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Coal Engineering ›› 2023, Vol. 55 ›› Issue (8): 51-57.doi: 10.11799/ce202308010

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Research and application of comprehensive control technology for surrounding rock of strong dynamic pressure roadway in fully mechanized top coal caving face

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  • Received:2022-11-23 Revised:2023-03-26 Online:2023-08-20 Published:2025-04-08
  • Contact: 程 利兴 E-mail:chenglixinghpu@163.com

Abstract:

In view of the difficult problem that the strong dynamic pressure in Laoshidan Coal Mine affects the deformation of the surrounding rock of the roadway, based on the analysis of the distribution of the roof rock and the geostress field, this paper summarizes the deformation and failure characteristics of the surrounding rock of the dynamic pressure roadway, puts forward the collaborative control technology of weakening the external force source and improving the internal support strength, determines the optimal fracturing height, develops the hydraulic fracturing scheme and the high prestressed bolt support scheme, and carries out the underground engineering application. The results show that hydraulic fracturing effectively stimulates roof rock fracture and fracture expansion, forms large-scale fractures, and blocks the transmission path of lateral abutment pressure; The ground pressure of the roadway is obviously weakened, with the roof and floor approaching 402mm, and the two sides approaching 83mm, significantly reducing the deformation compared with the original support; Under the influence of strong mining, the stress of anchor bolt and cable has been effectively improved. The maximum stress of anchor bolt is 79~96.5kN, the maximum stress of anchor cable is 101kN, and the anchor bolt cable is not broken. This shows that after hydraulic fracturing and high prestressed anchor bolt support, the lateral bearing pressure of roadway surrounding rock is significantly reduced, the stability is significantly improved, and the control effect of roadway surrounding rock under strong dynamic pressure is significant.

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