School of Energy and Mining Engineering, China University of Mining and Technology-Beijing, Beijing, 100083, China.
Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology-Beijing, Beijing, 100083, China.
Sci Rep. 2023 Mar 23;13(1):4777. doi: 10.1038/s41598-023-32015-7.
The general or single supporting theory and technology of the shallow surrounding rock of the roadway are not suitable for solving the problem of continuous large deformation of the both sides under the continuous migration of coal mass in the deep domain of the roadway side. Furthermore, the general destressing technology of dense drilling in the roadway destroys the shallow anchorage domain while releasing the stress. Therefore, this study proposes the "shallow supporting and deep destressing" synergism technology. This technology provides puissant supporting in the shallow domain of roadway sides, and at the same time, large destressing holes are excavated at the coal mass migration channel in deep stress peak domain far from the anchorage domain, conducting destressing regulation of roadway sides. This technology can shift stress peak domain of the roadway side to solid coal side of destressing hole without destroying the shallow anchorage domain, and at the same time, provide a buffer space for that coal mass in the deep domain of the roadway side continuously migrates to the anchorage surrounding rock, creating a beneficial stress circumstances for the roadway stability. The "shallow supporting and deep destressing" synergism technology can solve the contradiction between the shallow surrounding rock supporting and the continuous migration of coal mass in deep domain. The field application results show that the innovative destressing technology can effectively solve the problem of surrounding rock control in deep roadway.
巷道浅部围岩的一般或单一支护理论和技术不适用于解决深部煤体持续迁移条件下巷道两帮连续大变形的问题。此外，巷道密集钻孔一般卸压技术在释放应力的同时破坏了浅部锚固域。因此，本研究提出了“浅部支护、深部卸压”协同技术。该技术在巷道帮浅部提供强大的支护，同时在远离锚固域的深部应力峰值域的煤体迁移通道中开挖大卸压孔，对巷道帮进行卸压调控。该技术可以将巷道帮的应力峰值域转移到卸压孔的实体煤侧，而不破坏浅部锚固域，同时为巷道深部的煤体持续迁移到锚固围岩提供缓冲空间，为巷道稳定创造有利的应力环境。“浅部支护、深部卸压”协同技术可以解决浅部围岩支护与深部煤体持续迁移之间的矛盾。现场应用结果表明，创新卸压技术可有效解决深部巷道围岩控制问题。
