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围岩完整性、变形和稳定性对地下水封石油洞库建造具有至关重要的影响。以我国首个在建的大型不衬砌地下水封石油储备库项目为背景,运用弹塑性理论,在室内岩石三轴试验基础上,研究了花岗岩地层大型不衬砌地下水封石油洞库围岩的完整性以及变形和稳定性。研究表明:岩石的完整性从剪胀出现开始受到破坏,采用剪胀起始点对应摩擦角可对地下工程围岩开挖松动区进行估算;该大型地下水封石油洞库洞室开挖松动区范围从0~15.6 m不等,且与埋深成正比;由于开挖过程中应力路径与剪胀线关系不同,各洞室间中墙完整性变化趋势存在差异;洞壁围岩位移方向与山丘地表走势相关,拱顶沉降和水平收敛值在8~45 mm之间;在洞室底板位置出现了拉应力区,在洞库两侧边墙下端和起拱处出现高剪应力区,在开挖过程中可能出现局部破坏现象。
Surrounding rock integrity, deformation and stability have a crucial impact on the construction of groundwater sealed oil caverns. Based on the first large-scale non-lined groundwater sealed oil reservoir project under construction in our country, based on the elasto-plastic theory, the integrity of surrounding rock of large non-lined underground water sealed petroleum caverns in granite stratum was studied based on triaxial test of indoor rock As well as deformation and stability. The results show that the integrity of rock is destroyed from the appearance of dilatancy, and the loose area of underground excavation can be estimated by using the initial friction angle of dilatancy. Ranging from 0 to 15.6 m, which is proportional to the buried depth. Due to the different relationship between the stress path and the dilatancy line during excavation, there is a difference in the trend of integrity of the middle wall between the caverns. The topography of the mound is related to the trend of the earth’s surface. The vault settlement and the horizontal convergence value are between 8 and 45 mm. The tensile stress zone appears at the bottom of the cavern. Partial destruction may occur during excavation.