基于有限元的地震作用下均质路堑边坡动力响应研究

Research on Dynamic Response of Highway Cutting Slope Under Earthquake based on Finite Element

以云南澜沧江二级公路某均质路堑边坡为例,基于有限元法以EI-Centro地震波为输入动荷载,利用ANSYS软件建立数值分析模型,分析了地震作用下,该路堑边坡的动力响应规律。结果表明,边坡动力响应起主导作用的是水平方向的地震力;均质路堑边坡坡脚动力响应最为明显,坡脚点最先开始产生塑性应变,逐渐开始出现土体破坏,应力集中于坡脚;边坡对任意方向输入的地震波均呈现随高度放大趋势,各参数的极大值均出现在坡顶边缘点;均质路堑边坡对输入的地震波存在临空面的放大效应,因此在地震荷载作用下边坡坡面岩土体最易脱落。

Taking a slope of the second-level highway of Lancang River in Yunnan as an example,Using EI-Centro seismic wave as input dynamic load based on finite element method,Using ANSYS software to establish a numerical analysis model,the dynamic response of the cutting slope under the action of earthquake was analysed.The result shows,The dynamic response of the slope is dominated by horizontal seismic waves,The dynamic response of the slope foot of the cutting slope is the most obvious,and the plastic deformation begins at the foot of the slope first,and the soil damage begins at the earliest.The seismic wave input by the slope in any direction shows a trend of magnification with height,and the maximum values of the parameters appear at the edge points of the slope top,The cutting slope has a slope amplification effect on the input seismic waves,so the slope soil is most vulnerable to instability under the action of seismic loads.