地震作用下边坡动力响应数值模拟研究

Research on Numerical Simulation of Slope Dynamic Response under Seismic Action

我国西南山区是地震高发区,严重威胁铁路、公路、水利水电等基础设施建设运营。因此,研究地震条件下边坡的动力响应,对于边坡工程安全运行具有重要意义。地震产生的惯性力作用在边坡上会导致边坡失稳,而地震振幅及持续时间对边坡的影响仍有待研究。文章利用ABAQUS有限元数值模拟软件,分析不同地震振幅及持续时间下的边坡动力响应规律,认为地震加速度为0.2g时,边坡在坡脚处出现塑性应变,整体保持稳定;当震动加速度增大至0.4g时,斜坡形成潜在滑动面,边坡处于不稳定状态。地面最大加速度(PGA)在坡面处随相对高程变化呈先增大后减小的趋势,在竖直方向呈逐渐增大趋势。

The mountainous area of southwest China is a high-incidence area of earthquake,which seriously threatens the construction and operation of railways,highways,and infrastructure of water conservancy and hydropower and so on.Therefore,it is of great significance to study the dynamic response of slope under the seismic condition for the safe operation of slope engineering.The inertial force generated by the earthquake will lead to the slope instability,and the influence of earthquake amplitude and duration on the slope still needs to be studied.The dynamic response of the slope under different seismic amplitudes and duration is analyzed by using ABAQUS finite element numerical simulation software,and it is concluded that when the seismic acceleration is 0.2g,the slope has a plastic strain at the foot of the slope and remains stable as a whole,and when the seismic acceleration increases to 0.4g,the slope forms a potential sliding surface and the slope is in an unstable state.The maximum acceleration(PGA)of the ground increases first and then decreases with the change of relative elevation of the slope surface,and gradually increases in the vertical direction.