基于内外承载结构的高应力软岩巷道支护方案优化

Optimization of Support Schemes for High Stress Soft Rock Roadway Based on Internal and External Load-bearing Structure

高应力软岩赋存的巷道支护难度大,需对支护参数进行优化确保巷道的稳定。建立了圆形巷道内、外承载结构相互作用的分析模型,提出内外承载结构联合支护研究思路。采用YTJ20型岩层探测记录仪和PHD-2型多功能超声波检测仪,确定顶板和两帮的松动圈深度分别为3 m和2.8 m。采用钢带、金属网配合锚杆支护提高内承载结构的稳定性,采用加长锚杆支护密度提高外承载结构的支护强度,进而使得内外承载结构具有更强的支护能力。巷道变形监测表明:支护参数优化后巷道围岩支护效果良好,可满足回采工作的需要。

High stress soft-rock roadway is difficult to support, the optimized supporting parameters can ensure roadway stability.Analytical model for interaction between inner and outer bearing structures is established. Internal and external load-bearing structure for circular roadway combined support idea is proposed. Surrounding rock structure of roadway is tested by using YTJ20 rock detection recorder and PHD-2 multi-functional ultrasonic detector, and it is determined that loose circle depth of roof and side wall is 3 m and 2.8 m. Steel strip and metal mesh combined with bolt support can improve the stability of internal load-bearing structure, while longer bolt and increasing bolt support density can improve the stability of outer load-bearing structure, so that the inner and outer bearing structure will have stronger support capability. Site roadway deformation monitoring shows that roadway supporting effect is well after optimizing support parameters, it can meet needs of mining work.