沟谷区域不稳定边坡稳定性数值分析

NUMERICAL SIMULATION OF UNSTABLE SLOPE IN GULLY AREA

城区土地资源日趋紧张,工程建设逐步向山地沟谷区域扩张,但对于沟底回填对不稳定边坡稳定性的影响尚缺乏深入研究。采用有限差分强度折减法建立数值分析模型,分析填土的回填比及其内摩擦角对边坡稳定的影响,并利用此方法对现实工程进行模拟验算。结果表明:随着回填比h/H的增大,边坡稳定安全系数Fs随之增大;在达到一定回填比h/H后,边坡稳定安全系数F;开始随填土体内摩擦角φ2增大而增大;对一边坡模拟采用沟底回填方法后,边坡趋于稳定。

With the increasing shortage of land resources in urban areas,engineering construction is gradually expanding to mountainous and gully areas.However,there is still a lack of in-depth research on the influence of backfilling at gully bottom on the stability of unstable slope.The finite difference strength reduction method is used to build a numerical analysis model to analyze the influence of backfill ratio and internal friction Angle on slope stability,and the simulation checking is carried out with this method to the real project.The results show that with the increase of backfilling ratio h/H,the slope stability safety factor FS increases.When the backfilling ratio h/H reaches a certain level,the slope stability safety factor Fs begins to increase with the increase of the internal friction Angle φ2 of the filled soil.In the simulation of a slope,the slope tends to be stable after backfilling at the bottom of the ditch.