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Coal Engineering ›› 2026, Vol. 58 ›› Issue (3): 130-137.doi: 10.11799/ce202603016

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Study on damage characteristics of weakly cemented overburden rock under the effect of advancing speed #br#

  

  • Received:2024-10-28 Revised:2025-11-26 Online:2026-03-10 Published:2026-04-14

Abstract:

Taking Xinjiang Zhundong No.2 Mine as the engineering background, the typical weakly cemented overburden 1101 fully mechanized caving face is selected as the research object. Through numerical simulation and field measurement, the advancing speed effect of the damage characteristics of the overlying strata under high-intensity mining is studied. The results show that: (1) The numerical simulation results show that the development height of the plastic zone of the overlying rock on the 1101 working face is 181.53m ; the damage degree of overburden rock and the development height of plastic zone decrease with the increase of working face advancing speed. In the process of advancing speed from 3 m / d to 10 m / d, the damage degree of overburden rock decreases from 21.66 % to 12.07 %, which decreases by 9.59 % as a whole. When the advancing speed is 7 m / d, the change rate of overburden rock damage degree is the fastest, and it is considered that the advancing speed of working face is 7 m / d. (2) The relationship between the mine pressure behavior and the advancing speed of the working face is obtained by the field measurement. Within a certain range, the greater the advancing speed, the greater the periodic weighting step distance of the working face. The average advancing speed is 2.5 m / d and 3.5 m / d, and the corresponding average periodic weighting step distance is 18 m and 23.4 m, respectively. The advancing speed to ensure the best state of the support resistance is 5 m / d. (3) Microseismic data indicate that the maximum height of the water-conducting fracture zone in the overlying rock layer is 191 meters, and the development trend is basically consistent with the numerical simulation results. The damage development of the overlying rock has gone through three stages: "low-speed development stage - rapid development stage - stable development stage". (4) Based on the results of numerical simulation, mine pressure behavior and microseismic response, it is considered that the increase of working face advancing speed can effectively reduce the development of overburden damage, strong mine pressure behavior and microseismic energy response characteristics after the 1101 working face of Zhundong No.2 Coal Mine is mined and squared. It is advisable to control the advancing speed of the working face at 3.5 ~ 5 m / d.

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