为研究土岩复合地层地铁结构在地震作用下的受力状态和变形规律，结合大连市某地铁车站工程，采用Midas GTS有限元数值软件，建立三维模型进行动力时程计算，研究结果表明：地下结构跨越土岩分界面地层比在均匀土层中的受力更加复杂，是结构抗震的薄弱部位；结构侧墙各测点的位移随着土岩分界面埋深的增加而增加，在结构底板位置位移达到最大值，当土岩界面超出结构底板范围后各测点位移逐渐减少。结构尺寸及配筋按照静力工况和地震工况，分别配筋并采取包络设计；土岩分界面位于负一层范围时，侧墙内侧配筋及土岩分界面与底板相交时的底板纵向配筋均由抗震工况控制，其他截面均由静力工况控制。经计算，处于土岩复合地层中的地铁结构在多遇地震和罕遇地震的作用下，结构设计能满足抗震性能Ⅰ和Ⅱ的要求。

To study the stress and deformation of subway structures in soil-rock composite strata experiencing an earthquake in Dalian, this study establishes a three-dimensional model by using Midas GTS finite element numerical software to calculate the dynamic time history and analyze the stress and deformation of the structure under the action of an earthquake. The results demonstrate that: the stresses of the underground structure crossing the soil-rock interface are more complicated than in the uniform soil layer, which has weak seismic resistance; the displacement of each measuring point of the side wall of the structure increases with the increase in the buried depth of the soil-rock interface, the displacement of each measuring point reaches the maximum value at the position of the bottom plate of the structure, and the displacement of each measuring point gradually decreases when the soil-rock interface exceeds the range of the structure bottom plate; the structure size and reinforcement are reinforced and enveloped according to static and seismic conditions — when the soil-rock boundary is located on the ground floor, the inner reinforcement of the side wall and the longitudinal reinforcement of the bottom plate are controlled by the seismic condition when the soil-rock interface intersects with the bottom plate, and the other sections are controlled by the static condition; According to the calculation, under the action of frequent and rare earthquakes, the structure design can meet the requirements of seismic performance I and II.

U231.1

国家自然科学基金项目（41877218）