Research On The Stability Analysis And Landslide Prediction Of Soil Slope Under Rainfall Conditions

Our country is a mountainous country with mountain areas accounting for about two-thirds of the land area.In the context of global warming,extreme weather occurs frequently and rainfall tends to trigger debris flow.Debris flow,mixed with a large number of solid substances,is a complex multiphase fluid which can cause huge damage or injuries.Both natural and human factors can contribute to stochastic occurrence of debris flow.So how to reasonably determine the impact of rainfall on the slope is an important issue for landslide prevention and control.This paper proposes a method for slope stability analysis under rainfall conditions.The debris flow warning model is established on this method to analyzed debris flow.The effects of runoff and subsurface flow on slope stability are studied on condition of rainy day.The coupled surface-subsurface flow model based on the water conservation theorems is established.Then the differential solution format of infiltration and runoff is derived.Coupling the runoff and seepage equations of two difference schemes,the effects of rainfall intensity,rainfall duration Time,soil initial water content and porosity,and soil saturated permeability coefficient on slope soil infiltration are analyzed.Secondly,by analyzing and calculating the safety factor of slopes above Zf with different wetting depths under the condition of rainfall,the possibility of debris flow generation is analyzed with reference to the safety factor,a calculation model of slope stability under rainfall is established.And relative calculation program is compile to solve Safety factor on the different wetting side slope.Again,paper creates a new idea of early warning method which makes prediction of possible outcomes of debris flow by the different safety factor classification.By analyzing the safety factor of slope,it is possible to predict the occurrence of debris flow at different classification levels,and then to realize the prediction of debris flow.Finally,case analysis further verify the feasibility and correctness of the method proposed in the paper.Based on the study of the influence of rainfall conditions on the slope,a new computational mechanism for studying the coupling between runoff and seepage under rainfall is put forward.At the same time,an early warning method for predicting debris flow based on the slope safety factor is established.The case study further proves that this method Correctness and rationality...