岩质边坡稳定性数值模拟及动力响应分析

Stability Numerical Simulation and Dynamic Response Analysis for Rock Slope

采用快速拉格朗日方法,以差分技术引入时间因素实现了从连续介质小变形到大变形的分析模拟,对湖南省对口援建项目—四川理县至小金公路工程中豹子嘴边坡建立了三维模型,并采用2008年5.12汶川M8.0级地震中木卡站实测的地震波,在对地震波进行校正的基础上,进行动力数值模拟,分析了地震荷载作用下岩质边坡的位移、加速度和速度的动力响应过程和规律。岩质边坡动力响应分析表明地震荷载下岩质边坡最小水平永久位移、最小水平加速度反应峰值及最小水平速度反应峰值均发生在坡脚处,且在竖向方向均存在较明显的放大效应,其位移、加速度和速度的放大效应存在一定差异,放大倍数分别为18,1.3和6.35。

Based on the fast lagrangian finite-difference method, the numerical simulation analysis on a small deformation of continuous medium to large deformation was achieved by differential technology taken the time factor into account. A three-dimensional model was established on the Baozizui s[ope in the Xiaojin-Li County Sichuan highway which was the counterparts on reconstruction projects of Hunan Province. And the dynamic numerical analysis of the slope was simulated by the seismic waves Observed in Muka station during the Wenchuan 5 ~ 12 M8.0 earthquakes in 2008, based on the correction of seis- mic wave. The displacement, acceleration and speed dynamic response regularity of rock slope were ana- lyzed under the seismic loads. The results showed that the minimum horizontal permanent displacement, the minimum response peak of horizontal acceleration and the minimum response peak of horizontal speed were occurred at the rock slope foot under seismic loading, and in the vertical direction there were obvi- ous displacement amplification effect in which there exist differences in the amplifying effect of displace- ment, acceleration and speed whose magnification ratio was 18, 1.3 and 6.35, respectively.