考虑流固耦合的地下储油洞库稳定性研究

Research on Stability of Underground Petroleum Storage Caverns with Consideration of Fluid-Solid Coupling

应力场与渗流场耦合是影响水封式地下储油洞库群稳定性的重要因素之一。洞库群的开挖导致形成区域地下水降落漏斗,因此储库水封系统必须保证稳定的地下水位。以"黄岛地下水封洞库工程"的设计方案为模型,基于流固耦合分析理论,采用有限差分软件Flac3D进行数值模拟,主要分析了饱和水状态下,渗流场对洞库周围围岩应力、位移变形和孔隙水压力的影响,并确定合理的水封方案和最优的水封巷道高度。文中所得结论对实际地下洞库群的设计施工具有一定的参考价值。

Coupling between stress-field and seepage field is one of the important influential factors to the stability of water-sealed underground petroleum storage rock cavern group. The regional groundwater landing funnel is formed because of the excavation of caverns, so the water-sealed system of caverns should ensure stable groundwater level. The research model originates from the design scheme of Huangdao water-sealed underground petroleum storage rock caverns, and based on the fluid-solid coupling theory, a numerical simulation is achieved by Flac3D. Under the saturated water state, the influence of seepage field on the stress of surrounding rocks, displacement deformation , and pore water pressure is analyzed. In addition, the reasonable water-sealed scheme and the optimal height of water- sealed tunnel are obtained. The conclusions have certain referential value for the design and construction of underground rock caverns.