深部大断面硐室围岩变形及控制技术

Deformation mechanism and control technology of surrounding rock of deep chamber with large section

采用数值模拟方法分析了赵固二矿一800 m泵房围岩变形原因及控制技术。认为深部大断面硐室围岩应力集中区距离硐室中心较远,但底鼓较为明显,支护方案设计时应重点关注。基于此提出了主动支护与被动支护联合支护方案,首先锚网喷支护,其次双底拱刚性支架联合支护,第三围岩注浆加固。工程应用表明,锚注+刚性支架支护能有效控制圆岩变形,满足泵房保持长期稳定的要求。

Deformation mechanism and control technology of surrounding rocks of --800 m water pump house in Zhaogu No. 2 Coal Mine were analyzed by using numerical simulation. It was thought that the distance from stress concentration area to the center of chamber was rela- tively far, so the obvious floor heave should be the key point of supporting scheme. Based on the condition, combined supporting scheme of initiative and passive support was proposed which in- cluded bolt-mesh-spurting supporting, rigid support with double bottom arch and grouting rein- forcement. The result showed bolting-grouting and rigid support could effectively control the surrounding rock deformation and meet the requirement of chamber＇s long-term stability.