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Non-destructive testing and pre-warning analysis on the quality of bolt support in deep roadways of mining districts

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International Journal of Mining Science and Technology 2017年第6期27卷 989-998页

作者： Zhang Houquan Miao Xiexing Zhang Guimin Wu Yu Chen Yanlong State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology Xuzhou 221116 China School of Mechanics and Civil Engineering China University of Mining and Technology Xuzhou 221116 China

The bolt support quality of coal roadways is one of the important factors for the efficiency and security of coal production. By means of a self-developed technique and equipment of random non-destructive testing, non-destructive detection and pre-warning analysis on the quality of bolt support in deep roadways of mining districts were performed in a number of mining areas. The measured data were obtained in the detection instances of abnormal in-situ stress and support invalidation etc. The corresponding relation between axial bolt load variation and roadway surrounding rock deformation and stability was summarized in different mining service stages. Pre-warning technology of roadway surrounding rock stability is proposed based on the detection of axial bolt load. Meanwhile, pre-warning indicators of axial bolt load in different mining service stages are offered and some successful pre-warning cases are also illustrated.The research results show that the change rules of axial bolt load in different mining service stages are quite similar in different mining areas. The change of axial bolt load is in accord with the adjustment of surrounding rock stress, which can consequently reflect the deformation and stability state of roadway surrounding rock. Through the detection of axial bolt load in different sections of roadways, the status of real-time bolt support quality can be reflected; meanwhile, the rationality of bolt support design can be evaluated which provides reference for bolting parameters optimization.

关键词： Deep roadways Bolt support quality Random nondestructive testing Surrounding rock stability Prediction and pre-warning

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Abutment pressure distribution for longwall face mining through abandoned roadways

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International Journal of Mining Science and Technology 2019年第1期29卷 59-64页

作者： Yang Li Mingxing Lei Haosen Wang Cheng Li Weiwei Li Yang Tao Jingyi Wang College of Resources and Safety Engineering China University of Mining and Technology Beijing China National Machinery Imp&Exp.Corp

Abutment pressure distribution is different when a longwall panel is passing through the abandoned gate roads in a damaged coal seam. According to the geological condition of panel E13103 in Cuijiazhai Coal Mine in China, theoretical analysis and finite element numerical simulation were used to determine the front pressure distribution characteristics when the longwall face is 70, 50, 30, 20, 10, and 5 m from the abandoned roadways. The research results show that the influence range of abutment pressure is 40 to 45 m outby the face, and the peak value of front abutment pressure is related to the distance between the face and abandoned roadways. When the distance between the longwall face and abandoned roadways is reduced from 50 to 10 m, the front abutment pressure peak value kept increasing. When the distance is 10 m, it has reached the maximum. The peak value is located in 5 to 6 m outby the faceline. When the distance between the longwall face and abandoned roadways is reduced from 10 to 5 m, the front abutment pressure sharply decreases, the intact coal yields and is even in plastic state. The peak value transfers to the other side of the abandoned roadways. The research results provide a theoretical basis for determining the advance support distance of two roadways in the panel and the reinforcement for face stability when the longwall face is passing through the abandoned roadways.

关键词： Abandoned roadways Abutment pressure Theoretical calculation Numerical simulation

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Journal of Mountain Science 2018年第5期15卷 1115-1128页

作者： DONG Chun-liang ZHAO Guang-ming LU Xiao-yu MENG Xiang-rui LI Ying-ming CHENG Xiang Key Laboratory of Safety and High-efficiency Coal Mining Ministry of Education Anhui University of Science and Technology School of Mechanics and Photoelectric Physics Anhui University of science and Technology School of Mining and Safety Anhui University of Science and Technology

The unloading effect of the excavation of deep roadways has been considerably studied, but most research methods have been limited to numerical simulations and field measurements. Only a few have adopted experimental methods for similar simulations. On the basis of the theory of mechanics,the testing system is designed considering initial geostress and dynamic unloading. The system includes an impact unloading gear and in-situ stress loading equipment, and a designed three-link structure and the impact hammer can effectively realize the dynamic excavation of roadways.Meanwhile, a cyclic excavation similar simulation experiment on a deep roadway is conducted in a laboratory. The testing system and the relevant monitoring facilities are utilized, and the unloading effect inside the surrounding rock under the cyclic dynamic excavation is studied. Results show that the cyclic dynamic excavation causes significant unloading only in the nearby rock mass, and the unloading indicators show nonlinear changes.Moreover, when the lateral pressure coefficient is 1.2,the damage is concentrated on both roadsides due to the excavation unloading. Meanwhile, the damage gradually decays as the span increases.

关键词： Excavation unloading in deep roadways Unloading effect Damage of surrounding rock Circular excavation Unloading index

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Stability of roadways in coalmines alias rock mechanics in practice

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Journal of Rock Mechanics and Geotechnical Engineering 2010年第3期2卷 281-288页

作者： Richard nupárek Petr Koneny Institute of Geonics Academy of Sciences of Czech RepublicBrno 60200Czech Republic

This paper describes the procedures for design of supports and stabilization measures in the roadways.The procedures are based on the system developed in Ostrava-Karvina coal basin in Czech Republic.The calculation of load bearing capacity of roadway supports contains the period of roadway construction and mining in the vicinities,based on the size of the natural rock arch.The loading of supports during mining comes from a stress wave in the rock mass in the forefront of coalface and the caving area of mined-out panel.The input data for the calculation method are deduced according to in-situ measurements of convergence and displacement in the roadways.

关键词： coalmines roadways stability support bolting

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