地下水封储油库洞型结构的数值模拟对比

Numerical simulation comparison on the cavern forms of underground water-sealing oil storage

对于大断面的地下水封石油洞库,洞型对于洞室的稳定性、耐久性以及对所储油品的密封性都很重要。以某地下水封石油洞库工程为例,从围岩应力和位移的角度对3种洞型(直墙拱形、马蹄拱形、椭圆拱形)进行NCAP-VEP数值模拟,分析各洞型围岩的受压和受拉情况。椭圆拱形的稳定性最差。从施工、运营等方面考虑,马蹄拱形施工难度大于直墙拱形,而且由于马蹄形下部向洞内倾斜,运营期间容易产生落石起火的危险,因此认为直墙圆拱形或直墙三心拱形最佳。

For underground water-sealing oil storages with large section, the cavern form plays an important role for the stability, durability and oil sealing capacity of caverns. In this paper, a certain project of underground water-sealing oil storage was taken as an example. NCAP-VEP numerical analysis was conducted on the cavern forms from the perspective of stress and displacement of surrounding rock. Numerical simulation was carried out mainly on three kinds of cavern forms （straight-wall arch, horseshoe arch and elliptic arch）. And the pressure and tension applied on the surrounding rocks of each type of cavern were analyzed. It is considered from the view points of construction and operation that the construction of horseshoe arch cavern is more difficult than that of straight-wall arch cavern and it tilts towards inside the cavern at the lower part, so fire caused by falling rock occurs easily during its operation. Therefore, the straight-wall round or straightwall three-center arch is selected as the optimal cavern form. （2 Figures, 2 Tables, 19 References）