地震作用下仰斜式挡墙的动力响应分析

Research on the seismic responses of inclined retaining wall

为了研究地震作用下仰斜式挡墙的地震响应,本文利用数值分析软件Plaxis建立二维数值模型,施加汶川卧龙地震波,分析了不同烈度地震作用下仰斜式挡土墙的地震动响应,得出了以下结论:首先,在不同地震烈度作用下,以仰斜式挡土墙底部为基准,挡墙的中部为加速度和加速度反应谱放大性的转折点,即墙底至0.5倍墙高范围内,水平加速度沿墙高逐渐减小,而在0.5倍墙高至墙顶范围内,水平加速度沿墙高逐渐增加;随着地震烈度的增加,墙后填土的傅里叶谱具有低频放大的效应;地震波的能量沿墙高向上逐渐减小。

In order to research the seismic responses of the inclined retaining wall under earthquake, this article establishes the numerical model by finite element software--Plaxis ,applies earthquake load （Wenchuan-Wolong earthquake wave） , and then analysis the dynamic responses of the inclined retaining wall in different peak ground accelerations. Results are shown as follows：First ,based on the acceleration at the bottom of the gravity wall, the point at the middle of the wall is the turning point, which is that the acceleration and the acceleration response decrease along the wall between the bottom and the middle of the wall, the acceleration and the acceleration response increase along the wall between the middle of the wall and the top of the wall. With the increase of the seismic intensity,the Fourier responses have this characteristic：the low frequency increases,and the total earth pressure increases nonlinearly. The seismic wave energy decreases with the evaluation.