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Coal Engineering ›› 2023, Vol. 55 ›› Issue (8): 88-95.doi: 10.11799/ce202308017

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Present situation and prospect of damage mechanism and surrounding rock control of anchored fractured rock

  

  • Received:2023-02-01 Revised:2023-03-18 Online:2023-08-20 Published:2025-04-08

Abstract:

Based on the background of gas extraction in outburst coal seam, the paper introduces the multiple disturbance process of surrounding rock of mining roadway, especially floor roadway, and combs the damage mechanism and stability control method of surrounding rock of mining roadway. This paper introduces the expansion law of the fractures in the extraction boreholes and the distribution characteristics of the pressure relief fractures in the coal seams. This paper summarizes the research progress on the crack propagation law, the instability mechanism of the sliding surface and the action mechanism of the anchor bolt in the anchored layered fractured rock; The damage evolution mechanism of coal samples and anchored coal samples under cyclic loading is discussed. In recent years, the roadway control methods under complex conditions (mining influence, high stress, broken surrounding rock) are reviewed, including grouting reinforcement, bolt-grouting reinforcement and surrounding rock joint control technology. Finally, the shortcomings of the above research are analyzed and the future development trend is prospected; Under the condition of multiple disturbances, the research should be strengthened in the aspects of the development and evolution characteristics of the surrounding rock fractures of the mining roadway, the evolution of the geological strength factors of the surrounding rock, the evolution characteristics of the low-cycle fatigue damage of the fractured rock strata and the anchored fractured rock strata, the constitutive relationship, and the stability control methods and technologies of the surrounding rock of the mining roadway.

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