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Ansysis and Evaluation on Stability of Surrounding Rock for Huizhou Water Sealed Underground Oil Storage Caverns in Rock

Author: YangFeng
Tutor: ChenQi
School: Chinese Geology University (Beijing)
Course: Geotechnical Engineering
Keywords: Groundwater seal oil storage caverns Optimal design Caverns effect Fluid-structure interaction Stability of surrounding rock
CLC: TU457
Type: Master's thesis
Year: 2011
Downloads: 132
Quote: 1
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Abstract


The total amount of the face of China's oil consumption continues to improve, the situation of imports increased year after year, for the protection of national energy security, and meet the needs of economic development, start strategic oil reserve base construction is imminent. Way of various oil storage, underground water seal oil storage caverns is a safe, good an oil reservoir in the form of the economy. The Huizhou underground oil storage cavern proposed library design and planning capacity in the world's largest super-large groundwater seal oil storage caverns group. Class engineering in China still lack the engineering practice, analysis and evaluation of such massive caverns during excavation in the surrounding rock stability is an urgent problem. In this paper, Huizhou underground oil storage, application FLAC3D numerical simulation software, designed caverns excavation optimization aspects of the excavation process analysis and evaluation of the stability of surrounding rock in-depth study, specific results of the work are as follows : (1) rock physical and mechanical parameters of the dam site area correction, the use of complex function theory to derive tangential stress formula based on the elasticity approach straight wall arched cavern hole week. (2) the use of finite difference numerical simulation software FLAC3D numerical simulation, put forward reasonable spacing between the main cavern, and in the main cavern construction roadway between the best solution; than elected the caverns overall construction sequence of the hole cohort effects with in-depth knowledge. (3) using the analytical method of complex function of a single hole in the case of different grades of surrounding rock stability analysis, Ⅱ grade III level pluton, vaults and foot at surrounding rock stability problems exist In addition, the use of the FLAC3D software caverns excavation process simulation results show that the three steps stratification large section cavern for the Huizhou oil storage hole library projects promoting the construction method is more appropriate. (4) fluid-structure coupling method simulation caverns excavation, the distribution of the stress field in the excavation process not considering groundwater are basically the same, but the stress is decreased; displacement field is reflected in a dome subsidence multiplied. Flow conditions, the expansion of the hole surrounding rock plastic zone, controlled by the speed and time of the groundwater drainage, drainage adverse plastic zone increased dramatically, adequate drainage, the plastic zone significantly reduce. (5) Huizhou dam site area, abundant rainfall, groundwater recharge is more fully conducive to the formation of water-sealed environment. Under flow conditions, the excavation of the caverns will change the distribution of seepage field hole weeks to form a regional cone of depression, the overall water level is also obvious decline. The simulation results show that, the hole weeks after excavation is completed can not achieve required for safe operation of the pore water pressure, arranged in the roof above the level of water curtain system with vertical water injection hole.

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Rock ( rock ) mechanics and rock testing > Rock stability analysis
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