大松动圈软岩煤巷复合支护技术

Composite support technology of soft coal roadway with large loose zone

针对软岩煤巷受采动影响产生的围岩变形和破坏问题,基于软岩工程力学支护和围岩松动圈理论,探测了巷道围岩松动破坏情况,通过数值模拟和现场观测得出巷道围岩破坏原因,并针对性的提出了以"主被动结合支护"为主体、辅以局部耦合强化的复合支护方案。结果表明:实测结果显示矿井回采巷道属于典型大松动圈;通过采用深锚配合宽钢带支护加强主动支护能力、合理优化煤柱尺寸提高巷道围岩自承能力,并辅以关键部位耦合强化支护的复合支护方式,可实现多种支护方式分区协同承载、整体强化的效果。

In light of the coal roadway deformation and breakage in soft rock under dynamic pressure, the damage-failure of surrounding rock were detected based on coupled supporting principle and broken rock circle theory, and the failure mechanism of surrounding rock was obtained through numerical simulation and practical measurement. A composite support technology was designed, which mainly used passive-active combined support, supplemented by local coupled-strengthen support. The results show that loosen zone of the coal roadway sides is typical large loosen zone. Active support capacity can be substantially strengthened using deep anchor support with wide steel strips and self-bearing capacity of roadway surrounding rock can be improved with optimized coal pillar size, and multi-zone cascade bearing and overall strengthening can be realized with coupled-strengthen support deployed at key positions.