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
Engineering, Geological
Hongliang Tu, Hui Zhou, Yang Gao, Jingjing Lu, Hemant Kumar Singh, Chuanqing Zhang, Dawei Hu, Mingming Hu
Summary: The study conducted a probability analysis of deep-buried diversion tunnels using Monte Carlo simulation, with a case study of the Jinping II hydropower station diversion tunnels. The results showed that the vertical load and radial subgrade modulus are important factors affecting the safety of tunnel support structures.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2021)
Article
Geosciences, Multidisciplinary
Ci Song, Runqiu Huang, Xiaolu Tang
Summary: This study assessed the impact of tunnel discharging on vegetation in the karst and non-karst areas during the construction of the Jinping II hydropower station in China. The results showed that while the overall vegetation remained largely unchanged, the vegetation in the karst area experienced a more significant decrease compared to the non-karst area. The research provides important insights for vegetation protection in large-scale underground construction worldwide.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Tian-hui Ma, Chun-an Tang, Fei Liu, Shi-chao Zhang, Zhi-qiang Feng
Summary: Rockburst hazard is a significant issue in deep rock mechanics, and can be effectively monitored and controlled through methods such as microseismic monitoring and numerical simulation. This approach has been successfully applied in deep underground engineering projects to reduce the incidence of rockburst events.
GEOMATICS NATURAL HAZARDS & RISK
(2021)
Article
Engineering, Civil
Amin Manouchehrian, Pinnaduwa H. S. W. Kulatilake
Summary: The suggested method aims to reduce the risk of strainburst in burst-prone grounds by destressing rocks through cutting notches at the excavation boundary. Results show that adding notches in tunnel walls can alleviate rock stress and reduce the violence of failures. The parametric study is crucial in determining the impact of notch dimensions on stress distribution, deformation, and failures around the tunnel.
Article
Geochemistry & Geophysics
Qun Yu, Chunyan Bao, Shengji Jin, Junxiang Wang
Summary: This paper investigates the nucleation mechanism and instability failure mechanism of strain rockburst by studying microseismic monitoring technology and the regularity of microseismic parameters. The results reveal the nucleation process and failure mechanism of strain rockburst, and explore the internal relationship between microseismic evolution law and rockburst process. The study provides significant evidence and insight into characterization of strainbursts through the quantitative interpretation of source parameters, and suggests that these parameters can be effectively used as precursor information and early warning index of strain rockburst failure. The findings of this study have important implications for the monitoring and prevention of rockburst in deep tunnels.
Article
Engineering, Civil
Amin Manouchehrian, Pinnaduwa H. S. W. Kulatilake
Summary: A destressing method for reducing the strainburst risk in burst-prone grounds is proposed. This method involves cutting notches at the excavation boundary to destress the rock. The study shows that adding notches can reduce stress concentration at the tunnel wall and mitigate the violence of failure.
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
Geochemistry & Geophysics
Tianyang Li, Yu Jeffrey Gu, Donald C. Lawton, Hersh Gilbert, Marie Macquet, Genevieve Savard, Jingchuan Wang, Kristopher A. Innanen, Nian Yu
Summary: Monitoring subsurface velocity variations due to industrial activities using passive seismic imaging techniques has gained popularity in recent years. In this study, the spatiotemporal variations of persistent, non-ambient seismic noise during CO2 sequestration are examined. Two non-ambient local noise sources correlated with local industrial activities are detected during the study period.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Chemistry, Multidisciplinary
Ruixiong Xue, Yinghui Kong, Na Wu
Summary: The Shuangjiangkou hydropower station in China has complex geological conditions and frequent rockbursts during tunnel excavation. The use of microseismic monitoring technology and Hilbert-Huang transform (HHT) instantaneous frequency analysis can predict rockbursts by analyzing the frequency and energy characteristics of microseismic signals.
APPLIED SCIENCES-BASEL
(2023)
Article
Construction & Building Technology
Shibin Tang, Jiaming Li, Liexian Tang, Leitao Zhang
Summary: The occurrence of rockbursts in water-rich and water-poor areas is influenced by the classification of surrounding rock and excavation methods, and water can accelerate rockbursts under high stress conditions. Stress release is an effective method to control rockbursts.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Engineering, Environmental
Lei Hu, Xia-Ting Feng, Zhi-Bin Yao, Wei Zhang, Wen-Jing Niu, Xin Bi, Guang-Liang Feng, Ya-Xun Xiao
Summary: This article proposes a rockburst time warning method based on microseismic monitoring and the blasting cycle as the unit of time. The developed models achieve accuracies of approximately 74.6%, 71.2%, and 63.1% for predicting rockburst occurrence in subsequent blasting cycles in a railway tunnel excavation. This combination of MS monitoring and artificial intelligence provides a new approach for rockburst time warning.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Geosciences, Multidisciplinary
Qun Yu, Danchen Zhao, Yingjie Xia, Shengji Jin, Jian Zheng, Qingkun Meng, Chaoqian Mu, Jingchi Zhao
Summary: This article focuses on the monitoring and prediction of rockburst disasters in the deep diversion tunnel of the Jinping Hydropower Station. Using microseismic monitoring technology and seismology principles, the precursor characteristics of rockburst disasters are analyzed and the relationship between microseismic activity and rockburst micro-fractures is studied. A multivariate early warning method based on comprehensive analysis of source parameters is proposed, providing an accuracy of 80.6% for rockburst prediction and warning in similar tunnel engineering projects.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Tianhui Ma, Daoyuan Lin, Liexian Tang, Limin Li, Chun'an Tang, Kedar Prasad Yadav, Wendong Jin
Summary: This study conducted in-depth records and analysis of the geological and rockburst data of the Qinling Water Tunnel. It proposed a rockburst tendency criterion, utilized microseismic monitoring technology for rockburst monitoring and early warning, and compared the results with statistical data to find a high accuracy in rockburst prediction.
GEOMATICS NATURAL HAZARDS & RISK
(2022)
Article
Engineering, Geological
Liu Liu, Shaojun Li, Yaxun Xiao, Shujie Chen, Zhaofeng Wang, Guangliang Feng, Yao Wang
Summary: Microseismic (MS) monitoring is an effective technology for rockburst disaster prevention in deeply buried tunnels. Accurate MS source location is challenging due to the changing velocity distribution of surrounding rocks. This paper presents a real-time velocity inversion strategy using drilling and blasting seismic data, allowing for improved MS location accuracy. Field experiments in China Jinping Underground Laboratory Phase II further verify the performance of the proposed MS location method.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Engineering, Geological
Sixia Gong, Tao Zhao, Jidong Zhao, Feng Dai, Gordon G. D. Zhou
Summary: Slit dams are open-check barrier structures widely used in mountainous regions to resist the destructive impacts of granular flows. A numerical study using DEM showed that by adjusting relative post spacing and particle clump aspect ratio, the design of slit dams can be optimized to increase trapping efficiency.
Article
Engineering, Multidisciplinary
Xiang Li, Haoyu Mao, Biao Li, Nuwen Xu
Summary: A dynamic early warning model of rockburst using microseismic multi-parameters based on Bayesian network is proposed in this paper. By pre-processing historical data of rockburst, 114 sets of parameters required for Bayesian network structure learning are obtained, and belief update is performed by the Junction Tree algorithm. The model shows good precision and can effectively realize early warning of rockbursts.
ENGINEERING SCIENCE AND TECHNOLOGY-AN INTERNATIONAL JOURNAL-JESTECH
(2021)
Article
Engineering, Geological
Hongbo Du, Feng Dai, Mingdong Wei, Ang Li, Zelin Yan
Summary: The study finds that static confining pressure and dynamic loading rate enhance the load-carrying capacity of rocks, but the shear component limits the dynamic peak stress. With an increase in static confining pressure, the failure surface expands outward, while the compressive deformation modulus of rocks decreases with increasing shear component. The fragmentation behavior of rocks is restricted by static confining pressure and the shear component of dynamic loading, leading to a change in failure pattern as specimen inclination angle and static confining pressure increase.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Engineering, Multidisciplinary
Ruochen Jiang, Feng Dai, Yi Liu, Ang Li
Summary: This study developed a microseismic (MS) location method using the fast marching method (FMM) and a second-order difference approach, which was validated through numerical experiments and successfully applied to locate blasting activities and MS events. The method significantly reduced location errors, providing a more accurate rock fracture location.
Article
Engineering, Geological
Peng Feng, Yuan Xu, Feng Dai
Summary: In rock specimens containing fissures, the type of cracks, strain rate, and symmetry of the fissures all have an impact on dynamic strength and energy dissipation under dynamic conditions. The dynamic strength of rock specimens significantly increases with increasing strain rate, while the dynamic elastic modulus remains constant regardless of loading rate. Additionally, the distribution of fragment size and energy dissipation density are also affected by the characteristics of the fissures.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Engineering, Geological
Ruochen Jiang, Feng Dai, Yi Liu, Ang Li, Peng Feng
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Construction & Building Technology
Ang Li, Feng Dai, Yi Liu, Hongbo Du, Ruochen Jiang
Summary: A novel dynamic method is proposed for evaluating the stability of high sidewalls subjected to flexural-toppling by integrating derived criterion, continuum modelling and microseismic data. The study defines a geo-mechanical model for analyzing toppling rock strata on high sidewalls and deduces potential energies equations using the Rayleigh-Ritz method. A quantitative stability evaluation methodology is presented considering progressive failure and the influence of fractures along bedding planes.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2021)
Article
Mining & Mineral Processing
Wei You, Feng Dai, Yi Liu, Hongbo Du, Ruochen Jiang
Summary: This study introduces a numerical servo triaxial Hopkinson bar (NSTHB) to investigate the dynamic responses of rocks under a true triaxial stress state. The results indicate that the increase in intermediate principal stress leads to an increase in dynamic strength and elastic modulus of rocks, while the dynamic elastic modulus remains independent of the dynamic strain rate. Additionally, the study shows that the intermediate principal stress significantly affects the dynamic failure modes of rocks.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2021)
Article
Environmental Sciences
Li Qian, Jianhai Zhang, Xianliang Wang, Yonghong Li, Ru Zhang, Nuwen Xu, Zhiguo Li
Summary: In this study, the creep behavior of granite in Shuangjiangkou underground powerhouse was investigated, and a new parameter DPR, the ratio of deviatoric stress to peak strength, was proposed. Based on the test results, an improved generalized Kelvin creep model was introduced to accurately describe the primary and secondary creep behavior of granite under given deviatoric stresses and confining pressures.
ENVIRONMENTAL EARTH SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Quanfu Ding, Biao Li, Haijian Su, Nuwen Xu, Xuehua Li, Xingyang Deng
Summary: High geo-stresses and complicated geological conditions are typical characteristics in the traffic tunnel of the tailrace surge chamber at the Shuangjiangkou hydropower station. Microseismic monitoring technology helped evaluate rock mass stability and reveal rock fracturing mechanisms. Weak structures and the multi-cavern effect exacerbated rock mass damage during excavation-unloading, with tensile failure being the main fracturing type.
GEOMATICS NATURAL HAZARDS & RISK
(2022)
Article
Engineering, Geological
Xiao Huang, Nuwen Xu, Wei Wu, Peiwei Xiao, Linlu Dong, Biao Li
Summary: This study uses microseismic monitoring and numerical modeling to investigate the stability of intersecting discontinuities in rock masses. The results suggest that the stability is influenced by geological features and mechanical properties, emphasizing the importance of paying attention to key properties favorable for rock instability.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Metallurgy & Metallurgical Engineering
Biao Li, Quan-fu Ding, Nu-wen Xu, Feng Dai, Yuan Xu, Hong-lue Qu
Summary: Rock mass large deformation in underground powerhouse caverns is a significant hazard in hydropower engineering in Southwest China. Microseismic monitoring techniques can be used to detect the fractures generated during the development of rock mass large deformation. The study analyzes the MS b-values associated with rock mass large deformation and their temporal variation, and provides valuable information for understanding the fracturing characteristics of MS sources and early warning of rock mass large deformation in underground powerhouse caverns.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2022)
Article
Engineering, Geological
Peiwei Xiao, Haoyu Mao, Bo Qian, Biao Li, Xingguo Yang, Nuwen Xu
Summary: A high-precision microseismic monitoring system was established to monitor surrounding rock micro-fractures in the underground powerhouse of Shuangjiangkou Hydropower Station. Qualitative analysis of the damage mechanism of surrounding rock microfractures was conducted based on the source parameters of microseismic events. Numerical analysis using FLAC3D showed that considering microseismic damage can better reflect the actual situation of the field. The microfractures in the surrounding rock mainly exhibited mixed failure characteristics, with shear failures localized in certain areas and large fractures in the vault section.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2022)
Article
Construction & Building Technology
Zhonghua Hu, Bangbiao Wu, Nuwen Xu, Kai Wang
Summary: This study investigates the failure mechanism of rock masses in the underground powerhouse caverns of the Baihetan hydropower station and finds that discontinuities significantly affect the stability of rock masses. A risk boundary, affected by discontinuities, is proposed to evaluate roof stability. The study provides valuable insights for the design of excavation and support systems in underground engineering projects.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Article
Construction & Building Technology
Jinyong Zhang, Nuwen Xu, Wei Wu, Peiwei Xiao, Biao Li, Linlu Dong
Summary: This study explores the application of the fast marching method (FMM) to improve the accuracy of microseismic source location in faulted rock masses, showing the potential to enhance location accuracy for P-wave propagation and indicating the need for further improvement.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
