基于反应谱分析的边坡动力响应与地震稳定性数值模拟

针对地震作用下的边坡稳定性分析,基于反应谱理论,提出了一种同时考虑了地震动力特性的反应谱法动态分析方法。该方法通过震动峰值加速度和边坡各岩土体单元的节点地震响应加速度谱值,计算出单元的地震影响系数,进而进行强度折减,得到滑动面的安全系数。在此基础上,对某边坡进行了动力稳定性分析,首先采用ANSYS分析地震作用下的边坡模态和反应谱,结合FLAC~(3D)计算弹塑性变形下的边坡稳定性,得出不同工况下边坡稳定性安全系数。实践表明,反应谱法动态分析对地震作用下边坡稳定性具有较好的理论与应用价值。

Numerical simulation of slope dynamic response and seismic stability based on response spectrum analysis

Based on the response spectrum theory, a dynamic analysis method of response spectrum method considering seismic dynamic characteristics is proposed in this paper. In this method, the seismic influence coefficient of each element is calculated through the peak acceleration of vibration and the acceleration spectrum of node seismic response of each rock and soil element of slope, and then the strength reduction is carried out to obtain the safety factor of sliding surface. On this basis, the dynamic stability analysis of a slope is carried out. Firstly, ANSYS is used to analyze the slope mode and response spectrum under earthquake action, and the slope stability under elastic-plastic deformation is calculated by FLAC3D, and the slope stability safety factors under different working conditions are obtained. The practice shows that the dynamic analysis of response spectrum method has higher accuracy and better theoretical and practical value for slope stability under earthquake action.