深井巷道围岩松动圈现场测试及支护方案优化

Field Test Experimental of Tunnel Surrounding Rock Loosing Circle of Deep Well and Supporting Scheme Improvement

巷道开挖后围岩应力重新分布,当应力大于煤岩体的极限应力时,巷道周边一定范围的煤岩体就会发生变形破坏,围岩将破碎产生裂隙进而形成松动圈。松动圈的大小与围岩强度、原岩应力大小、巷道断面、巷道掘进与支护等多种因素有关。在分析探地雷达松动圈探测机理的基础上,对轨道顺槽巷道不同断面位置进行了围岩松动圈探测,巷道围岩松动圈范围在1.1～1.6 m,并根据测试结果对巷道的支护方案进行了优化。

Coal and rock of tunnel periphery deformation and failure occurs, surrounding rock will be broken and cracked, and then loose circle formed after excavation of tunnel surrounding rock stress distribution again, when stress is more than the limit of coal and rock stress. Loose circle will be influenced by strength of surrounding rock, original rock stress size, tunnel section, excavation and supporting of tunnel. Based on the electromagnetic wave propagation in GPR loose circle detection mechanism analysis rock loose circle was detected in different position of track tunnel, surrounding rock loose circle is in the range of 1.1 m to 1.6 m. According to the test results, the supporting scheme of pillar improves.