地下水封石油洞库岩体双重裂隙网络渗流特性及其与水幕系统协同工作机理研究

One of the critically important scientific questions for the construction of underground oil storage caverns with ground water curtaining is the seepage property of jointed rock mass. The seepage property of rock mass is controlled by the joints, which are widely distributed in rock mass and appear in different sizes. Due to the characteristics of underground oil storage caverns with ground water curtaining, the fractures in the rock mass of them exhibits the characteristics of double size. The joints of class III dominates the fluid flow in rock mass. The joints of class IV connects the major permeable joints and excavation space. In this study, the integrated technology for identifying the rock joints in different sizes will be developed according to the geological characteristics of rock mass and the double-sized discrete fracture network of joints will be presented. A series of laboratory seepage tests and field hydrodynamic tests will be performed to determine the seepage behavior of joints in different sizes and the coupling of seepage behavior of joints in different sizes. A double-sized discrete fracture network seepage model will be proposed based on the fracture network of joints, physical equations and continuity equation of medium. The numerical analysis method of the model will be developed. According to the characteristics of ground water curtaining system, the collaborative mechanism of the system and double-sized fracture network will be investigated. The theory and method for designing water curtaining system will be developed based on the collaborative mechanism. 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.

裂隙岩体渗流特性是岩体力学重要研究内容之一，也是地下水封石油洞库建设中关键科学问题。地下水封石油洞库岩体结构面具有典型双重尺寸特征：III 级结构面是地下水渗流的优势路径，而IV 级结构面是将主干裂隙网络与开挖空间连通的主要路径。本研究拟结合我国首批大型地下水封石油洞库，发展工程岩体结构特征现场精细识别综合技术，建立岩体双重裂隙网络模型；开展一系列室内和现场裂隙网络渗流试验，研究不同尺寸裂隙与交叉裂隙渗流特性以及两种尺寸耦合裂隙网络渗流特征，获得岩体双重裂隙网络渗流特性；根据裂隙网络拓扑关系、渗流物理方程和物质连续方程，建立岩体双重裂隙网络渗流模型，发展模型的数值分析方法；根据地下水封石油洞库岩体渗流特性，采用动态优化理论，揭示岩体渗流特性与水幕系统协同工作机理，提出水幕系统设计理论和方法。研究成果对于促进岩体力学理论和分析方法发展具有重要科学价值，并对国家能源战略储备库建设具有应用价值。

裂隙岩体渗流特性是岩体力学重要研究内容之一，也是地下水封石油洞库建设中关键科学问题。地下水封石油洞库岩体结构面是地下水渗流的优势路径，裂隙网络渗流特征与水幕系统协同工作机理是决定洞库性能的理论基础。研究依托我国黄岛和湛江两座首批大型地下水封石油洞库，开展了一系列室内和现场裂隙渗流试验，研究获得了裂隙网络渗流特征；根据裂隙网络拓扑关系、渗流物理方程和物质连续方程，建立了岩体裂隙网络渗流模型，发展了模型的数值分析方法；根据地下水封石油洞库岩体渗流特性，揭示了岩体渗流特性与水幕系统协同工作机理，提出了地下水封洞库水封效率评价方法。