摘要
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。
Underground oil storage caverns are the main mode to strategic crude oil storage in the world,which is the underground rock caverns below ground water level and prevented leakage by water sealed. And the permeability of surrounding rock mass would affect the stability of caverns,especially the anisotropic. Taking an oil storage caverns as a case, which is the first large oil storage project in China. Based on calculation of permeability tensor of Granitic Gneiss,the groundwater pressure distribution,flow velocity,displacement and stress in the surrounded rock was gained with different anisotropic permeabilities by finite element method（FEM）.And the factor of safety of rock caverns was obtained by strength reduction on the Generalized Hoek-Brown criterion. It shows that anisotropic permeability of Granitic Gneisses has a significant effect on the groundwaterpressure and flow velocity in surrounding rock,which the pressure increase linearly and flow velocity decrease logarithmic with increase of permeability anisotropy ratio. It has no effect on displacement and negligible on stress of surrounding rock. But it has a greater impact on factor of safety of rock caverns,which is general decreased with anisotropy ratio increased. It has some theoretical and engineering values to stability evaluation of underground water sealed oil storage caverns.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2014年第A02期3803-3809,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
中国地质大学岩土钻掘与防护教育部工程研究中心开放课题基金(201305)
三峡大学2012年度人才科研启动基金项目(KJ2012B042)
北京市科学技术委员会重点资助项目(20090102–2796)
