Dynamic Mechanism Of Soil Slope Stability And Finite Element Analysis

Our country is located in the southeast of the Eurasian continent. The east is strongly influenced by the Pacific seismic belt. The southwest and northwest directions are located in the Eurasian seismic belt. Since the last century, our country is subjected to more strong earthquakes.Analysis of the frequency and intensity of earthquakes in the past few decades, In recent years,the trend of earthquake development in China is mainly the characteristic of shallow source,intensity and high frequency. Earthquakes mainly occur in the regions of Midwest.Besides, China is a multi mountain country, so there are a lot of slope in the southwest of China, including natural slopes and artificial slopes. When the earthquake occurred, these slopes are very easy to lose, and it easily has landslide phenomenon. It will not only cause a lot of property damage, but also cause a large number of people injured to death. The main research work of this paper is as follows:(1)The theoretical significance of the subject of this paper is introduced, a brief analysis is made on the method of studying the stability of slope at home and abroad, the instability mechanism of slope under earthquake action and the evaluation criteria are summarized.(2)The basic principle of finite element strength reduction method is introduced in this paper, application and criterion of slope stability under earthquake action. It provides some value in geotechnical engineering analysis commonly used constitutive model.(3)Some characteristics of seismic waves are introduced, In addition, some related problems of soil dynamics are introduced.(4)Establish theoretical model, based on the typical experimental study, according to the finite element strength reduction method, static stability analysis of the model, only gravity.Respectively determine the safety factor of slope, and friction angle, relationship between cohesion and safety factor, the distribution law of stress and strain and the law of displacement distribution are obtained.(5)Typical seismic load of the model input, according to the visco elastic boundary and finite element strength reduction method, the stability of slope under dynamic action is studied,under the action of earthquake load. The safety factor of slope is established and the relationship between friction angle, cohesive force and safety factor. The distribution law of stress and strain and the law of displacement distribution are obtained. Compared with the previous static, it comes to the conclusion that the safety factor of slope is reduced under dynamic load and the drifts are larger.(6)There are a lot of research and analysis about the influence of seismic waves from different peak, different spectral characteristics and vertical seismic waves to slope stability.(7)For the design and prevent large-scale slope provides a strong theoretical basis.