Coal Engineering ›› 2022, Vol. 54 ›› Issue (3): 99-104.doi: 10.11799/ce202203019

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Control of rock burst induced by coal pillar and hard-thick roof strata

  

  • Received:2021-03-16 Revised:2021-04-29 Online:2022-03-15 Published:2022-05-13

Abstract: In this paper, to further study the rock burst prevention technology under the specific geological conditions of hard-thick roof strata, the rock burst process of the overlying hard-thick roof strata in the mining process of I010203 working face of a mine was analyzed, the corresponding technical measures were put forward, and the effect of the prevention technology based on the temporal and spatial variation law of ME events before and after the pressure relief and erosion prevention of the working face was tested. The results show as follows: after the mining of B2 coal seam, the overlying hard-thick roof strata was easy to produce hanging roof in the goaf of I010203 working face and the coal pillar area between the I010201 goaf. This part of hanging roof would not only cause the static load stress concentration of coal body, but also cause energy accumulation, resulting in a lot of dynamic load. When the length of hanging roof was too long, strong dynamic load disturbance such as caving and breaking would occur, when the superposition of dynamic load and static load exceeded the critical value, rock burst would occur. The concentrated static load of coal pillar and the dynamic load of hard roof strata breaking were the main controlling factors of rock burst. According to the above analysis results of rock burst, two kinds of pressure relief technical measures (roof breaking pre splitting and advance coal blasting) were designed. The ME events during stable production period before and after pressure relief were selected for comparative analysis of pressure relief effect. It is found that after pressure relief, the daily total energy and frequency of ME events are significantly reduced, and the ME events above 103-104J are significantly reduced, and the spatial distribution of ME events is relatively scattered. The ME events near the roof are significantly reduced, which indicates that the pressure relief measures can effectively reduce the rock burst hazard. The research results can provide a reference for the formulation of pressure relief technical measures of hard-thick roof strata in coal mine.

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