考虑采空区压实效应的矩形巷道支护设计研究及应用

Research and Application of Rectangular Roadway Support Design Considering the Compaction Effect of Goaf

为解决73上16工作面运输巷工作期间围岩变形量大难支护等问题,采用理论计算及数值模拟验证73上16工作面运输巷支护设计参数(锚杆长度3.3 m、锚索长度6.2 m)合理性。结果表明:基于巷道松动圈理论,计算出巷道顶板松动圈高度为2.9 m,两帮松动圈范围为2.1 m,锚杆及锚索长度有效穿过松动圈范围;建立了考虑采空区压实效应的数值计算模型,通过数值模拟得出了巷道围岩顶板破坏是逐步发展的过程,未发生完全破坏的细砂岩层不能阻断砂质泥岩的破坏;采用该支护参数后,巷道顶板围岩塑性区破坏面积减少,变形量得到有效控制。经现场实践后,巷道顶板、底板、左帮及右帮最大位移量分别达到69 mm、58 mm、74 mm、78 mm,且巷道在服务期间未出现大变形情况。

In order to solve the problems of large deformation amount of surrounding rock and difficulty in supporting during working period of the 73upper16 working face transportation roadway,theoretical calculation and numerical simulation are used to verify the rationality of the support design parameters(anchor rod length 3.3 m,anchor cable length 6.2 m)for the 73upper16 working face transportation roadway.The results show that based on the theory of loose zone in roadway,the height of the loose zone on the roof of the roadway is calculated to be 2.9 m,the range of loose zones on both sides is 2.1 m,and the length of anchor rods and anchor cables effectively passes through the range of loose zones;A numerical calculation model considering the compaction effect of goaf is established.Through numerical simulation,it is found that the failure of the roof of the roadway surrounding rock is a gradually developing process.The fine sandstone layer that has not undergone complete failure cannot block the failure of sandy mudstone,and after adopting this support parameter,the plastic zone failure area of the roadway roof surrounding rock is reduced,and the deformation amount is effectively controlled.After on-site practice,the maximum displacement amount of the roof,floor,left and right sides of the roadway reaches 69 mm,58 mm,74 mm,and 78 mm respectively,and there is no significant deformation of the roadway occur during service period.