软岩巷道支护参数设计数值模拟分析

Numerical Simulation Analysis of Support Parameter Design for Soft Rock Roadways

通过对和善煤矿软岩巷道围岩应力分布情况进行研究,制定出适合巷道围岩稳定性的巷道围岩支护方案。通过FLAC^(3D)数值模拟详细分析了不同支护方案下巷道围岩的变形情况,发现当锚杆长度为2200mm,锚杆间排距取800 mm×1000 mm,并每两排布置长为6.3 m的2根锚索时,即能保障巷道围岩的稳定性,又不至于造成支护耗材成本高和掘进速度慢等问题,由此将研究得出的的锚杆+锚索支护参数应用于现场,同时引入注浆锚索技术。根据现场实际效果表明,该支护参数可保障软岩围岩长期稳定性。

By studying the stress distribution situation of soft rock roadway surrounding rock in Heshan Coal Mine,a roadway surrounding rock support scheme suitable for the stability of roadway surrounding rock is developed.Through FLAC^(3D) numerical simulation,the deformation situation of roadway surrounding rock under different support schemes is analyzed in detail.It is found that when the length of the anchor rod is 2200 mm and the spacing between the anchor rods is 800 mm×1000 mm,and when 2 anchor cables with a length of 6.3 m are arranged in every two rows,it can ensure the stability of the surrounding rock of the roadway without causing problems such as high support material costs and slow excavation speed.Therefore,the studied anchor rod+anchor cable support parameter is applied to the site,and grouting anchor cable technology is introduced.According to the actual effects on site,this support parameter can ensure the long-term stability of the soft rock surrounding rock.