基于COMSOL的地下水封油库围岩流固耦合特征模拟研究  

NUMERICAL SSIMULATION FOR FLUID-SOLID COUPLING CHARATERISTICS IN SURROUNDING ROCK OF UNDERGROUND WATER-SEALED OIL STORAGE BASED

作　　者：张彬[1] 李卫明[1] 封帆[1] 吴兵[1] 曹小亮[1] 

机构地区：[1]中国地质大学(北京)工程技术学院,北京100083

出　　处：《工程地质学报》2012年第5期789-795,共7页Journal of Engineering Geology

基　　金：国家自然科学基金项目(40902086);水利部岩土力学工程重点实验室开放基金项目(G07-08);中央高校基本科研业务经费项目(2010ZY14)资助

摘　　要：地下水封油库通常建造于完整性好的结晶岩体内部,利用"隙存水封"的原理将油气封闭于地下洞室内部,洞库围岩在施工及运营期间具有典型的流固耦合特征。论文基于裂隙岩体流固耦合理论,采用COMSOL Multiphysics软件对洞库围岩不同工况下流固耦合特征进行了模拟研究。研究结果表明:地下洞库在不设置人工水幕情况下,开挖后洞室顶部地下水位明显下降,并形成降落漏斗,可能导致洞室油气外溢;设置人工水幕后,洞室顶部地下水位下降趋势得到明显控制,有效确保了水封的可靠性;在设置水幕的情况下,洞室直墙及洞室拱顶与底板角点处出现明显的应力集中,但围岩仍未出现连贯塑性区,洞室最大位移不超过5mm,洞室围岩稳定性良好。分析成果对于指导洞库优化设计及施工具有一定的参考价值。Underground watersealed oil storage is usually built in integral crystalline rock masses. Based on the theory of water sealing, oil is stored in underground cavern. In the surrounding rock, typical fluidsolid coupling characteristics exist in the process of construction and running. Based on flowsolid coupling theory of fractured rock mass, COMSOL Multiphysics software is used to simulate the fluidstructure interaction of surrounding rock under different working conditions. Research results show the follows. Without setting water curtains the underground wa ter level at top of the cavern decreases obviously and forms the funnel, which could lead the spill of oil and gas. Af ter the water curtains are set, the fall trend of water level is effectively controlled and the sealing of cavern is en sured. With setting water curtains, obvious stress concentration appears in straight wall, vault and the corner points of floor. But the plastic zone still does not appear in surrounding rock. The maximum displacement of cavern does not exceed 1 mm. Besides, the stability of surrounding rock is good. The results can serve as references to the de sign and construction of underground engineering.

关 键 词：地下水封油库 流固耦合 COMSOL Mutiphysics软件 渗流场 应力场 

分 类 号：TU46[建筑科学—结构工程]