松软破碎围岩大断面跨层巷道层位确定及其稳定性研究

Layer Position Determination and Stability Study of Large Cross-section Cross-layer Roadways in Soft and Broken Surrounding Rocks

以国内某大型矿井为工程背景,采用数值计算方法,分析了巷道处于煤层附近不同层位时的围岩应力及破坏区分布规律,并据此确定巷道的稳定性及合理布置层位。研究结果表明:从压酥带范围大小来看,砂质泥岩压酥带范围最小,但是出现跨层,对围岩稳定性不利,综合选择中细砂岩层作为巷道所处层位。从应力云图和位移云图可知,巷道选择在中细砂岩层,能较好地维护围岩的稳定性,可为巷道的长期服务作基础。

On the basis of one large-scale mine,numerical calculation is used to study the surrounding rock stress and failure zones distribution at the different layers,and then the roadways stability and rational layout are determined.The results show that: in sandy mudstone,pressure crisp belt is smallest in terms of its range,but cross layers appear which are harmful to the stability.Given all the conditions,middle-and-fine sandstone is selected as the layer for roadways.From stress nephogram and displacement nephogram,the selection can satisfy the better maintenance of surrounding rock stability and long service for the roadways.