基于SIMULINK的高填方加筋路堤地震反应分析

摘要

为研究高填方加筋路堤的地震反应,将其简化为一个多质点体系,考虑加筋对路堤抗侧刚度的影响及筋材与土体间的摩擦力,推导水平地震作用下加筋路堤的动力方程,然后,将动力方程所代表的动力学系统用状态空间法予以描述,根据其状态方程在SIMULINK环境下建立仿真分析模型,从而求解动力方程,获得高填方加筋路堤的地震反应结果.并将此仿真模型运用于分析某一铁路路基加筋土挡墙的地震反应,分析结果与FLAC2D计算值进行对比.研究结果表明:该方法简单实用,求解精度较高,模犁中的力学参数可以通过常规土工试验获得,可应用于实际工程地震反应预测;加筋对水平地震作用下堤顶加速度放大作用有明显的抑制效果;加筋后路堤水平地震位移明显减小.%In order to study seismic response of high-filled reinforced embankment, the embankment was simplified as a multi-mass system, and its dynamic equation under horizontal seismic was deduced considering the effects of reinforcements on soil lateral stiffness and reinforcement-soil friction. The dynamic system represented by the dynamic equation was expressed using the state space method. According to the state equation, a numerical simulation model was established using SIMULINK so that the dynamic response can be obtained. This proposed model was applied to simulate the seismic response of a railway embankment, and the analysis results were compared with those by FLAC2D.The results show that this method is simple and practical, and the parameters in this model can be obtained by general geotechnical experiments, so it can be used in actual seismic engineering. Reinforcements in soil can significantly reduce acceleration amplification effect and horizontal displacement at the top of the embankment due to the horizontal seismic input.