饱和软土自由场振动台试验与数值模拟对比

根据饱和软土自由场地地震反应特性大型振动台模型试验结果，基于u-p格式动力固结方程和饱和两相介质有效应力动力求解方法，采用有限元开放程序平台OpenSEES建立饱和软土自由场地非线性动力有效应力耦合数值模型，对各种试验工况饱和软土自由场地地震反应进行数值建模分析，并将计算结果与振动台试验结果进行对比. 研究表明：数值计算结果与振动台试验结果具备良好的一致性，并呈现出相似的时程变化规律，相互验证了基于OpenSEES计算平台的力学建模和振动台试验结果的正确性. 该数值模型可较合理地模拟饱和软土自由场地地震反应特性，可为进一步建立其他更加复杂的软土场地参数化数值外推模型提供依据.
According to the large-scale shaking table model test results of seismic response features of free field system in saturated soft soil, the freefield nonlinearity dynamical effective stress coupled numerical model of saturated soft soil was established by using OpenSEES based on the u-p formulations of dynamic consolidation equation and effective stress solution method for saturated twophase media. The numerical modeling analysis of the freefield seismic response of saturated soft soil under various test conditions was performed and the calculated results were compared with that of the shaking table test results. Results show that the numerical calculation results are in good agreement with that of the shaking table test and show the similar timecourse changes. Therefore, the validity of mechanical modeling based on OpenSEES computing platform and the shaking table test results were proved each other. The numerical model can reasonably simulate the seismic response characteristics of free field in saturated soft soil, which can provide basis for further establishment of other more complex parameter extrapolation models for soft soil sites.