Abutment Pressure Distribution Law and Support Analysis of Super Large Mining Height Face

Libo Zhang, Wenlong Shen (), Xuelong Li (), Yabo Wang, Qizhi Qin, Xutao Lu and Tianxi Xue
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Libo Zhang: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Wenlong Shen: State and Local Joint Engineering Laboratory for Gas Drainage & Ground Control of Deep Mines, School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Xuelong Li: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Yabo Wang: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Qizhi Qin: Shandong Energy Group Co., Ltd., Jinan 250014, China
Xutao Lu: Shandong Energy Group Co., Ltd., Jinan 250014, China
Tianxi Xue: Jiaojia Gold Mine, Shandong Gold Mining Industry (Laizhou) Co., Ltd., Laizhou 261441, China

IJERPH, 2022, vol. 20, issue 1, 1-16

Abstract: Under the condition of the shallow coal seam, the laws of roof activity after large mining height longwall face mining and prevention measures for large-area roof weighting are problems that need to be solved urgently. In the background of the super large mining height working face in the upper 108 working face of Jinjitan Coal Mine 12-2, the spatial distribution characteristics of the development and change of the mining-induced abutment pressure and the related support design in the 8.2 m super large mining height and fully mechanized mining face were conducted. It reveals the distribution characteristics of the dynamic stress field and internal and external stress fields. The influence range of the abutment pressure of the super high mining height working face was measured on site. The numerical simulation is carried out, the roadway support structure is analyzed, and the improvement measures are proposed. The research results demonstrate that: The influence range of abutment pressure is 234 m, the obvious influence range of the leading pressure is 47–60 m, and the peak position of the influence of the leading pressure is 15–20 m. The 5 m range is the lateral inward stress field of the coal pillar, the 10–15 m range is the outward stress field of the coal pillar, and the 20 m range is the original rock stress field of the coal pillar. Therefore, it is proposed that the reasonable size of the coal pillar for roadway protection is 20–22 m. Adjusting the distance between screw steel and FRP bolts from 1000 mm to 1200 mm, the length of the roof prestressed anchor cable should be appropriately reduced to 5.5–6 m according to the lithology of the roof.

Keywords: super large mining height; abutment pressure; rock pressure behavior; surrounding rock control; support design (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (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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