Fracture Evolution Characteristics and Deformation Laws of Overlying Strata during the Initial Period of Longwall Mining: Case Study

Chuantian Li, Yongliang He (), Xiaoyuan Sun and Yuping Fu
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Chuantian Li: School of Engineering for Safety and Emergency Management, Taiyuan University of Science and Technology, Taiyuan 030024, China
Yongliang He: School of Engineering for Safety and Emergency Management, Taiyuan University of Science and Technology, Taiyuan 030024, China
Xiaoyuan Sun: School of Engineering for Safety and Emergency Management, Taiyuan University of Science and Technology, Taiyuan 030024, China
Yuping Fu: School of Engineering for Safety and Emergency Management, Taiyuan University of Science and Technology, Taiyuan 030024, China

Sustainability, 2023, vol. 15, issue 11, 1-23

Abstract: Coal mining causes overlying rocks to collapse and be destroyed. Overburdened crevasses provide a channel for gas discharge, which is a serious safety hazard. To study the evolution characteristics and migration pattern of overburdened fissures during the initial mining period, the 24207 working face of the Shaquan mine was used as a research object. Through similar physical simulation tests, a mechanical model of the mining structure during the initial mining period was constructed to explore the factors influencing the movement pattern of the overburden strata during the initial mining period. The research results show that the evolution of mining-induced fractures in the overburdened strata in the initial mining period mainly experience the slow and rapid rising stages of the fracture dimension, while the stable mining period is in the stable development stage of the fracture dimension. The research results will help supplement and improve the theory of gas disaster prevention and comprehensive resource utilization in the initial mining stage under the mining conditions of high gas and low permeability coal seam group, achieve the goal of “coal and gas co-mining”, and ensure the safe and efficient production of mines.

Keywords: longwall mining; overburden fractures; gas hazard; physical simulation; initial mining period (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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