论文部分内容阅读
地下水封油库是目前世界上最主要的战略石油储备模式,由于它是采用水封的形式将原油储存于地下岩石洞室中,因此,岩体的渗透特性(尤其是各向异性特征)将影响围岩的稳定性。以国内在建的首个大型地下水封石油洞库工程为背景,在花岗片麻岩体渗透各向异性特征研究的基础上,对不同渗透各向异性比值下,洞室围岩地下水压力、流速、位移和应力等进行有限元分析,并采用广义Hoek-Brown准则的强度折减法研究渗透各向异性对洞室群围岩整体稳定性系数的影响。研究结果表明,花岗片麻岩体渗透各向异性对洞库围岩地下水压力和流速具有显著影响,随渗透各向异性比值的增加,地下水压力线性增大,地下水流速呈对数递减关系;渗透各向异性对洞库围岩变形无影响;对围岩应力场影响不明显,可以忽略不计;对洞室群围岩的整体稳定性系数影响较大,总体随各向异性比值的增加逐渐下降。这对地下水封油库工程的稳定性评价具有一定理论和工程价值。
Groundwater reservoir is currently the world’s most important strategic oil reserve mode, because it is in the form of a water seal will be stored in underground rock cavern, therefore, the permeability characteristics of rock mass (especially the anisotropic characteristics) will affect Surrounding rock stability. Based on the study of the anisotropy of granite gneiss body under the background of the first large-scale groundwater sealed oil caverns under construction in China, under different permeability anisotropy ratios, the groundwater pressure, Flow rate, displacement and stress were analyzed by finite element method. The strength reduction method based on Hoek-Brown criterion was used to study the influence of anisotropy anisotropy on the overall stability coefficient of surrounding rock mass. The results show that the permeability anisotropy of granite gneiss body has a significant effect on the pressure and velocity of groundwater in the surrounding rock of caverns. With the increase of permeability anisotropy ratio, the pressure of groundwater increases linearly and the flow rate of groundwater decreases logarithmically. The infiltration anisotropy has no effect on the deformation of the surrounding rock of the caverns; the influence on the stress field of the surrounding rock is insignificant and negligible; the influence on the overall stability coefficient of the surrounding rock of the caverns is large, and the overall anisotropy ratio increases gradually decline. This has certain theoretical and engineering value for the stability evaluation of groundwater oil seal project.