高烈度区水电工程岩石高边坡三维地震动力响应分析

3D DYNAMICAL RESPONSE ANALYSIS OF HIGH ROCK SLOPE RELATED TO HYDROPOWER PROJECT IN HIGH INTENSIVE SEISMIC REGION

基于动力响应时程分析Wilson-θ法的原理和应用条件,结合西部某高坝岩石高边坡工程实例,建立三维高边坡地震动力分析模型。应用动力有限元法,研究岩石高边坡的动态特征,分析高边坡不同部位对地震加速度响应、位移响应及其应力响应特点。最后,探讨地震作用下,由于边坡形状和结构的差异,不同时刻高边坡的不同部位对地震响应的加速度值、位移值和应力值有明显不同,其中边坡中部的加速度有明显放大现象,边坡的中上部对地震响应最为敏感,地震时容易激发而破坏。研究表明,用时程分析法计算边坡地震作用下的动力响应结果能够较真实的反映出岩石高边坡的动态特征以及地震对高边坡的扰动作用。

Based on the principle and application condition of dynamical response time-dependent analysis of Wilson-θ law, a 3D model of high rock slope related to a huge hydropower project is established. The dynamic finite element analysis of high slope is used to investigate the dynamic characteristics of high rock slope and analyze the acceleration response, displacement response, and stress response under the seismic action in different parts of high slope. In the end, the detailed accelerate values of different parts of high rock slope at different periods on the seismic response are discussed, which show that displacement value and stress value are of clear difference for the differences of shape and structure of high slope during the seismic action. The maximum accelerations and active displacements values mainly presented to the middle of high slope, and the middle and upside of high slope are sensitive to the seismic action compared to the other parts of high slope, which lead to failure easily under intensive seismic action. At the same time, the acceleration is enlarged by 2.03 times in the middle of the slope. Dynamic response results of slope in the seismic action are achieved by means of time-dependent analysis, which can be applied to reflect the dynamic characteristics of high rock slope and the disturbance action of high slope during seismic action.