软土地下结构的地震土压力分析研究

在软土室内动力试验和有限元有效应力动力反应分析基础上，采用一种能够全面考虑软土振动孔压上升及消散、震陷、土-结构动力相互作用等因素的软土地下建筑物抗震稳定分析方法，对上海地铁一号线典型地铁车站结构进行地震土压力计算分析。据此对各类常用地震土压力简化计算方法进行评价，为今后改进地震土压力计算方法、提高软土地下建筑抗震设计水平提供了依据。

Research on seismic soil pressure of underground structures in soft soils

Based on the cyclic triaxial and resonant column triaxial test in the lab tests and the seismic response analysis of finite element effective stress, an analytical method of earthquake resistance on the underground structures in soft soils is proposed. Such factors as seismic action between soil and structures, rising and dissipation rule of pore water pressure and the rule of settlement derived from seismic are considered in the model. Such model is used to analyze the seismic soil pressures of the subway station in Shanghai. Some results calculated by simplified calculation methods are contrasted to the result calculated by the model mentioned above. The foundation is provided for amending the calculation method of seismic soil pressure and improving the anti-earthquake designing level of underground buildings in soft soils.