降雨作用下碎石土高填方边坡渗流及稳定性分析

Seepage and Stability Analysis of High Fill Embankment with Debris Under Rainfall Events

降雨是诱发滑坡的主要环境因素。填料的类别及压实度直接影响整个雨水下渗过程。利用非饱和渗流有限元软件模拟降雨入渗时高填方边坡的瞬态渗流场,采用有限元计算得到单元应力,将单元应力应用到极限平衡分析,分析得到降雨过程中雨水下渗过程及边坡稳定性。研究表明,灰岩碎石土压实度在90%~95%,渗流特性较好,在暴雨工况下稳定性良好。其成果将为高填方边坡选取填料及后期病害防治提供科学依据。

The rainfall is the main environmental factor that triggering landslides.The soil types and degrees of compaction of the backfill materials will directly affect the rainwater infiltration pattern within the embankment.The transient seepage field of high fill embankments subject to the rainwater infiltration is simulated by an unsaturated seepage finite element software.The element stress field is obtained by the finite element method.The element stress is then applied to the limit equilibrium analysis.The slope stability under the seepage action under the precipitation conditions can therefore be analyzed.The results show that the degree of compaction of limestone gravelly soil between 90%-95% have a good performance under seepage conditions.It is also stable under the strong rainfall events.The results will provide scientific basis for selecting backfill materials and minimizing and mitigating hazards induced from strong precipitations.