Simulation Analysis Of Rainfall Landslide In Low Liquid Limit Clay Embankment

With the construction of highways in our country,the amount of rain that can last a certain amount of time can cause more and more damage to the highway and it is mainly manifested in two aspects:Storms washed the shoulders and pavement,the formation of gullies,chicken feet ditch,destruction of the road and the roadbed into the size of the gap or the whole destroyed,namely scouring the gap;A large amount of rainwater penetrates into the slope of the embankment,so that the strength of the embankment soil is reduced,and the seepage force generated at the same time in a certain period of time.Rainfall is a common weather phenomenon,and rainfall can seep down from the earth's surface,so no matter what kind of rain in the course of rainfall will lead to changes in rock and soil seepage field.The change of seepage field of this rock and soil is an important index for the safe operation of expressway embankment.Therefore,the study of landslide damage under the action of rainfall seepage is of great practical significance to the safety of the project.Based on the previous studies,this paper further analyzes the relationship between rainfall seepage and landslide damage of highway embankment,and obtains the following results:(1)Comparing the safety coefficient of slope stability of low liquid limit clay soil under different seepage conditions,it is found that seepage force has an important influence on the stability of low liquid limit clay soil slope.So the action of seepage force must be considered in the practical engineering,otherwise it will make a mistake in the judgement of slope stability.(2)“The equivalent cohesion” of unsaturated soil is applied to denotative Mohr-Coulomb failure criterion,and the embankment slope soil plastic zone development situation is analysed by the finite element method.The results show that the local stability problem of embankment slope will occur under the action of rainfall,and the rainfall infiltration will first cause failure in slope angle,so special treatment must be take in the embankment slope angle.(3)According to the feasibility study of the artificial neural network to solve the geotechnical engineering problems and the numerical simulation of the damage identification process of a side slope whose height is 8m,it proves that the artificial neural network has the ability of pattern recognition.It is feasible to use the artificial neural network to solve the problem of geotechnical engineering structures,especially for the problem of structural damage identification.(4)For the single damage condition in structure,the artificial neural network can accurately identify the damage location and extent of damage.For the complex multi damage condition in structure,the substructure damage identification method is used to solve the problem,and it is divided into initial location of damage,accurate location of damage and identification of damage degree.In each step,a neural network is established to identify the damage,and the neural network can identify the structural damage accurately in each step.