预空技术在大柳煤矿软岩巷道支护中的应用

Application of Pre-emption Technology in Soft Rock Roadway Supporting in Daliu Coal Mine

针对深部矿井复杂高应力状态下,在新掘和修复硐室巷道中,根据巷道设计断面规格,合理扩大断面开挖范围,提前留出围岩扩展变形的空间;这个空间既给高应力留有释放空间,又不能大于各支护单元有效工作阻力控制范围,同时为下道支护单元,即“封层”提供良好的处理基础,从而利于强韧封层的形成。

In view of the complex high stress state of deep mine, in the newly excavated and repaired chamber roadway, according to the design section specification of the roadway, the excavation scope of the section is reasonably enlarged, and the space for the expansion and deformation of surrounding rock is set aside ahead of time;this space not only leaves space for the release of high stress, but also can not be larger than the effective working resistance control range of each supporting unit. At the same time, it provides a good treatment basis for the next supporting unit, i. e."seal", which is conducive to the formation of strong and tough seal.