可液化地基上地铁车站结构地震反应特征有效应力分析  

Effective stress analysis of seismic response characteristics of metro station structure in liquefiable foundation

作　　者：龙慧[1,2] 陈国兴[1,2] 庄海洋[1,2] 

机构地区：[1]南京工业大学岩土工程研究所,南京210009 [2]江苏省土木工程防震技术研究中心,南京210009

出　　处：《岩土力学》2013年第6期1731-1737,共7页Rock and Soil Mechanics

基　　金：国家自然科学基金项目(No.90715018);江苏省高校自然科学重大基础研究项目(No.08KJA560001)

摘　　要：采用Byrne简化的Martin-Finn振动孔压增量模型描述土体的液化特性,采用Davidenkov黏弹性本构模型描述土体的非线性特性,建立了可液化地基-地铁车站结构非线性静、动力耦合相互作用的二维分析模型,采用动力有效应力分析方法对可液化地基上两层三跨岛式地铁车站结构的地震动反应进行了数值分析,并与动力总应力方法分析的结果进行对比,结果表明:地铁车站结构两侧及底部邻近位置的土体较易液化,地基土的液化对地下结构邻近地表的加速度反应有明显的影响,且在地基土液化的影响下地下结构有明显上浮的趋势,并呈现出中部上凸的变形特征,地下结构的破坏型式为上层顶板和底板两端的受拉破坏、下层底板边跨跨中的上拱弯曲破坏、中柱的受压破坏、侧墙底端的弯曲破坏。Martin-Finn dynamic pore water pressure incremental model simplified by Byrne is used to describe the liquefaction characteristics of the soil. Davidenkov viscoelastic constitutive model is used to describe the nonlinear characteristics of the soil. Then a two-dimensional analysis model about the nonlinear static-dynamic coupling interaction between liquefiable foundation and metro station structure is established. The dynamic effective stress analysis method is used to analyze the dynamic response of two-layer three-stride island-type metro station structure in liquefiable foundation; and then the results are compared to the case of dynamic total stress numerical analysis. The results show that, the soil which is adjacent to the both sides and bottom of metro station are easier to be liquefied; the liquefaction of foundation has a significant influence on the ground acceleration response; the metro station is obviously floated under the influence of liquefaction and has a convex deformation in the middle of the station. The failure modes of the station are as follows： the tensile failure in upper roof and both ends of bottom plane, the arch bending failure in the middle of lower base plate side span, the compressive failure in interior column, the bending failure in bottom of side wall.

关 键 词：地铁车站结构 地震破坏机制 可液化地基 动力有效应力分析 

分 类 号：TU435[建筑科学—岩土工程]