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综采工作面采动应力与断层活化相互作用规律及断层倾角影响

Interaction law between mining stress and fault activation and the effect of fault dip angle in longwall working face.

作者信息

Tang Long, Tu Shihao, Tu Hongsheng, Zhang Lei, Miao Kaijun, Zhao Hongbin, Ma Jieyang

机构信息

School of Mines, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China.

Stae Key Laboratory for Fine Expeloration and Intelligent Development of Coal Resources, Xuzhou, 221116, Jiangsu, China.

出版信息

Sci Rep. 2024 Oct 27;14(1):25654. doi: 10.1038/s41598-024-75878-0.

DOI:10.1038/s41598-024-75878-0
PMID:39463409
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11514261/
Abstract

Study of the interaction between fault activation and mining stress evolution in the longwall working face is helpful to provide a targeted area for fault type heavy mine pressure disaster control. Combining theoretical analysis, physical and numerical simulation, the mechanical mechanism of fault activation is analyzed, the interaction law between mining stress and fault activation is studied, and the influence of fault dip angle on the evolution of fault activation and mining stress is discussed. The minimum critical dip angles α of normal and reverse fault activation are π/4 + φ/2 and π/4-φ/2, respectively. During the mining process, the activation position of the fault surface, the peak values of stress and displacement gradually increase and transfer from the high position of the fault to the low position, and the peak value of the advance abutment pressure reaches the maximum at the fault. The advancing distance of the working face required for fault activation gradually decreases with the decrease of the fault dip angle, and the peak elevation area of the working face gradually increases with the decrease of the fault dip angle. Combined with the on-site microseismic monitoring results, it can be seen that when the working face is about 20 m away from the fault, the stress and energy increase sharply, which is the main control area of the impact disaster.

摘要

研究长壁工作面断层活化与采动应力演化之间的相互作用，有助于为断层型冲击地压灾害防治提供针对性区域。结合理论分析、物理模拟和数值模拟，分析了断层活化的力学机制，研究了采动应力与断层活化之间的相互作用规律，并探讨了断层倾角对断层活化和采动应力演化的影响。正断层和逆断层活化的最小临界倾角α分别为π/4 + φ/2和π/4 - φ/2。在开采过程中，断层面的活化位置、应力和位移峰值逐渐增大，并从断层高位向低位转移，超前支承压力峰值在断层处达到最大。断层活化所需的工作面推进距离随断层倾角减小而逐渐减小，工作面峰值升高区域随断层倾角减小而逐渐增大。结合现场微震监测结果可知，当工作面距断层约20 m时，应力和能量急剧增加，此处为冲击灾害的主要控制区域。

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