Coal Engineering ›› 2025, Vol. 57 ›› Issue (7): 95-101.doi: 10. 11799/ ce202507014

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Application of bedding gas extraction drillings in pressure relief for rockburst prevention

  

  • Received:2024-06-20 Revised:2024-09-01 Online:2025-07-11 Published:2025-08-14

Abstract:

As high gas mines gradually enter the realm of deep mining, the problem of rockburst has become increasingly prominent. In response to the problem of rockburst in high gas mines, the technology of anti- punching pressure relief by gas extraction borehole along stratum in gas mine is discussed. The research results indicate the followings. Extraction drilling can reduce the stress environment of coal. However, the pressure relief effect of gas drainage drilling is slightly weaker than that of large-diameter pressure relief drilling. By utilizing the lateral stress zoning characteristics of the surrounding rock of the roadway, improved sealing process of extraction and pressure relief drilling, the sealing section of the borehole is transformed from a single section sealing to a double section sealing. The extraction and pressure relief technology was established, and further applied to the high gas mine walking face. Field test results show the followings. After the construction of extraction and pressure relief drilling, the average maximum energy of microseismic events decreased by 4000J, the average daily energy decreased by 1000J, which indicated that the roof activity was significantly weakened. The displacement of the two sides was reduced by 300mm, the proximity of the top and bottom was reduced by 100mm, which indicated that the deformation of the roadway surrounding rock is obviously improved. This indicates that sequential drilling can achieve the pressure relief effect of the coal seam in the mining space, while also taking into account the functions of gas extraction and pressure relief from rock burst, truly achieving the dual use of one hole.

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