深部厚松散层破碎围岩大巷支护参数优化研究

Study on optimized support parameters of mine roadway in broken surrounding rock of deep thick and unconsolidated strata

为了解决陈四楼矿深部厚松散层破碎围岩大巷支护难题,在对该矿-720 m辅助水平回风大巷地质条件和支护形式研究的基础上,采用数值模拟、理论分析和现场观测等方法对巷道支护的锚杆锚固长度、预紧力、锚杆长度、锚杆间排距等参数进行了优化研究,并进行了工业性试验。结果表明:-720 m辅助水平回风大巷合理的支护参数为锚杆的锚固长度至少应为锚杆长度的1/3、预紧力应达到锚杆承载力极限的50%~70%、锚杆长度为2.5 m、间排距为0.7 m×0.7 m,通过实施该优化方案有效地控制该回风大巷围岩变形,达到了预期的目标。

In order to solve a support problem of a mine roadway in broken surrounding rock of a deep thick and unconsolidated strata in Chensilou Mine,on basis of stndying the geological condition and support method of- 720 m auxiliary level air returning roadway,a numerical simulation,theoretical analysis,site observation and other method were applied to a study on the optimization of bolt anchorage length,pretension,bolt length,space and raw distance between the bolts and parameters of the mine roadway support. An industrial trial was conducted in the mine. The results showed that in the- 720 m auxiliary level air returning roadway,the anchorage length of the bolt in the rational support parameters should be 1 /3 of the bolt length at least,the pretension should be 50% ~ 70% of the bolt loading limit,the bolt length should be 2. 5 m,the space and raw distance between the bolts should be 0. 7 m × 0. 7m. With the implementation,the optimized plan could effectively control the deformation of the surrounding rock in the air returning roadway and reached the expected target.