基于连续介质模型的海底隧道支护结构受力特征  

Analysis of Stress Characteristics of Lining Structure for Subsea Tunnel Based on Continuum Medium Model

作　　者：李鹏飞[1] 张顶立[1] 房倩[1] 刘艳[1] 李兵[1] 

机构地区：[1]北京交通大学隧道及地下工程教育部工程研究中心,北京100044

出　　处：《北京交通大学学报》2009年第4期7-12,共6页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：国家"863计划"项目资助(2006AA11Z119);国家自然科学基金资助项目(50778011)

摘　　要：在含水地层中开挖隧道,地下水的存在一方面会影响隧道周边地层的力学参数,另一方面也会在围岩中产生渗流体积力,进而影响地层的应力和位移.对于埋深较浅而水压力较高的海底隧道而言,支护结构除承受围岩压力外,还要承受很高的水压力.支护结构的受力特征受隧道围岩和支护结构间接触面剪应力、隧道顶板厚度、水深、围岩侧压力系数以及支护结构的厚度和刚度等因素的影响,而经典隧道支护结构内力弹塑性解假设的边界条件与实际情况相差很大.文中阐述了弹性力学应力函数法推导支护结构内力的解析解,并采用数值分析方法研究了海底隧道支护结构的受力特征.通过FLAC3D程序验算了厦门翔安海底隧道Ⅴ级围岩海域段支护结构的内力,比较分析了断面形状对支护结构受力的影响.When excavating a tunnel in the saturated soil layer, the existence of groundwater not only affects the physics mechanical parameters of soil around the tunnel, but also causes seepage force in the stratum, which can result in the change of the stress and displacement of soil. To the subsea tunnel with a high water pressure and a shallow depth of burial, the lining structure must endure high water pressure besides the surrounding rock pressure. The mechanical characteristic of the lining structure is affected by many factors such as the shearing strength in the interface between the surrounding rock and the lining structure, the thickness of the rock cover, the depth of water, the ]ateral coefficient of the earth pressure, the stiffness and thickness of the lining structure, et al. The boundary condition assumed in the elastic-plastic solution to the lining structure of the classical tunnel is very different from the real situation. The derivation of the analytic solution on the internal force of the lining structure of the classical tunnel is expatiated. And the mechanical characteristic of the lining structure has been studied by using numerical analysis method. Finally, Through using FLAC3D program, both the lining stress of the Xiamen Xiang＇ an subsea tunnel is checked and the influence of the loads on the lining structure affected by the section form is analysed.

关 键 词：隧道工程 海底隧道 支护结构 水压力 影响因素 

分 类 号：U451.3[建筑科学—桥梁与隧道工程]