Coal Engineering ›› 2024, Vol. 56 ›› Issue (4): 73-78.doi: 10. 11799/ ce202404011

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Coal bump prevention method for coal seams with large thrust fault in Yima mining area#br#

  

  • Received:2023-08-22 Revised:2024-02-19 Online:2023-04-20 Published:2024-12-09

Abstract:

The activation of large faults leads to frequent occurrence of coal bump disasters in coal mine. Ensuring sufficient distance between the mining face and the fault is one of the key measures to control such coal bump disasters. Taking the large thrust fault in Yima mining area as an example, this paper analyzes the spatial shape and movement characteristics of the fault and their correlation with coal bump based on geological borehole detection and settlement observation. Based on the induction of coal bump behavior and similarity simulation of fault slip, a reverse proportional relationship between the number of coal bump and distance of face-fault is proposed, and the safe distance between the working face and the fault to avoid fault slip is obtained. Working face supersedure between two mines under thrust fault conditions is carried out, and the coal bump prevention effect is evaluated with microseismic monitoring. The results show that the fault plays a dominant role in the horizontal stress environment of the shallow part, and the surface uplift of the hanging wall of the fault is higher than that of the footwall during the process of fault slip which induces the coal bump behavior in the working face. The closer the working face is to the fault, the more obvious the fault movement is, the higher the frequency and energy of coal bump behavior, and the minimum safe distance between the working face and the fault to avoid fault activation is 455m. Compared with the coal face mining near the fault, it significantly reduces the fault activation frequency, coal bump degree and microseismic energy during mining of far-fault face in the area of Yuejin and Changcun coal mine. The results provide a theoretical basis for the control technology of coal bump under the condition of large faults.

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