复合顶板酥软煤层巷道支护技术

Roadway Supporting Technology for Soft Coal Seam with Compound Roof

复合顶板岩层构造复杂,各层黏结力低,易发生离层,巷道支护难度大。采用数值模拟的方式分析了复合顶板离层位置对锚杆支护性能的影响。结果表明:当离层位于锚固体边缘时,预应力场相互叠加,但是与深部围岩相脱离,稳定性差,但通过锚索作用,能够弥补锚杆支护的缺陷。实践证明对于复合顶板酥软煤层巷道宜采用高预应力强力支护系统,重视两帮的支护强度,采用短掘短支的方式,能够取得良好效果。

The strata structure of compound roof is complex,and the cohesive force of each layer is low and prone to separation,and the roadway support is difficult.By the method of numerical simulation analysis,we analyzed the effect of separation location of compound roof on the performance of bolt support.It is concluded that when the separation is at the anchor edge,the pre-stress field superimposes on each other,and it is away from the deep surrounding rock,but the role of cable can make up for the defect of rock bolting support.Practice proves that the highly pre-stressed strength bolting system is applied for soft coal with compound roof,and the coal sides＇ support must be strengthened,and the system can obtain good effect with the method of short distance excavating and short distance supporting.