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Coal Engineering ›› 2026, Vol. 58 ›› Issue (2): 126-135.doi: 10.11799/ce202602016

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Control mechanism and prevention technology for dynamic and static loads in rockburst prevention of backfill mining faces with hard roofs

  

  • Received:2025-06-27 Revised:2025-08-23 Online:2026-02-15 Published:2026-03-16
  • Contact: ZHOU JiaLI E-mail:hangqiu0808@126.com

Abstract:

The strong dynamic load caused by the hard roof breaking and the high stress superposition caused by the large buried depth during the mining process of the working face are the main causes of the rock burst, and the filling mining is an effective means to control the roof breaking. In order to explore the control effect of filling mining on the dynamic and static load source of rock burst, the evolution law of roof breaking height and the distribution characteristics of abutment pressure under different filling rates were studied by theoretical calculation and field monitoring. The classification prevention and control technology of rock burst for filling mining was put forward, which was applied in the deep hard roof working face of Gucheng Coal Mine, and the anti-impact effect was tested by on-site microseismic monitoring. The results show that there is an optimal filling rate in the filling face and after reaching the optimal filling rate, the movement mode of the hard roof changes from periodic breaking to bending sinking, which greatly reduces the dynamic load of the roof breaking, and the reduction of the roof breaking height reduces the peak value of the abutment pressure. The 1123 working face of Gucheng Coal Mine did not reach the optimal filling rate, and the measures of pre-splitting blasting of hard roof, top coal support, high-pressure grouting of thick top coal and large-diameter drilling were taken. The 1 # working face reached the optimal filling rate, the blasting roof breaking pressure relief measures were cancelled, and only the large diameter drilling of coal body and the pressure relief measures in special areas were adopted. After the pressure relief measures were taken in the two working faces, the filling rate of the 1123 working face gradually increased from 70 % to 90 %, and the microseismic events of the roof of the working face changed from “low frequency and high energy ” to “high frequency and low energy ” ; the roof microseismic events of 1 # working face are characterized by “low frequency and low energy ”. The research results can provide theoretical guidance for the mining and anti-impact technology of hard roof working face in rock burst mine.

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