土与结构相互作用下的地下建筑物动力可靠性分析

Dynamic reliability analysis of underground structure under the interaction of soil and structure

本文在室内软土动力试验和有限元有效应力动力分析方法的基础上,引进可靠度理论提出考虑土-结构相互作用的软土地层中地下建筑物抗震稳定可靠性分析方法,考虑地震烈度和不同软弱土层对地下建筑物抗震稳定的影响,选用多条强震地震记录输入时程对两个典型上海地铁车站进行算例分析。计算内容包括地铁车站和周围土体的动应力,周围土体的孔隙水压力、震陷及车站结构和周围土体的动力可靠度,所得到的计算与分析结果在理论上提高了对软土地层中地下建筑物抗震稳定性分析的水平,为上海软土地层中地铁车站抗震设计提供了依据。

Based on the results of cyclic triaxial test, an analysis of earthquake resistance of several subway stations which are located in sandy soils and clayey soils in Shanghai is presented in this paper. The method of FE dynamic effective stress analysis and reliability analysis was used in the analysis. In order to consider the influence of input earthquake motions, six different recorded earthquake motions selected both from home and aboard were used in the calculations. The results of dynamic response analysis included the dynamic stresses of subway stations and surrounding soils, pore water pressures and settlements of surrounding soils. The dynamic reliability of subway and surrounding soil was also given in the paper. The results of the analysis improve the seismic analysis level of the subway stations surrounded by soft soil, and it is helpful for the design of earthquake resistance of underground structures.