基于稳定性模拟分析的地下水封洞库储油洞室断面优选方法研究
Research on the Optimization Method of Oil Storage Cavern Section of Underground Water Sealed Cavern Based on Stability Simulation Analysis

洞室断面尺寸对地下水封石油洞库的变形和稳定性具有至关重要的影响。以我国某个在建的大型非衬砌地下水封石油洞库项目为例，运用Hoek-Brown强度理论，采用有限元软件模拟不同断面尺寸储油洞室围岩的应力分布状态及稳定性。研究表明：储油洞室开挖后，应力场会重新分布，洞室边墙底部应力较大，产生应力集中现象，而洞室边墙处应力较小。围岩应力作用下洞室开挖应力型破坏主要受最小主应力影响。在地应力作用下洞室变形主要集中在直边墙中部区域，对于断面22 × 30 m (长 × 宽)工况，最大水平位移为18.8 mm，相应的收敛应变率为0.16%，岩体不具有变形破坏风险，并确定为最优断面。
The section size of the cavern has a vital influence on the deformation and stability of the underground water-sealed oil cavern. Taking a large unlined underground sealed oil cavern project under construction in China as an example, using Hoek-Brown strength theory, the stress distribution and stability of surrounding rock of oil caverns with different section sizes are simulated by finite element software. The research shows that after the excavation of the oil storage cavern, the stress field will be redistributed, the stress at the bottom of the cavern side wall is larger, resulting in stress concentration, while the stress at the cavern side wall is smaller. Under the action of surrounding rock stress, the stress type failure of cavern excavation is mainly affected by the minimum principal stress. Under the effect of ground stress, the deformation of the cavern is mainly concentrated in the middle area of the straight side wall. For section 22 × 30 m (length × width) condition, the maximum horizontal displacement is 18.8 mm, and the corresponding convergence strain rate is 0.16%. The rock mass has no risk of deformation and failure, and is determined as the optimal section.