地下水封石洞油库围岩稳定性三维数值分析

摘要

In order to evaluate the stability of surrounding rocks in an underground water-sealed oil storage cave and based on the landform and the layout of rock layers and caverns in the construction site,the three dimensional calculation model is created by the finite difference method program FLAC3D;the rational initial conditions (gravitational field,geologic structure stress and groundwater osmotic pressure) for analysis are set;the stress and displacement change of surrounding rocks in the underground oil storage cave during the construction and excavation process of are simulated and calculated.The calculation results show that the surrounding rock of the cave group is stable when the cross section of the single cave is 20 m wide,30 m high.%为了评价某地下水封石洞油库的围岩稳定性,根据工程建设场地的地形以及岩层、洞室分布,运用有限差分法程序F LA C3D建立了三维计算模型;设置了合理的分析初始条件(重力场、地质构造应力和地下水渗压);对地下储油洞室施工开挖过程中洞室围岩的应力及位移变化进行了模拟计算.计算结果显示,单洞截面为20 n宽、30 m高时,洞室群的围岩是稳定的.