Underground storage is the future oil and gas storage technic. The stability of LPG storage caves and support optimization is the content of this paper. First, on the base of excavation monitoring data of cave; it calculates the parameters of rock. Then, it adopted FLAC3D to simulate the stability of rock, plastic area development and the order of excavation in the main caves. When the Q of rock >10, there's no plastical area showed; when Q between 1~10, the little plastic area is showed on the wall, which is mainly the shearing stress plasticity. When Q<1, more plastic area appears on the wall and floor, which extends into the depth about 1.3 m, which is distributed in arch area. Meanwhile the simulation results show that the order of excavation affects the surrounding rock little. This article foresees the deformation of rock, which would be used to optimize the support parameters.


In 1938, Doctor Hagcon of Sweden mentioned the water curtain underground oil storage. Then the first underground storage appeared in Sweden. Since that time, the underground oil storage appeared in Europe, American, Canada, Japan and Korea and so on. The underground storages have lots of advantages like less place on surface, less costs, more safety, no pullution etc. In Chnia the first undergoround oil storage was built in 1977 at Shandong provinice which has capacity of 150 0000m3. The first LPG underground storage was built in Shantou. Since now, the study on undergound storages of the Chinese experts is just beginning.

Zhiyin Wang discussed orthogonal experimental design of numerical simulation for underground petroleum storage caverns; Yi Wang analysed the 3D fluid-mechanical coupling stability of underground petroleum storage caverns, the strength of surrounding rock mass is reduced by the coupling effect of ground water seepage and stress; Yagang Duan studied the potimization of cross sections and distance of large underground ctorage cavern, it finded that the five-centered arch cross sections was better than straight wall arch cross sections; Mingju Yang analysed the water curtain of underground petroleum caves by the finite element method, that proved the water curtain safe for gas storage. This article mainly discusses the stability of main caves and support technic. The research objects is mainly the LPG underground caverns in Qingdao.

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