关键词: 地下水封洞库; 洞室布置; 轴向优化; 岩体结构面; 块体稳定性; 块体理论;

Abstract: Underground water-sealed cavern is the main mode of national strategic oil storage.The proper arrangement of main caverns axial direction will be beneficial to both increasing the caverns stability and reducing its support cost.The characteristics of rock mass structural plane are the crucial factor for the caverns axial layout.Through the investigation on joints in surface and deep rock mass in an underground water-sealed oil storage project,4 sets of dominant structural planes were confirmed.Several schemes of main caverns with different axial directions were set,and the stability of possible key rock blocks was analyzed according to Block Theory.Three evaluation indices,volume of unstable key rock blocks,supporting force and number of unstable key rock blocks were proposed to optimize the axial arrangement of caverns.The optimized axial directions range from NE0° to NE40°.The result has great engineering significance and reference value for the optimized arrangement of main caverns in underground water-sealed oil storage.

Key words: underground water-sealed cavern; axial optimization; rock mass structural plane; rock block stability; Block Theory;