地下水封石油洞库节理裂隙岩体应力-渗流-体变耦合特性与水封机理研究

Groundwater sealing mechanism is one of the fundamental theories for the construction of underground crude oil storage caverns. Stress-seepage-volumetric deformation coupling mechanism of jointed rock mass around underground crude oil storage caverns is investigated using theoretical analysis, scientific experiments and numerical simulations. Hereby, groundwater sealing mechanism is obtained for the storage under typical geological conditions. A series of laboratory and in situ experiments is performed to investigate the influences of volumetric compaction and dilation on the stress-seepage coupling effect. The stress-seepage-volumetric deformation coupling mechanism model is proposed. Large-scale geological model tests are performed to investigate the groundwater sealling mechanism for underground crude oil storage caverns. The failure criterion in sealing and the determination method for the failure are obtained for the storage under typical geological conditions. The sealling criterion is proposed based on the discrete element coupling model. The optimum method for the construction of sealling system is proposed. 3D discrete element coupling method is developed to evaluate the groundwater sealing property and to optimum the settings of curtaining systems for underground storage caverns. The results from this study will extend the theory of both rock mechanics and numerical approach, and will provide scientific basis for the construction of national energy storage caverns.

水封机理是地下水封石油洞库建设中的基础理论之一。本研究结合我国首批大型地下水封石油洞库建设项目，采用科学试验、理论分析和数值计算相结合的方法，研究室内试验尺度下结构面应力-渗流-剪胀/剪缩耦合特性与工程尺度下节理裂隙岩体应力场、渗流场和变形场相互作用机制，揭示节理裂隙岩体应力-渗流-体变耦合机理，建立节理裂隙岩体的应力-渗流-体变耦合模型；开展地下石油洞库水封机理大型地质力学模型试验研究，分析典型地质条件下地下石油洞库水封失效准则与判别方法，获得基于离散介质耦合模型的水封准则，提出适用于典型地质条件的水封方式与水幕系统；发展节理裂隙岩体三维离散介质流固耦合数值分析方法，开展依托地下石油洞库工程的水封性评价与水幕系统优化。研究成果对于促进岩体力学理论和数值分析方法发展具有重要理论价值，并对国家能源战略储备库建设具有重要应用价值。

水封机理是地下水封石油洞库建设中的基础理论之一。本研究结合我国首批大型地下水封石油洞库建设项目，采用科学试验、理论分析和数值计算相结合的方法，研究了节理裂隙岩体应力场、渗流场和变形场相互作用机制，揭示了节理裂隙岩体应力-渗流-体变耦合机理，建立了节理裂隙岩体的应力-渗流-体变耦合模型；开展了地下石油洞库水封机理试验研究，分析了典型地质条件下地下石油洞库水封失效准则与判别方法，获得了基于离散介质耦合模型的水封准则，提出了适用于典型地质条件的水封方式与水幕系统；发展了节理裂隙岩体离散介质流固耦合数值分析方法，完成了依托地下石油洞库工程的水封性评价与水幕系统优化。研究成果对于促进岩体力学理论和数值分析方法发展具有重要理论价值，并对国家能源战略储备库建设具有重要应用价值。