煤柱留巷“卸压-支护”协同控制技术及实践

Cooperative Control Technology and Practice of "Pressure Relief and Support" in Coal Pillar Retaining Roadway

为解决煤柱留巷围岩强烈变形难题,采用理论分析与现场测试相结合的方法,分析了深部煤柱留巷围岩变形破坏机制,提出了煤柱留巷"压裂卸压-强力支护"协同控制原理。在井下进行了现场试验,试验结果表明:煤柱留巷"压裂卸压-强力支护"协同控制技术能有效控制煤柱留巷围岩变形,与未试验段相比,两帮移近量降低73.3%,顶底板移近量降低85.7%。水力压裂技术降低了煤柱上方的应力峰值,转移了应力峰值位置。

In order to solve the strong deformation problem of surrounding rock in coal pillar retaining roadway, the deformation and failure mechanism of surrounding rock in deep coal pillar retaining roadway was analyzed through theoretical analysis and field test, and the cooperative control principle of "pressure relief with fracturin and strong support" was proposed. Field tests were carried out in coal mines, the test results show that the collaborative control technology can effectively control the surrounding rock deformation of the coal pillar retaining roadway. Compared with the original supporting scheme, the two-sided displacement reduces by 73.3%, and the roof and floor displacement reduces by 85.7%. Hydraulic fracturing technology reduces the peak stress above the coal pillar and shifts the position of the peak stress.