|Study on creep characteristics and stability control of surrounding rock in deep chamber group
|中文关键词: 深部硐室群 蠕变失稳 锚杆间排距 稳定性控制
|英文关键词: chambers in deep creep instability bolt spacing stability control
| 为了探究深部硐室群围岩蠕变特性和不同锚杆间排距对围岩变形的抑制作用,本文以陈四楼煤矿深部硐室群为研究对象,采用室内实验对深部硐室群砂质泥岩试样的蠕变特性进行分析,通过数值模拟方法对锚杆间排距和硐室群的支护效果进行研究。研究结果表明:随着荷载水平的增加,岩石轴向变形不断增加,当荷载增加到0.9σc时,岩样发生蠕变失稳破坏；深部巷道随着锚杆间排距的增加,围岩应力及变形均呈现先减小再增加的特征,当间排距为0.5 m时,可以较好地实现围岩与锚杆的耦合支护效果；将 0.5 m 的锚杆间排距应用到深部硐室群时,硐室群顶板及两帮应力分布更加均匀,围岩整体变形量较小,现场监测表明,硐室围岩底鼓量最大,顶板下沉量次之,两帮收缩量最小。
| In order to explore the creep characteristics of surrounding rock in deep chamber group and the inhibitory effect of different row spacing between bolts on surrounding rock deformation, taking deep chamber group of Chensilou Coal Mine as the research background, the creep characteristics of sandy mudstone samples in deep chamber group were analyzed by laboratory experiments, and the supporting effect of bolt row spacing and chamber group was studied by numerical simulation method. The results show that with the increase of load level, the axial deformation of rock increases continuously. When the load increases to 0.9σc,the creep instability failure of rock sample occurs. With the increase of row spacing between bolts in deep roadway, the stress and deformation of surrounding rock first decrease and then increase. When the row spacing is 0.5 m, the coupling support effect of surrounding rock and bolt can be better realized. When the row spacing of 0.5 m bolts is applied to the deep chamber group, the stress distribution of the roof and two sides of the chamber group is more uniform, and the overall deformation of the surrounding rock is small. The field monitoring shows that the floor heave of the surrounding rock of the chamber is the largest, followed by the roof subsidence, and the shrinkage of the two sides is the smallest.