Study on Stability and Control of Surrounding Rock in the Stopping Space with Fully Mechanized Top Coal Caving under Goaf

Fulian He, Bingquan Liu, Deqiu Wang, Dongdong Chen (), Yanhao Wu, Liming Song, Xiang Ma, Qiucheng Ye, Zaisheng Jiang, Fangfang Guo, Weiguang Wang and Yiyi Wu
Additional contact information
Fulian He: School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Bingquan Liu: School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Deqiu Wang: School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Dongdong Chen: School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Yanhao Wu: School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Liming Song: School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Xiang Ma: School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Qiucheng Ye: School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Zaisheng Jiang: School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Fangfang Guo: School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Weiguang Wang: Jinneng Holding Group, Datong 037000, China
Yiyi Wu: School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China

Energies, 2022, vol. 15, issue 22, 1-22

Abstract: Under the condition of fully mechanized top coal caving in close-distance coal seams, the surrounding rock of the stopping space easily loses stability during the withdrawal of mining equipment in the working face because the lower coal seam working face is located under the goaf and the overburden rock has a large range of complex interaction. Field investigation, theoretical analysis, laboratory experiment, similar simulation experiment, numerical simulation, and field industrial tests are used to carry out the research on the stability and control of the surrounding rock in the large section stopping space under the goaf in this paper. The research conclusions are as follows. (1) It is determined that the lower coal seam working face can only stop mining under the goaf, and the reasonable stopping position under the goaf should ensure that the key block fracture line of the main roof is behind the support. (2) The interaction law between the main roof’s key blocks of the upper and lower coal seams is analyzed, and the catastrophic conditions for sliding instability and rotary instability of the main roof’s key blocks of the upper and lower coal seams are obtained. (3) “Anchorage with push and pull equipment-Embedded anchorages and trays” integral anchoring technology is developed. The dimensions of the push and pull equipment are determined. (4) Through numerical simulation of the distribution characteristics of the anchor cable pre-stress field, the asymmetric control scheme of “Partition long and short anchor cables + Integral polyurethane mesh + Embedded anchorages and trays for roof protection” is determined. The rock pressure observation shows that the withdrawal of the working face equipment is implemented safely.

Keywords: close-distance coal seams; stopping space; roof rocks; stability; asymmetric control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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