西南某机场高填方边坡稳定性分析

Analysis on the High Embankment Slope Stability in a Southwest Airport

西南山区机场高填方边坡具有填筑体高度大且大多顺坡填筑,软弱地基复杂,填筑加载速率快而沉降间歇期短,地下水系重塑,填方体功能分区复杂等特点,使得机场高填方边坡的变形与稳定性问题十分突出,值得结合具体的工程案例,进行深入探讨。以西部某典型的填筑高边坡为例,通过数值计算,同时结合现场监测资料进行对比分析,评价其在不利的工程地质和地形地貌综合影响下,其边坡稳定性状况。研究结果表明:高填方坡脚最大水平位移0.10 m,坡脚最大沉降量为2.0 m,坡顶最大水平位移为0.22 m,坡顶最大水平沉降量为3.5 m,潜在滑动面没有形成滑动面,与实际边坡监测结果相比,数值计算的预测结果比实际监测值大。边坡的变形量符合工程设计要求。

High embankment slope has a lot of features in southwest mountain airport, such as the large filling body mostly embanked along the slope, the complex soft ground, the fast filling loading rate but in short settling intermission, remodeling the groundwater system, and the complex functional zoning of filling body, which make the deformation and stability of a high embankment slope in an airport become very outstanding. It is worthy of discussing in details combined with a specific project. In this paper, taking a typical western high embankment slope for example, the on-site monito- ring data are contrastively analyzed with numerical calculation to evaluate its slope stability conditions, under their com- bined effects of adverse engineering geology and topography. The results showed that：in high embankment slope, the maximum horizontal displacement of its bottom is 0.10 m, the maximum settlement is 2.0 m; the maximum horizontal displacement of its top is 0.22 m, the maximum settlement is 3.5 m ; the potential sliding surface does not take place ; the prediction results of numerical calculations is larger than actual monitored values, compared with the actual slope monito- ring results. We conclude that the deformation of the slope meets the engineering design requirements.