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Coal Engineering ›› 2024, Vol. 56 ›› Issue (8): 59-64.doi: 10.11799/ce202408010

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Rock burst prevention technology for hydraulic fracturing on thick and hard roof surface#br#

  

  • Received:2024-07-01 Revised:2024-08-02 Online:2023-08-20 Published:2025-01-17
  • Contact: 马 宏源 E-mail:mhy2021521@163.com

Abstract:

The form of coal mine rockburst disasters is severe, and local pressure relief measures are difficult to effectively eliminate the problem of rockburst disasters. The prevention and control of rockburst are often in a passive state. In response to the difficult problem of preventing and controlling rockburst on the top plate of the working face, the principle of inducing rockburst on thick and hard roof is analyzed. The technology of preventing and controlling rockburst at the source of the roof force source structure in surface hydraulic fracturing transformation is proposed, and experiments are conducted on the 4107 working face of Wenjiapo Mine. The results show that the thick and hard roof provides static load increment without collapse, sudden fracture provides dynamic load disturbance, and the superposition of dynamic and static loads breaks through the critical load to induce impact initiation. Ground hydraulic fracturing causes cracks in the thick and hard roof, artificially liberating layers, reducing the strength and integrity of the thick and hard roof. Long beams become short beams, and large blocks become small pieces. The surface hydraulic fracturing technology causes the roof to crack, changing the overlying load from hard transmission to soft transmission, reducing the stress concentration level of the surrounding rock of the roadway, and ensuring the smooth recovery of the working face.

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