块体理论在LPG地下储库围岩稳定性分析中的应用

Application of block theory in stability analysis on the surrounding rocks of LPG underground storage

应用UNWEDGE软件结合青岛某LPG地下储库水幕廊道1K0+125～145段进行关键块体的搜索计算,得到4个可移动块体。其中,块体1位于廊道底部,为自稳块体;块体4、5分别位于廊道左右边墙,安全系数为1.945和3.385,基本满足自稳要求;块体8位于廊道顶部,体积和重量均较大,安全系数取为0,需采用特别支护和分析结果提出支护方案。从支护前后结果对比可以看出,块体安全系数提高幅度较大,块体8在锚杆支护和锚喷支护情况下安全系数分别为1.278和6.406,喷射混凝土对于提高块体安全系数作用明显,支护方案满足工程安全性要求。

The research and calculation of the key block of 1K0＋125~145 section in water curtain gallery at Qingdao LPG underground storage have been done using UNWEDGE software,and obtained four removable blocks.Block 1 was a self-stable block and located at the bottom of the gallery.Block 4 and block 5 located at the left and right walls separately,with the security factors of 1.945 and 3.385,can meet the basic requirements of self-stable.Block 8 located on the top of the gallery with large size,heavy weight and a safety factor of 0,required special supporting.Supporting program was put forward on the analysis of the results.By comparison of the results before and after supporting,it can be seen that the security factor increased significantly.The security factors of block 8 under bolting support and anchor support were 1.278 and 6.406,respectively.It is clear that the shotcrete was more effective in improving the security factor of blocks,and the supporting program can meet the safety requirements of the project.