Caving thickness effects of surrounding rocks macro stress shell evolving characteristics

Journal of Coal Science and Engineering (China) - Tập 15 - Trang 188-192 - 2009
Guang-xiang Xie1, Ke Yang1
1Key Laboratory of Coal Mine Safety and Efficiently Caving of Ministry of Education, Anhui University of Science and Technology, Huainan, China

Tóm tắt

In order to explore the influence of different caving thicknesses on the MSS distribution and evolving characteristics of surrounding rocks in unsymmetrical disposal and fully mechanized top-coal caving (FMTC), based on unsymmetrical disposal characteristics, the analyses of numerical simulation, material simulation and in-situ observation were synthetically applied according to the geological and technical conditions of the 1151(3) working face in Xieqiao Mine. The results show that the stress peak value of the MSS-base and the ratio of MSS-body height to caving thickness are nonlinear and inversely proportional to the caving thickness. The MSS-base width, the MSS-body height, the MSS-base distance to working face wall and the rise distance of MSS-base beside coal pillar are nonlinear and directly proportional to the caving thickness. The characteristics of MSS distribution and its evolving rules of surrounding rocks and the integrated caving thickness effects are obtained. The investigations will provide lots of theoretic references to the surrounding rocks’ stability control of the working face and roadway, roadway layout, gas extraction and exploitation, and efficiency of caving, etc.

Tài liệu tham khảo

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Thông tin
Thông tin xuất bản

Journal of Coal Science and Engineering (China)

Tập 15

188-192

Thông tin tác giả