Article
Construction & Building Technology
Chao Zhang, Gaohan Jin, Chao Liu, Shugang Li, Renhui Cheng, Xinglong Wang, Xiangzhen Zeng
Summary: This study investigates the application of microseismic monitoring technology in coal mine safety monitoring, revealing the failure mechanism and energy conversion in coal-rock mass, and verifies the relationship between a new rockburst prediction parameter and microseismic energy through physical experiments. The results show that the new model can effectively assess the stability of coal-rock mass to a certain extent.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2021)
Article
Engineering, Geological
Longyong Shu, Zhengshuai Liu, Kai Wang, Nannan Zhu, Jian Yang
Summary: Microseismic monitoring technique was used to analyze microseismic signals in coal mines. Different microseismic signals were classified using the LSTM network. The results showed that the LSTM classification had the lowest loss value and highest accuracy rate. The identified coal fracture microseismic events had a good sequential response to gas concentration, which could be used to warn the outbursts in advance.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
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
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
Geochemistry & Geophysics
Huicong Xu, Xingping Lai, Shuai Zhang, Pengfei Shan, Zheng Wu, Haidong Xu, Rui Bai, Qifeng Guo
Summary: The study found that the microseismic activity in Wudong Coal Mine is mainly stress migration type, with the sandwiched rock pillar as the primary cause of rockburst. Precursory indexes of rockburst were proposed based on time scale and strength index, determining that rockburst will occur within 19 days after entering the early warning period.
Article
Geochemistry & Geophysics
Huicong Xu, Xingping Lai, Shuai Zhang, Pengfei Shan, Zheng Wu, Haidong Xu, Rui Bai, Qifeng Guo
Summary: The study found that the microseismic activity at Wudong Coal Mine is mainly of stress migration type, with the sandwiched rock pillar as the primary inducement of rockburst. Precursory indexes of rockburst were proposed based on time scale and strength index, allowing for prediction of rockburst occurrence. The risk of rockburst is positively correlated with the decline rate of energy index, the growth rate of cumulative apparent volume, and Schmidt.
Article
Geochemistry & Geophysics
Kai Zhan, Xiaotao Wen, Xuben Wang, Chao Kong
Summary: Accurate assessment of stress concentration in surrounding rock is crucial for safety in coal mines. Traditional methods are not always accurate, so we propose a novel approach using monitoring while drilling technology. By combining microseismic monitoring and coal sample collection, we characterize stress concentration using various indices. Our approach is validated by comparing data from stress gauges and conventional methods. Results suggest that this approach provides a reliable and effective alternative for large-diameter drilling, enhancing safety in rockburst-prone coal mines.
JOURNAL OF GEOPHYSICS AND ENGINEERING
(2023)
Article
Geochemistry & Geophysics
Shuang Gong, Yi Tan, Wen Wang
Summary: The study proposed a deep neural network prediction model based on dropout and improved Adam algorithm for accurate and reliable coal bump prediction. The model demonstrated effectiveness and correctness in predicting coal bump disasters, providing a scientific basis for similar projects.
Article
Energy & Fuels
Zhenlei Li, Shengquan He, Dazhao Song, Xueqiu He, Linming Dou, Jianqiang Chen, Xudong Liu, Panfei Feng
Summary: This study investigates microseismic precursors in a steeply inclined coal seam with high rockburst risk, proposing quantification parameters and an early warning method. Results show that specific energy and event count variations can be precursors for rockburst, and spatial parameters correlate with stress concentration and rockburst risk areas. The method can effectively identify potential rockburst risks and areas for targeted mitigation measures.
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
Energy & Fuels
Duo Zhang, Xiaoxin Cen, Weifeng Wang, Jun Deng, Hu Wen, Yang Xiao, Chi-Min Shu
Summary: This study conducted experiments on coal spontaneous combustion and analyzed characteristic gas parameters, leading to the division of coal spontaneous combustion into seven stages. By providing early warning criteria and characteristic gas parameter threshold values, the degree of coal spontaneous combustion in the working face was successfully predicted, ensuring safe evacuation.
Article
Engineering, Geological
Dexing Li, Enyuan Wang, Xiaojun Feng, Dongming Wang, Xin Zhang, Yunqiang Ju
Summary: It was found that weak currents can be generated from coal and rock materials under a load. Through experiments and field tests, the response characteristics of weak currents to coal failure and mine seismicity were investigated. The results showed that the weak current increases linearly with stress and strain in the elastic deformation stage and can be used as a precursor of coal failure. The weak current measured in an underground coal mine also responds well to mine seismicity, and its continuously accelerated increase can be used as a precursor of mine seismicity.
ENGINEERING GEOLOGY
(2023)
Article
Acoustics
Wenlong Zhang, Tianhong Huo, Chen Li, Cunwen Wang, Xiaocheng Qu, Chongwei Xin
Summary: This study explores the potential role of microseismic (MS) events in rock burst monitoring of heading face by analyzing their basic characteristics, providing a basis for the development of this monitoring method.
SHOCK AND VIBRATION
(2021)
Article
Mathematics, Interdisciplinary Applications
Jiliang Kan, Linming Dou, Jiazhuo Li, Shikang Song, Kunyou Zhou, Jinrong Cao, Jinzheng Bai
Summary: This paper investigates the waveform characteristics and focal mechanisms of different microseismic events induced by blasting and mining in coal mines using multifractal and moment tensor inversion methods. The results show that the multifractal parameters can be used to discriminate different microseismic events, and the blasting schemes have a significant influence on the waveform characteristics. Furthermore, the focal mechanisms of microseismic events were calculated, revealing the dominant mechanisms and their relationships with inducing factors and occurrence processes.
FRACTAL AND FRACTIONAL
(2022)
Article
Environmental Sciences
Minglei Zhai, Haibo Bai, Luyuan Wu, Guangming Wu, Xianzhen Yan, Dan Ma
Summary: The working face in North China Coalfield is seriously threatened by a high-water pressure limestone aquifer in the coal seam floor. Mine water control has become a major problem in coal mine production. This study focuses on grouting transformation for limestone aquifer in the Luxi coal mine. Results showed that the traditional grouting method had limited effectiveness and could change water flow paths. Poorly sealed drill holes also led to changes in the position of water-rich areas. A secondary grouting-reinforcement method was proposed to enhance grouting efficiency.
ENVIRONMENTAL EARTH SCIENCES
(2022)
Article
Ophthalmology
Jinping Hu, Jun Liu, Jingting Xia, Jingyu Yan, Zheng Liu, Dan Ma
Summary: This study proposes a three-step sterilization method for GTP and analyzes the sterilization effects. The results show that the method is effective in eliminating bacteria, and the use of ofloxacin is recommended to prevent the transmission of pathogens.
INDIAN JOURNAL OF OPHTHALMOLOGY
(2022)
Article
Automation & Control Systems
Dan Ma
Summary: This article examines the delay range for robust consensus of unstable first-order agents using proportional and proportional-derivative control protocols subject to time-varying delays. The results show that the agent dynamics and the graph connectivity may limit the range of tolerable delays, and incorporating the delay variation rate in the design of the PD control protocol can expand the range of achievable robust consensus.
IEEE TRANSACTIONS ON AUTOMATIC CONTROL
(2022)
Article
Physics, Multidisciplinary
Xuyang Shi, Ming Li, Yu Han, Qingxiang Cai, Zhanqing Chen, Yanlong Chen, Dan Ma
Summary: In this study, numerical simulations were conducted to investigate the mechanical properties of water-sediment two-phase flow in smooth and rough fractures, as well as the influence of fracture surface morphology on sediment volume concentration, particle size, and mass density. The results showed that pressure gradient, sediment concentration, particle size, and mass density exhibited approximate linear relationships in smooth fractures, while they were significantly affected by sediment properties in rough fractures.
FRONTIERS IN PHYSICS
(2022)
Article
Mathematics
Minglei Zhai, Dan Ma, Haibo Bai
Summary: This paper studies the diffusion mechanism of slurry in horizontal fractures of fractured aquifers, establishes a one-dimensional seepage grouting theoretical model, and proposes a grouting scheme for water disaster prevention in coal mine floor. The rationality and effectiveness of the grouting scheme were verified through experiments.
Article
Engineering, Multidisciplinary
Junzheng Yang, Song Wang, Chunfeng Zheng, Gang Feng, Guanghao Du, Chaodong Tan, Dan Ma
Summary: This paper proposes a fault diagnosis method for the operation of electric submersible pump (ESP) wells based on SPC rule and prior knowledge fusion. The research and application demonstrate that this method is efficient and accurate in diagnosing faults.
MATHEMATICAL PROBLEMS IN ENGINEERING
(2022)
Article
Engineering, Geological
Dan Ma, Hongyu Duan, Jixiong Zhang, Xianwei Liu, Zhenhua Li
Summary: A one-dimensional radial three-phase flow model of water-rock-silt was established to investigate the hydraulic characteristics of fault rock during water-silt inrush. The accuracy of the proposed model was verified through laboratory tests and the temporal-spatial distribution of hydraulic properties was obtained.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Infectious Diseases
Haixin Liu, Xiangrui Yin, Haolun Tian, Yudong Qiu, Zhenyu Wang, Jing Chen, Dan Ma, Bing Zhao, Qian Du, Dewen Tong, Yong Huang
Summary: This study investigated the prevalence of PEDV in mid-west China and characterized the genetic and pathogenic features of the pandemic strains. The results showed that the SXSL strain is a recombinant strain and has multiple amino acid indels and mutations in its S protein compared to the representative strains. Furthermore, the study revealed that the SXSL S protein enhances the infectivity and pathogenicity of PEDV.
TRANSBOUNDARY AND EMERGING DISEASES
(2022)
Article
Mining & Mineral Processing
Chong Li, Sifeng He, Wentao Hou, Dan Ma
Summary: This paper innovatively studies the rational water-cement ratio of traditional bulk static cracking agent (BSCA) and the immersion soaking time of rolled static cracking agent (RSCA) under the condition of controlling temperature. The research results show that the rational water-cement ratio for BSCA application is 0.3, and the rational immersion time of RSCA is 2-2.5 min. RSCA has better hole spraying prevention than BSCA under larger bore diameters.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2022)
Article
Business
Wenqi Duan, Joseph David Madasi, Adnan Khurshid, Dan Ma
Summary: This study investigates the importance of industrial structure conditions in economic resilience by developing a novel multi-dimensional nonlinear model. The findings reveal that industrial network characteristics, increased FDI, and stronger interaction can enhance economic resilience, while exchange rate volatility impedes industrial growth and suppresses system resilience.
TECHNOLOGICAL FORECASTING AND SOCIAL CHANGE
(2022)
Article
Mechanics
Yiming Wang, Yiying Feng, Hai Pu, Qian Yin, Dan Ma, Jiangyu Wu
Summary: This study focuses on the order of a fractional dashpot with 1 < beta < 2, which has the tangible physical meaning of a viscoinertial element. It presents the unique advantages of the creep constitutive model based on fractional calculus in describing creep characteristics and extends the theoretical content of the fractional dashpot with the viscoinertial element (1 < beta < 2).
Article
Construction & Building Technology
Jiangyu Wu, Hong S. Wong, Hao Zhang, Qian Yin, Hongwen Jing, Dan Ma
Summary: This study explores a method of strengthening cemented rockfill by using well-graded gangue and partially replacing Portland cement with fly ash and a premixed low-alkalinity activator. The research investigated the effects of activator dosage and curing time on the mechanical properties, composition, and microstructure of cemented rockfill. Results show improved performance with low cement content and the use of a low-cost activator. The addition of premixed activator to fly ash enhanced the formation of specific minerals and caused densification of the microstructure. The study reveals an effective and low-cost method for recycling mining wastes and reducing cement.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Energy & Fuels
Dan Ma, Hongyu Duan, Qiang Li, Jiangyu Wu, Wen Zhong, Zhen Huang
Summary: A radial water-rock mixture flow model was established to study the evolution laws of water inrush and rock instability in mining tunnel construction. Through the model, temporal-spatial evolution laws of different hydraulic and mechanical properties were analyzed, and the model's applicability and limitations were discussed by comparing it with existing models.
INTERNATIONAL JOURNAL OF COAL SCIENCE & TECHNOLOGY
(2023)
Proceedings Paper
Automation & Control Systems
Yingying Liu, Dan Ma
Summary: This paper discusses the feasible region of PI control parameters for first-order nonlinear stochastic time-delay systems. The system can robustly asymptotically track a set-point under any PI control parameters within the feasible region. The paper proposes a new algorithm to compute the feasible region and an improved algorithm to reduce time complexity. Simulation examples demonstrate the feasibility and effectiveness of the proposed algorithms.
Proceedings Paper
Automation & Control Systems
Xueyan Ma, Yaopo Li, Dan Ma
Summary: This paper investigates delay range optimization for robust containment control of first-order multi-agent systems over directed graphs to find the maximum allowable delay range within which the system can achieve containment robustly under certain control protocols. The results show that the position of the pole and the network connectivity will affect the delay bound.
