大型地下水封石油洞库施工过程力学特性研究  

Mechanical properties of surrounding rocks of large water-sealed underground oil storage caverns during construction process

作　　者：王者超[1] 李术才[1] 薛翊国[1] 邱道宏[1] 田昊[1] 

机构地区：[1]山东大学岩土与结构工程研究中心,济南250061

出　　处：《岩土力学》2013年第1期275-282,共8页Rock and Soil Mechanics

基　　金：国家自然科学青年基金项目(No.41202205);中国博士后特别资助基金项目(No.2012T50615);中国博士后科学基金面上资助项目(No.20100481279;No.20110491597)

摘　　要：施工过程对地下工程岩土力学性质具有重要影响。以国内首个在建的大型地下水封石油储库为背景,运用流-固耦合理论,研究了不同排水条件下大型地下水封石油洞库的施工过程力学特征。研究表明排水条件和开挖顺序对洞库渗流场和稳定性具有重要影响。排水条件下洞库围岩孔隙水压力小于不排水条件下,而同在排水条件下不同开挖顺序洞库孔隙水压力时空分布和涌水量也不相同。排水条件下洞壁围岩松动区范围远小于不排水条件下范围,但两种条件下应力场时空分布规律均与开挖顺序密切相关。排水条件下洞库围岩水平收敛小于拱顶沉降,而不排水条件下洞库围岩水平收敛大于拱顶沉降。在相同排水条件下围岩变形与开挖顺序有关。研究成果不但可以为大型地下水封石油洞库建设提供依据,还可丰富施工过程力学理论内涵。Construction process is of significance for geotechnical performance of underground facilities.The mechanical properties of underground crude oil storage caverns under different drainage conditions and subjected to different excavation processes is studied by using fluid-solid coupling theory.It is shown that drainage condition and excavation sequence are important for pore pressure distribution and stability of the caverns.Pore pressure around the caverns in the drained cases is lower than that in the undrained cases.In the drained cases,the pore pressure distribution and groundwater inflow flux are dependent on the excavation sequence.The extents of excavation induced loose zones in undrained condition are much higher than those in drained condition.The distributions of radial and tangential stresses are dependent on the excavation sequence.The horizontal convergences in drained cases are lower than those in undrained cases;while the crown settlements in drained cases are higher than those in undrained cases.In the same drainage condition,the deformation of caverns is dependent on the excavation sequence.The results could not only provide a reference for the construction of the underground crude oil storage caverns,but also enrich the scope of the principles for construction process mechanics.

关 键 词：地下石油洞库 流固耦合 排水条件 开挖顺序 渗流场 稳定性 

分 类 号：TU443[建筑科学—岩土工程]