【摘要】 考虑土与结构动力相互作用的影响,将地基土—地铁区间隧道结构体系视为平面应变问题,建立了土—地铁区间隧道非线性动力相互作用的有限元分析模型,对圆形和直墙拱形隧道的地震反应进行了数值模拟;分析了在相同的埋深和场地条件的情况下不同隧道结构形式在不同地震动作用下的应力、加速度和相对水平位移反应特性。结果表明:圆形隧道结构的应力和相对水平位移反应明显小于直墙拱形隧道。从抗震设计角度考虑,选择隧道形状时应优先采用圆形隧道。更多还原

【Abstract】 By Using ABAQUS finite-element software and considering the influence of soil-structure interaction,the nonlinear dynamic soil-metro tunnel interaction is modeled.Seismic response of the circular and straight-wall-top-arch tunnel is numerical analyzed,the stresses,acceleration responses and relative horizontal displacements of the tunnel with the same field condition and buried depth are obtained.The computation results prove that stress and relative horizontal displacement response of circular tunnel are less than that of straight-wall-top-arch tunnel,hence circular-shaped tunnel should be considered as a priority.更多还原