基于Midas/GTS滇西红层高边坡抗震稳定性分析

为了研究滇西红层高边坡的抗震稳定性，以滇西南地区大理—保山，保山—龙陵高速公路工程为依托，运用Midas/GTS软件对滇西红层高边坡的抗震稳定性影响因素进行了数值模拟研究，分析了不同红层倾角与红层软岩距坡顶面距离对抗震稳定性的影响。分析结果表明:滇西红层高边坡倾角处于50°左右，安全系数最小，位移峰值最大，边坡已经失稳破坏或者滑塌；红层软岩与坡顶面距离达到20 m左右时，红层软岩已经从坡顶贯通边坡，坡脚处应力增长明显，位移迅速增加。

Study on Seismic Stability of High Slope along Red Bed in Western Yunnan Based on Midas/GTS

To study seismic stability of high slope along the red bed in western Yunnan, the paper, on the basis of Dali-Baoshan Highway and Baoshan-Longling Highway in southwest Yunnan, made numerical simulation on the factors influencing the stability with Midas/GTS software, then analyzed how the dip angle of red bed and the distance from red bed soft rock to slope top surface affect the stability. The study result shows that the dip angle of high slop along red bed in western Yunnan is about 50 degree with minimum safety factor and maximum peak value of displacement, and the slope is instable or collapsed; the distance from red bed soft rock to slope top surface is up to about 20 m, the red bed soft rock has run through the slope from the top with the stress at the slope toe increased significantly and the displacement increased rapidly.