Study on Evolution of Front Abutment Pressure at Working Face in Repeated Mining of Close-Distance Coal Seams

Fulian He, Liang Li (), Kai Lv, Binbin Qin, Xuhui Xu, Qing Ma and Yongqiang Chen
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Fulian He: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Liang Li: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Kai Lv: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Binbin Qin: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Xuhui Xu: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Qing Ma: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Yongqiang Chen: Department of Civil Engineering, Lakehead University, Thunder Bay, ON P7B5E1, Canada

Sustainability, 2022, vol. 14, issue 19, 1-17

Abstract: In order to determine the reasonable width of a stopping coal pillar in close-distance coal seams, the evolution law of front abutment pressure of the working face with repeated mining was studied. Based on the actual engineering project, we conducted field measurement, theoretical analyses, numerical simulations and a physical similarity simulation test to study. The results show that: (1) according to field measurement, the influence range of front abutment pressure increases from 60 m to 75 m with repeated mining; (2) according to theoretical analysis, the arch height and span are negatively and positively correlated with the influence range of front abutment pressure, respectively; (3) with repeated mining, the arch height increased to 165 m, the arch span to 235 m and the influence range to 83.5 m by 14.5 m relative to that before repeated mining; (4) if it is necessary to ensure that the main roadway is less affected by the mining stress, the width of the stopping coal pillar in 2214 working face should be greater than 80 m. The influence range of front abutment pressure increases obviously with repeated mining in close-distance coal seams. The study provides a reference for similar engineering projects.

Keywords: close-distance coal seams; stress arch under nonlinear load; front abutment pressure; stopping coal pillar (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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