Article
Engineering, Chemical
Shunjie Huang, Guangming Zhao, Xiangrui Meng, Xiang Cheng, Wensong Xu, Gang Liu, Shikui Zhu
Summary: This study comprehensively investigated the coal-wall-slicing mechanism at the tunnel excavation working face under a soft and extra-thick coal roof, and proposed the combined supporting technology of coal wall water injection + metal roof frame. The results showed that this technology effectively controlled the deformation of the roadway, reduced the repair rate, and improved the efficiency of excavation, resulting in significant economic benefits.
Article
Engineering, Mechanical
Yanpei An, Nong Zhang, Yiming Zhao, Zhengzheng Xie
Summary: Coal roof roadways are more sensitive to stress field changes during excavation and mining, leading to security risks. Suggestions for improved support were proposed to reduce damage height and increase roadway stability in thick-coal-roof roadways.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Geosciences, Multidisciplinary
Xiang He, Shuxin He, Yongbo Cai, Ruiyang Xu, Ke Yang
Summary: The methods of numerical simulation and on-site measurement were used to analyze reasonable coal pillar width and roadway support in an isolated panel of an extra-thick coal seam. It was found that a 6m pillar can meet the load requirements of overlying strata and ensure an undamaged and controllable environment for the roadway. The proposed joint control technology, including asymmetric anchor cables, high intensity anchor cables, and coal pillar grouting, achieved good control effects on-site.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Construction & Building Technology
Hai Rong, Liting Pan, Xiaoyan Li, Ming Wang, Zeliang Qu, Mengsheng Lu, Kaipeng Guo
Summary: By establishing models and numerical simulations, analyzing the support effect and optimization parameters, the safety problem of roadway support in coal mines under high stress conditions has been solved, and suggestions and measures for improving the support effect have been proposed.
ADVANCES IN CIVIL ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Xiuchang Shi, Guangluo Lyu
Summary: Bed separation water inrush disasters frequently occur in the Jurassic coalfield of Huanglong, China, posing serious threats to coal mining safety. This study collected data from multiple instances of bed separation water inrush (BSWI) in the Cuimu coal mine and summarized the characteristics of BSWI. By analyzing hydrogeological conditions, hydrochemical characteristics, field detection of a water-conducting fractured zone, and groundwater level monitoring, the source of water inrush, water-conducting channel, and dynamic response of the aquifer water level were studied. The research results are crucial for preventing BSWI disasters and ensuring the safety of coal mine production.
Article
Multidisciplinary Sciences
Ce Jia, Sheng Li, Chaojun Fan, Mingkun Luo, Lijun Zhou, Ziang Pu, Lei Yang
Summary: In this study, theoretical analysis, numerical simulation, and orthogonal matrix analysis methods were used to investigate the roof deformation and support parameter optimization of the top coal roadway in thick seam. Based on the established structural and mechanical models, the deformation coefficient T-K was defined and the discriminant conditions for roadway roof stability under different deformation modes were obtained. Considering the characteristics of coal-rock fragmentation and large roof deformation, a combined support method using high prestressed long and short anchor cables was proposed. Through the orthogonal matrix analysis method, the optimization of supporting parameters was conducted, leading to a significantly reduced analysis amount and the determination of the optimal supporting scheme. Compared to unsupported roadways, the deformations of the roof and sides were reduced by 27.27% and 45.24% respectively, while the tensile failure volume decreased by 54.66%. This research effectively controls the top coal roadway in thick seam and provides guarantee for high yield and high efficiency in mining operations.
SCIENTIFIC REPORTS
(2023)
Article
Mining & Mineral Processing
Hongfei Duan, Lijuan Zhao, Haiyan Yang, Yao Zhang, Hongchun Xia
Summary: In this study, a 3D model of top coal caving surface space was established using drilling method, enabling accurate estimation of the top caving angle on site. The findings reveal differences in coal-rock caving characteristics under different geological structures, and a relationship between the two indexes was fitted with an exponential decay function.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Ce Jia, Sheng Li, Chaojun Fan, Mingkun Luo, Lijun Zhou, Ziang Pu, Lei Yang
Summary: This study focuses on the large deformation and difficult control of mining roadway water drenching in a thick coal seam. The principle of double-arch zoning cooperative surrounding rock control is investigated using theoretical analysis, numerical simulation, and industrial experiment. A water-mechanical-damage coupling model is constructed for the surrounding rock of a coal seam roadway and the optimal support scheme is determined to effectively control the surrounding rock.
Article
Engineering, Geological
Qi Wang, Zhenhua Jiang, Bei Jiang, Manchao He, Jun Yang, Haojie Xue
Summary: Coal mining in western China faces challenges such as extra-thick coal seams and extra-thick hard roof, leading to delayed collapse of the roof, resulting in large-suspended areas and frequent dynamic disasters. This study proposes an integrated ground control method for roadway with hard roof, including roof cutting pressure release and energy-absorbing reinforcement. The method is applied to the #122108 working face of Caojiatan coal mine, and its effectiveness is verified through stress reduction analysis, numerical experiments, and field monitored data. The results demonstrate significant reduction in stress and deformation, validating the control mechanism and design parameters of the method.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Environmental Sciences
Chang Liu, Pingsong Zhang, Duoxi Yao, Yuanchao Ou, Yutong Tian
Summary: This paper used the dual-mode parallel electrical method to dynamically monitor the overlying rock in a shallow and large mining height working face, investigating the development of water-flowing fractured zones. The maximum height of the water-flowing fractures was determined to be 122 meters through apparent resistivity monitoring.
ENVIRONMENTAL EARTH SCIENCES
(2022)
Article
Construction & Building Technology
Lianpeng Dai, Yishan Pan, Zhonghua Li, Aiwen Wang, Yonghui Xiao, Feiyu Liu, Tianwei Shi, Wenhong Zheng
Summary: Rockbursts are a severe dynamic disaster in mines, globally recognized as one of the most serious incidents. By using stability theory, this study obtained critical indexes for remotely triggered rockbursts, including key stress indicators for surrounding rock softening and fracture occurrence. Through quantitative calculations using typical case histories, the main influencing factors and laws of rockbursts were determined, laying a foundation for the development of quantitative criteria for rockbursts.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2021)
Article
Engineering, Geological
Wei Weijie, Yang Shengli, Li Meng, Zhang Jinwang, Wei Chuanbo
Summary: In this study, the distribution of top coal block sizes in longwall top coal caving (LTCC) with an extra-thick seam was measured, and the mixed motion mechanisms of top coal and gangue blocks were investigated through discrete element calculations and physical experiments. The results showed that the height-width ratio of the drawing body increased with increasing drawing height, and the rotation points and angles of the top coal boundary changed throughout the drawing process. Measures to improve top coal recovery and a fine caving technology were proposed, providing new approaches for high resource recovery mining in LTCC with an extra-thick seam.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Engineering, Environmental
Wenli Zhai, Fulian He, Liang Li, Jiayu Song, Xuhui Xu, Kai Lv, Xiaobin Li, Deqiu Wang, Jianlong Zhang
Summary: The roof cutting pressure relief of small pillar in super high coal seam in along-gob roadway driving is studied through field measurement, theoretical analysis, numerical simulation, and field test at Yongdingzhuang Coal Company. The study reveals that the strong strata behavior of along-gob roadways is influenced by various factors, such as high stress zone near the coal pillar, mining thickness, immediate roof thickness, main roof hardness, rotating space, and the distance of the main roof fracture. The study also proposes a precise hydraulic roof fracturing scheme and a supporting technique for stability. This research provides valuable insights for surrounding rock control of small pillar along-gob roadways.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Geochemistry & Geophysics
Chong Jia, Xingping Lai, Feng Cui, Shuai Zhang, Jingxuan Sun, Mengqi Tian
Summary: This paper investigates the mechanism and regulation of overburden breakage induced by mining from the residual coal seam to the mined-out area. The research reveals the mechanism of rock burst and determines the impact risk area through comprehensive evaluation. Moreover, a roof pressure relief and impact prevention control method using large-diameter empty hole combined with advanced deep hole blasting was proposed and verified, showing its effectiveness in safe and efficient mining.
Article
Multidisciplinary Sciences
Xiugang Liu, Fei Wei, Zhixiang Tan, Zaibing Jiang, Yi Wang, Jie Zhang
Summary: This study investigates the change law of the surface subsidence coefficient under the condition of thick coal seam layered mining. UDEC numerical simulation software is used to simulate the variation of surface subsidence coefficient after multiple layers of mining. The results show that the surface subsidence coefficient presents a segmented characteristic as the cumulative mining thickness increases.
SCIENTIFIC REPORTS
(2023)
Article
Energy & Fuels
Ziwei Ding, Jindui Jia, Ruimin Feng
ENERGY SCIENCE & ENGINEERING
(2019)
Article
Engineering, Geological
Ruimin Feng, Shengnan Chen, Steven Bryant
ROCK MECHANICS AND ROCK ENGINEERING
(2020)
Article
Environmental Sciences
Hong Yan, Lipeng Tian, Ruimin Feng, Hani Mitri, Junzhi Chen, Kang He, Yuan Zhang, Shunchao Yang, Zhijun Xu
SCIENCE OF THE TOTAL ENVIRONMENT
(2020)
Article
Construction & Building Technology
Hong Yan, Jixiong Zhang, Ruimin Feng, Wei Wang, Yiwen Lan, Zhijun Xu
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2020)
Article
Metallurgy & Metallurgical Engineering
Yan Hong, Tian Li-peng, Feng Rui-min, Hani Mitri, Chen Jun-zhi, Zhang Bo
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2020)
Article
Energy & Fuels
Ruimin Feng, Jun Liu, Yongming He, Shengnan Chen
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2020)
Article
Energy & Fuels
Zequan Li, Ruimin Feng, Jun Liu, Rohit Pandey
Summary: This study proposes a simplified pulse decay method with only a single downstream reservoir to replicate in situ conditions for reservoir fluid flow and determine the effective porosity and permeability of core samples accurately. Experimental results demonstrate that the single downstream reservoir PDM can better simulate in situ fluid flow behavior and achieve accurate measurements, extending the application of the transient technique.
ENERGY SCIENCE & ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Chuanming Li, Nan Liu, Wanrong Liu, Ruimin Feng
Summary: The study shows that the presence of water can reduce the elastic limit of rock samples, making the rock more susceptible to deformation and damage. The higher the water content, the smaller the damage energy of the rock samples.
Article
Geochemistry & Geophysics
Chunlei Zhang, Yun Dong, Ruimin Feng, Ningbo Peng, Jihua Zhang, Jingke Wu, Wei Shen
Summary: This study focused on the crack propagation law and failure characteristics of coal-rock combined body (CRCB) with prefabricated fissure. A numerical model was established to simulate the dynamic change process under uniaxial compression and the influence of the inclination angle of the fracture on the fracture expansion and failure characteristics of CRCB.
Article
Geochemistry & Geophysics
Nan Liu, Chuanming Li, Ruimin Feng, Xin Xia, Xiang Gao
Summary: This study explored the influence of moisture content on the mechanical properties of coal and rock burst tendency through multiple measurement techniques. The results showed that with the increase in moisture content, the peak strength and elastic modulus of coal samples decrease while the peak strain increases, and the failure mode of the coal sample shifts towards tensile failure. The findings provide a theoretical reference for studying the fracture instability of moisture-bearing coal and preventing coal and rock burst through the water injection technique.
Article
Energy & Fuels
Ruimin Feng, Jun Liu, Michelle L. Bernhardt-Barry, Shengnan Chen
Summary: The study introduces a novel pressure transient technique to accurately determine the permeability of unconventional gas reservoirs, validated through numerical simulations and experimental tests for high accuracy and efficiency. This provides a valuable tool for understanding in-situ gas flow behavior in tight-structure gas reservoirs.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Chuanming Li, Xin Xia, Ruimin Feng, Xiang Gao, Xiao Chen, Gang Lei, Jiankui Bai, Bochao Nie, Zhengrong Zhang, Baoyou Zhang
Summary: Traditional rock bolt inspection methods are limited and destructive. Non-destructive testing based on stress wave method enables fast and convenient quality detection. By applying axial loads on rock bolts and collecting stress wave signals, the study uses VMD decomposition and Hilbert-Huang signal processing to analyze the characteristics of stress waves. The results show that the stress wave amplitude decreases gradually with increasing axial load, and the method of calculating axial load based on stress wave time-domain amplitude is accurate and reliable.
Article
Geochemistry & Geophysics
Qingfeng Hu, Ximin Cui, Wenkai Liu, Ruimin Feng, Tangjing Ma, Debao Yuan
Summary: A novel time function is proposed in this research to predict surface mining subsidence, and its reliability and improved accuracy were verified through experiments conducted on a coal mine dataset.
Article
Engineering, Multidisciplinary
Chunlei Zhang, Y. P. Chugh, Ruimin Feng, Yong Zhang, Wei Shen, Jingke Wu, Yushun Yang
Summary: This study evaluated the stress redistribution effects of PVCS on PTCS using numerical modeling, finding that mining depth, mining height, and inter-burden rock mass properties affect stress relief angle and coefficient. As the face advanced, stress relief varied in different locations of the PTCS.
CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES
(2021)
Article
Engineering, Geological
Chunlei Zhang, Ruimin Feng, Xibin Zhang, Wei Shen
Summary: This study focused on the floor failure mechanism and crack evolution in the mining of short distance coal seams group in Xinghua coal mine. The results showed that as the upper coal seam advances, the pressure relief angle of roof and floor gradually decreases, and the pressure relief range and floor failure depth increase. The mining-induced fractures in the floor were found to be distributed in the shape of an O ring, with the O-shaped crack circle moving forward as the working face advances.
GEOTECHNICAL AND GEOLOGICAL ENGINEERING
(2021)