陷落柱构造破碎带中巷道围岩变形监测分析

Monitoring and analysis of surrounding rock deformation of roadway in structural fractured zone of subsidence column

为分析470南翼2号回风大巷在陷落柱构造破碎带中锚网索支护效果,采用现场实测方法进行研究。首先对巷道的围岩力学参数进行试验分析,其次设计了测站的监测方案。可以得到,巷道掘支后随着时间的推移,变形速率降低,大约在28d后巷道趋于稳定;巷道掘支后,在稳定状态时测站一的顶底板移近量约在263mm,两帮移近量约在240mm,测站二的顶底板移近量约在341mm,两帮移近量约在342mm。可以看出,过陷落柱阶段巷道围岩的变形量大于完整阶段的巷道围岩变形量,但变形量相差不大。

In order to analyze the supporting effect of anchor-mesh-cable in the collapse column structural fractured zone of No. 2 air return roadway in 470 South wing, the field measurement method was adopted. Firstly, the mechanical parameters of surrounding rock of roadway were tested and analyzed. Secondly, the monitoring scheme of monitoring station was designed. It could be concluded that with time of roadway mining, the roadway gradually stabilized, the deformation rate gradually decreased, and the roadway tended to stabilize after 28 d, when the roadway was in stable state after roadway mining, the roof and floor approaching amount obtained by No.1 station was about 263 mm, the two sides approaching amount was about 240 mm, the roof and floor approaching amount of No.2 station was about 341 mm, and the two sides approaching amount was stable at 342 mm. It can be seen that the deformation of roadway surrounding rock in collapse column stage was larger than that in complete stage, but the deformation was not very different.