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以国内首个大型地下水封石油洞库工程为背景,在考虑洞库围岩节理裂隙的随机分布特征基础上,采用离散介质流-固耦合理论对大型地下石油洞库水封性进行了评价。介绍了地下水封储油洞室水封原理与水封准则。通过室内结构面剪切试验获得了结构面参数,采用Barton-Bandis剪胀模型对结构面参数进行了校验。根据库区节理裂隙统计结果,建立了洞库围岩的随机节理裂隙网络模型。分析了不同水幕压力条件下洞室开挖后地下水压力分布情况、涌水量大小和洞库围岩变形与受力情况。分析表明:在水幕压力大于或等于75 kPa的条件下,洞室周围地下水压力满足水封准则;在水幕压力为75 kPa条件下各洞室涌水量在0.003~0.015 m3/d之间,拱顶沉降量在16~32 mm之间。研究结果可为地下水封石油洞库水幕系统设计提供依据。
Based on the first large-scale groundwater sealed oil caverns project in China, based on the random distribution characteristics of the surrounding rock joints and fractures in the caverns, the water-sealing characteristics of large-scale underground oil caverns are evaluated by the discrete medium fluid-solid coupling theory. Introduced the groundwater seal oil storage chamber seal principle and water seal guidelines. The structural plane parameters were obtained from the shear tests on the structural plane of the building, and the parameters of the structural plane were calibrated using Barton-Bandis dilatancy model. According to the statistical results of the joint fissures in the reservoir area, a stochastic joint and fissure network model for the surrounding rock of the reservoir is established. The distribution of groundwater pressure, the amount of water inflow and the deformation and stress of surrounding rock of caverns under different water curtain pressures are analyzed. The analysis shows that the groundwater pressure around the cavern satisfies the water seal criterion under the condition that the water curtain pressure is greater than or equal to 75 kPa. The gushing water volume of each cave under the water curtain pressure of 75 kPa ranges from 0.003 to 0.015 m3 / d, Dome settlement between 16 ~ 32 mm. The results provide the basis for the design of water curtain system in underground water sealed petroleum caves.