土、结构特性对饱和土-地下综合管廊动力相互作用影响分析
Influence of the Characteristics of Soil and Structure on the Dynamic Interaction of Saturated Soil-Underground Utility Tunnel

将土体视为固-液两相介质，基于饱和土体有效应力原理，建立饱和土体-地下综合管廊结构体系相互作用动力模型：在地应力平衡的静力状态下，采用Duncan-Chang非线性弹性本构模型，在地震波作用的动力状态下，采用Davidenkov非线性黏弹性本构模型；考虑饱和土体黏弹性动力人工边界条件，并将地震动作用转化为作用在人工边界节点上的动力荷载。模型考察不同土体材料、结构特性以及土-结构接触摩擦对结构地震响应的影响，得出如下结论：（1）地震波的卓越周期与场地卓越周期相近时，引起结构上的变形最大；（2）综合管廊结构管廊壁厚越薄，埋深越深，结构尺寸越大，结构刚度越小，结构变形越大；（3）不考虑土-结构接触面的状态非线性将会增大结构变形。
Based on the effective stress principle of saturated soil, the dynamic interaction model of saturated soil-underground utility tunnel (UUT) system was established by considering the soil as a solid-liquid two-phase medium. During modeling, the Duncan-Chang nonlinear constitutive model was adopted under static condition of geostress balance, and the Davidenkov nonlinear viscoelastic model was adopted under dynamic condition of seismic wave action. Then the dynamic artificial boundary conditions considering the viscoelasticity of saturated soil were used, and the ground motions were transferred to the dynamic loads applied on the nodes of the artificial boundary. The seismic responses of UUT were investigated under different soil materials, different rigidity of the structure, and the soil-structure interaction. The results show the following:(1) The deformation of the structure reaches the maximum when the predominant periods of the site and the earthquake wave are similar; (2) the thinner the UUT wall, the larger the depth, and the greater the structure size; moreover, the larger the structure stiffness, the greater the structure deformation; (3) the deformation of the structure will be enlarged if the state nonlinearity of the interface between soil and structure is neglected