chuanqing Zhang, Hemant Kumar Singh, Shuling Huang, Hui Zhou, Yang Gao
Summary: This study systematically examines the engineering characteristics of interlayer shear weakness zones (ISWZs) in and around the Baihetan hydropower station area based on laboratory and field investigations. The results show that ISWZs have complex occurrence features and variations in thickness, mineral composition, fabrics, and structures. A classification method for large-scale ISWZs is developed based on clay proportion and infilled ratio, considering their undulating state and physical and mechanical properties. This investigation contributes to a proper understanding and classification of large-scale ISWZs.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Construction & Building Technology
Shu Zhu, Xiangcheng Que, Zhende Zhu, Bei Han
Summary: This study investigates the columnar jointed basalt at the dam site of the Baihetan hydropower station and finds that it exhibits geometric anisotropy. By establishing improved three-dimensional constitutive relationships and considering the impact of transverse joints and internal staggered zones, the deformation during tunnel excavation was successfully simulated. The findings provide crucial reference values for engineering optimization design.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Jun Yu, Qiang Zhang, Weiya Xu, Rubin Wang, Han Zhang
Summary: This study focuses on the relaxation of columnar joint rock masses during the excavation of the diversion tunnel of the Baihetan hydropower station, inverting deformation parameters and introducing a relaxation factor to describe the deterioration of anisotropic parameters. A program for calculating anisotropic elastoplastic model is developed and verified through simulation and acoustic detection, providing a necessary reference for the design and construction of hydropower projects.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geochemistry & Geophysics
Peiyang Yu, Peng-Zhi Pan, Guangliang Feng, Zhaofeng Wang, Shuting Miao
Summary: Understanding the time-dependent characteristics of Beishan granite after excavation is crucial for ensuring the long-term stability and disaster control of the high-level radioactive waste repository. Experimental results show that the unloading path significantly affects the instantaneous volume deformation, but has minor effects on creep strain. The axial and lateral creep strain are mainly determined by creep fracture potential, which can be evaluated using a unified time-dependent fracture potential index. A damage mechanical model based on time-dependent subcritical crack growth theory reveals that strain hardening dominates the granite creep process and the strain softening effect is enhanced with increasing fracture potential index.
Article
Metallurgy & Metallurgical Engineering
Jian-cong Zhang, Quan Jiang, Guang-liang Feng, Shao-jun Li, Shu-feng Pei, Ben-guo He
Summary: This study investigated the geological characteristics and crack patterns of columnar jointed basalt, and developed a method to simulate irregular polygonal crack patterns. The results revealed that geometric irregularity significantly affects the mechanical properties of columnar jointed rock mass.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2022)
Article
Engineering, Geological
Wei Zhang, Xia-Ting Feng, Zhi-Bin Yao, Lei Hu, Ya-Xun Xiao, Guang-Liang Feng, Wen-Jing Niu, Yu Zhang
Summary: This study presents an analysis of an extremely intense fault-slip rockburst case in a deep tunnel in southwestern China. The study aims to understand the development and occurrence mechanisms of the rockburst. According to the results, the fault-slip rockburst exhibits intermittent occurrence and creates psychological pressure on workers. The rockburst can be captured by the microseismic monitoring system. The presence of a large natural structure plane enhances the destructiveness of the rockburst. These findings are important for further research on fault-slip rockbursts and for planning appropriate warning and mitigation measures.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Engineering, Geological
Hong Zheng, Shiqi Cao, Wei Yuan, Quan Jiang, Shaojun Li, Guangliang Feng
Summary: This study investigates the time-dependent deformation of rock and its impact on permeability and deformation evolution in geological storage. A time-dependent hydro-mechanical coupling model is proposed to characterize the long-term influences of evolving permeability and deformation in a saline reservoir. The model is verified through experimental testing and simulation, showing its practicality and validity.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Environmental Sciences
Guangtao Guo, Dingping Xu, Guangliang Feng, Xiaogang Wu, Yuxin Zhou
Summary: This study investigates the evolution of the mechanical properties of surrounding rock in underground caverns in high-stress regions. Triaxial tests were conducted on granite samples under different confining pressures. The results show that the stress-strain curve can be divided into five stages and the strength of each stage increases with increasing confining pressure. The failure of the granite is characterized by shear failure, and the internal friction angle and cohesion increase with crack volume strain. Confining pressure also significantly influences energy evolution. The energy consumption ratio can serve as a criterion for rock failure. The research provides a reference for predicting the instability of surrounding rock masses in high-stress underground caverns.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Engineering, Environmental
Zhi Zheng, Hao Su, Guoxiong Mei, Yajun Cao, Wei Wang, Guangliang Feng, Quan Jiang
Summary: This paper investigates the stress-induced brittle-ductile behavior of deeply buried rock, focusing on prismatic marble. Triaxial compression tests were conducted under different confining pressures to analyze the strength, deformation, and brittle-ductile characteristics of the marble. A method to control the brittle-ductile behavior by adjusting the key parameters (beta and B-d) affecting the pre-peak hardening rate and post-peak damage rate was proposed. The relationship between the key parameters and confining pressure was established. An elastoplastic damage constitutive relation was developed and numerically simulated. The proposed model accurately captured the stress-induced brittle-ductile behavior of deeply buried rock.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Geochemistry & Geophysics
Guangliang Feng, Lanai Cen, Manqing Lin, Gang Yang, Xianfu Li, Jingang Ma, Guofeng Liu
Summary: This paper evaluates the risk of roof fall occurring in phosphate mines using a case study of a mine in Shanshuya, China. Four evaluation models are employed to assess the risk, and the results show some inconsistencies between the models. Therefore, a combined evaluation method is proposed and applied to the Shanshuya phosphate mine, producing more reliable results.
Article
Engineering, Geological
Fuqiang Ren, Chun Zhu, Manchao He, Junlong Shang, Guangliang Feng, Jinwen Bai
Summary: By conducting true triaxial unloading rockburst tests, the difference between static-driven and dynamically triggered rockbursts was examined. The study compared and analyzed the rockburst characteristics, intensities, and precursors of three different types of rockbursts. The findings suggest that the increment f (alpha) parameter and stress drop can be used for long-term monitoring and short-term prediction of rockbursts.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Editorial Material
Chemistry, Multidisciplinary
Guang-Liang Feng, Sanichiro Yoshida, Giuseppe Lacidogna
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Environmental
Yang Yu, Jun Wang, Guang-Liang Feng, Da-Xin Geng, Hao-Sen Guo
Summary: The deterioration characteristics and damage principle of limestone under the coupling action of aqueous chemical solution and consecutive loading-unloading cycles were investigated. Laboratory cyclic consecutive loading-unloading test combined with acoustic emission monitoring was used to study the mechanics of limestone under different chemical corrosion conditions. The results showed that limestone exhibited more significant deterioration in peak strain and peak strength with lower pH acid and longer corrosion time. The quality, longitudinal wave velocity, and through-crack size of limestone were also affected by the acidic solution. The results provide experimental reference for evaluating the long-term stability of engineering rock mass.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Mining & Mineral Processing
Haosen Guo, Qiancheng Sun, Guangliang Feng, Shaojun Li, Yaxun Xiao
Summary: The damage-fracture evolution of deep rock mass has distinct characteristics, as revealed by field tests in 2400-meter deep tunnels. The evolution of the excavation damaged zone depth is consistent with that of the fractured zone depth. The research results provide valuable insights for the monitoring and support design of future construction projects.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2023)
Article
Metallurgy & Metallurgical Engineering
Guang-liang Feng, Jin-gang Ma, Bing-rui Chen, Ya-xun Xiao, Quan Jiang, Peng-xiang Li, Man-qing Lin
Summary: Rockburst hazards caused by excavation in deep TBM tunnels are a threat to construction safety. This study investigated the characteristics and intensity identification of rockburst events in deep TBM tunnels based on 43 events in the Neelum-Jhelum hydropower station in Pakistan. The study established a criterion for identifying rockburst intensity using the quantitative parameter of microseismic energy. The results showed a nonlinear relationship between rockburst intensity and microseismic energy, and the criterion was validated in the project as reliable for advance warning of rockburst events in deep TBM tunnels.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2023)
Article
Mathematics, Interdisciplinary Applications
Xiu-yang Liu, Ding-ping Xu, Shu-qian Duan, Huai-sheng Xu, Guang-liang Feng, Shi-li Qiu, Quan Jiang
Summary: Exploring the mechanical properties and crack characteristics of granites at the grain scale is important to understand brittle failures in deep-buried hard rocks. This study derived the microscopic mechanical properties of granite minerals and discussed the relationship between these properties. A parameter calibration process was proposed to reduce randomness in the calibration process. The study also discussed the microcrack evolution and crack characteristics of different minerals in granite. The results reveal the crucial role of intragranular cracks in the failure process of brittle rocks.
COMPUTATIONAL PARTICLE MECHANICS
(2023)
Article
Engineering, Geological
Yaxun Xiao, Shujie Chen, Liu Liu, Guangliang Feng, Junbo Zhou, Dongbo Hou, Shaojun Li, Jianing Guo
Summary: This paper proposes a novel method based on instantaneous phase difference intensity (IPDI) for accurately determining the S-wave arrival time of microseismic signals in tunnels. The IPDI method can correctly determine the arrival time of S-waves even when they are overlapped by P-waves. The method was successfully applied to microseismic monitoring in a deeply buried tunnel, improving the accuracy of locating rockburst and microseismic events.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Engineering, Geological
Liu Guo-feng, Feng Kun, Yan Chang-gen, Feng Guang-liang, Xu Ding-ping, Zhou Chi
Summary: This study proposes a probabilistic evaluation method for excavation unloading response of rock slopes considering the uncertainty of mechanical parameters. The method is applied to analyze a cutting slope along the Beijing-Qinhuangdao expressway under construction. Probabilistic statistical models of rock mass mechanical parameters are constructed based on laboratory tests and geological survey data, and the simulation analysis is carried out to obtain probability distributions of slope safety factor, displacement, and plastic zone. The results show the applicability of the proposed method.
ROCK AND SOIL MECHANICS
(2023)
