基于强度折减法某公路加筋填方路堤高边坡稳定性分析

依托西南地区某公路改扩建工程,采用强度折减法基于有限元软件将加筋土路堤髙边坡和素填土路堤高边坡分层施工过程的稳定性演化历程进行对比分析,得到了对加筋土路堤高边坡设计的一些建议。对于路堤稳定性分析,无论计算所得最大塑性应变和最大位移所在的位置和大小如何,以计算终止时的折减系数作为稳定安全系数基本是可行的。采用素填土构筑高填方路堤.三种坡比方案(1:1.5,1:1和1:0.58)均不能满足稳定性要求,需要对填筑坡体采取加固措施。采用TDGD200土工格栅,竖向间隔2m满铺布置,在没有坡脚加强措施的情况下适中的坡比(1:1)相比较大(1:0.58)和较小(1.1.5)坡比的填筑方案效果更好。最后基于优化方案分析了道路交通荷载对高填方路堤边坡稳定性的影响,研究结果表明道路交通荷载对加筋土路堤高填方边坡稳定性的影响较小。

Stability Analysis on High Slope of Highway Reinforced Filling Embankment Based on Strength Reduction Method

In this paper,relying on a highway reconstruction and extension project in southwest China,the stability evolution processes of the high reinforced soil embankment slope and the high plain fill embankment slope in the layering construction process are compared and analyzed by the strength reduction method based on the finite element software.Some suggestions on the design of high slope of reinforced soil embankment are given.For the stability analysis of embankment,it is basically feasible to take the reduction coefficient of calculation termination as the stability safety coefficient no matter what is the position and magnitude of the calculated maximum plastic strain and the maximum displacement.The plain fill is used to construct the high filling embankment.Three slope ratio schemes(1:1.5,1:1 and 1:0.58)cannot meet the stability requirements.The reinforcement measures should be taken for the filling slope.TDGD200 geogrid is used,and the vertical spacing is 2-m full layout.The effect of moderate slope ratio(1:1)filling scheme is better than the larger(1:0.58)and smaller(1.1.5)slope ratios under the condition of no slope foot reinforcing measures.Finally,based on the optimization scheme,the influence of road traffic load on the stability of high filling embankment slope is analyzed.The results show that the road traffic load has little influence on the stability of the high-filling slope of reinforced soil embankment.