重力式支挡结构工程的地震动响应研究

Study on seismic response of gravity retaining structure

为了研究地震作用下重力式挡墙的动力响应,本文利用有限元软件Plaxis建立数值模型,施加了Northbridge地震波,分析了不同地震动峰值加速度、不同墙高对重力式挡土墙地震响应的影响,得出了以下结论: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;随着墙高的逐渐增加,挡墙地震主动土压力合力也随之呈非线性增大。随着地震动峰值加速度的增加,挡墙地震主动土压力合力也随之呈线性增大。地震主动土压力强度沿墙高呈非线性分布,且在挡墙底部略有减小。

In order to study the seismic responses of the gravity retaining wall under earthquake, this paper established the numerical model by finite element software Plaxis, applied earthquake load （Northbridge earthquake wave） , and analyzed the influence of different peak ground accelerations and different wall height on dynamic responses of the gravity retaining wall. The results showed that the point at the middle of the wall is the turning point by taking the acceleration at the bottom of the gravity wall as the reference, which means that the horizontal acceleration decreases from the bottom of the wall to the middle of the wall, the horizontal acceleration increases from the middle of the wall to the top of the wall, the seismic active earth pressure increases with the height of the wall nonlinearly,the total seismic active earth pressure increases with the PGA linearly, and the distribution of the seismic active earth pressure is nonlinear along the wall and becomes a little smaller at the bottom of the wall.