裂隙岩体渗透各向异性对地下储油洞库水封性的影响规律

为研究岩体渗透各向异性对地下储油洞库的水封性影响规律,建立油库单一洞室的二维等效连续介质模型,用不同渗透张量表征岩体渗透各向异性的不同情况,并开展数值模拟。从洞室周围水压力、渗流场和涌水量等角度对模拟结果进行分析,并评价了洞室水封性。结果表明:岩体各向渗透性较均匀时,储油洞室水封性要求相对一致,有利于水幕系统的统一设计和施工处理,容易通过设置的水幕系统保证洞室整体的水封密闭;岩体最强渗透方向在45°～90°之间时,有利于水幕系统的水压力向下传递,形成高水力梯度区包围洞室,保证洞室密封。

Influence of Permeability Anisotropy in Fractured Rock Masses on Water Seal Property of Underground Oil Storage Cavern

In order to study the influence of rock mass permeability anisotropy on the water seal property of underground oil storage cavern, a two-dimensional equivalent continuous medium model of a single cavern is established. Different permeability tensors are used to represent different permeability anisotropy of rock mass, and numerical simulation is carried out. The simulation results are analyzed from the perspectives of water pressure, seepage field and water inflow around the cavern, and the water seal property of the cavern is evaluated. The results show that: when the rock mass has relatively uniform permeability, the water sealing requirements of the oil storage cavern are relatively consistent, which is conducive to the unified design and construction treatment of water curtain system, and it is easy to ensure the overall water seal of the cavern through the installed water curtain system. When the strongest penetration direction of the rock mass is between 45° and 90°, it is beneficial for the water pressure of the water curtain system to transfer downward, forming a high hydraulic gradient area surrounding the cavern and ensuring the water seal of the cavern.