黄岛液化石油气地下储库主洞室岩体稳定性分析

针对液化石油气（LPG）地下储库具有高边墙、大跨度、不砌衬等特点，在开挖过程中不仅要解决好围岩稳定性问题，更要确保地下洞室群能长期安全稳定的运行。通过对库区钻孔资料与已施工的巷道地质调查结果分析，采用赤平投影法分析了黄岛LPG地下储库的主要结构面节理，断层与岩脉的产状。根据块体理论，基于块体稳定分析程序Unwedge预测了LPG主洞室潜在不稳定块体的几何尺寸及稳定性，结果表明，在洞库的拱顶只有少量不稳定块体产生，发生大型不稳定楔形体的关键地区是在J2-J3-J4节理组合的顶部和侧墙，为支护设计提供了依据。

The block stability analysis of main cavern of Huangdao liquefied petroleum gas storage

Because of the LPG underground storage characteristic of high side-wall,large span, and without lining - upet al, in order to solve the problem of stability of surrounding rock, ensure the long - term safety and stable operationof underground excavations, based on the drilling data and analysis on construction of geological of roadway, thispaper analyzed main structural surfaces joints, faults and dykes of the occurrence of Huangdao LPG undergroundstorage using stereographic projection method. According to the block theory, this paper forecasted the LPG maincavity potential unstable geometry size and stability of the block based on the block stability analysis programUnwedge. The results show that in the arch of storage cavern, only few unstable block appears, and the J2-J3-J4jointing combination top and side walls is the key areas of occurring large unstable wedge, which has provided themain theoretical foundation for the supports design.