高地应力软岩巷道锚网索拱协同耦合支护技术研究

针对高地应力软岩巷道变形量大、持续时间长、难于支护的问题,以锚网索拱协同耦合支护思路为指导,通过现场钻孔观测、支护参数计算、数值模拟分析,对巷道关键部位锚索二次耦合支护技术进行了研究,提出了合理的支护体系方案。研究结果表明,锚网索拱耦合支护方式可以有效调整深部围岩强度,减小巷道变形量。在试验巷道顶板中线25°左右范围内实施锚索二次耦合,顶板下沉量最大值14.7 mm,两帮移近量最大值57.3 mm,显示了良好的支护效果。

Study on bolt-mesh-cable-shed coupling support technology in soft rock roadway with high ground stress

Aiming at the problems of large deformation, long duration and difficult support in soft rock roadway with high ground stress, this paper was guided by the idea of bolting with Wire Mesh and cable coupling support. The coupling support technology of the key part of the anchor cable was studied through field drilling observation, support parameter calculation and numerical simulation analysis, and the suitable support system scheme was proposed. The results showed that the bolt-mesh-cable-shed support system can effectively adjust the strength of the deep surrounding rock and reduce the deformation of the roadway. In the range of 25 roof middle line of test roadway, the second coupling of anchor cable was conducted with the maximum value of roof subsidence of 14.7 mm and the maximum value of two sides moving closer of 57.3 mm, showing good supporting effect.