The Study Of The Relationship Between The Stability Of Expansive Soil Cutting Slope And Rainfall

The expansive soil is a kind of high plastic clay with high particle dispersion. It’s main components are Montmorillonite and illite. It is sensitive to the change of environmental science. It has obvious characteristics of water swelling softening, shrinkage cracking, repeated deformation and strength changes. Engineering properties of expansive soil is poor. Engineering problems caused by the expansive soil swelling shrinkage, especially the destruction of light constructions and roads has caused great disaster to human beings. Expansive soil slope instability is a major engineering problem in Expansive Soil Area. Expansive soil slope instability is related to rainfall infiltration, and many landslides have occurred during the rainfall or after the rainfall in a short period of time, therefore, it is a great significance to study expansive soil slope stability subjected to rainfall.In this paper, the basic principle of SEEP/W and SLOPE/W are described in detail. The paper has summed the flow chart of the two modules and how to set parameters. In order to study the effect of rainfall on expansive soil slope seepage and stability, this article in view of a road cutting slope of expansive soil in Kunming hub southeast loop from Kunyang to the Kunming South Railway Station, according to the excavation process, simulation of different rainfall intensity and rainfall duration, use SEEP/W to analysis various situations of seepage. Then import the result into SLOPE/W to calculation the safety factor of stability under different rainfall conditions. If stability is insufficient, we can take the engineering measures. The results of theoretical analysis applied to the actual construction.