Regional Division and Its Criteria of Mining Fractures Based on Overburden Critical Failure

Erhu Bai, Wenbing Guo, Yi Tan, Mingjie Guo, Peng Wen, Zhiqiang Liu, Zhibao Ma and Weiqiang Yang
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Erhu Bai: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
Wenbing Guo: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
Yi Tan: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
Mingjie Guo: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
Peng Wen: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
Zhiqiang Liu: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
Zhibao Ma: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
Weiqiang Yang: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China

Sustainability, 2022, vol. 14, issue 9, 1-15

Abstract: Mining fracture is the key factor in realizing water-conservation mining, stability evaluation of coal mining subsidence areas, and accurate restoration of the surface eco-environment. To clarify, the evolution and distribution of mining fractures, based on the key strata theory and the mining degree of overburden failure, the contact state of rock stratum after overburden critical failure was analyzed, the formation mechanism of “saddle shaped” water conducting fracture zone was revealed, and the permanent mining fractures were determined to be primarily concentrated in the overburden structure at the boundary of the working face. According to the shear test of sandstone in the fracture zone, the damage degree of the rock sample was positively correlated with shear stress, and the overburden structure exhibited no instability. Based on the distribution of mining fractures, the fracture zone was divided into the original fracture, tensile fracture, structural void, and void compaction areas in the horizontal direction. The structural void area had the largest residual deformation in the goaf. A regional division method based on overburden critical failure was proposed and applied in engineering by using surface movement monitoring. The results showed that the surface subsidence near the boundary of working face was greater than that in the middle, and the residual surface deformation in the goaf was closely related to the mining time, which has long-term characteristics. The rationality of the regional division method of mining fractures was also verified.

Keywords: overburden critical failure; mining fractures; overburden structure; regional division; strata movement (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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