Stability Analysis Of Xipan Highway Slopes Under Earthquake Action

Seismic stability of slope is one of hot problems in geotechnical seismic engineering and earthquake engineering field. That complexity of the composition of geological and constitutive relationship and speciality of earthquake ground motion with strong randomicity make slope seismic stability difficult.Based on the previous study on the stability of slopes under earthquake action, the author did a widespread investigation of slopes along the Xipan highway. Through the analysis of the risk of earthquake along the route, the author gives out the evaluation of the disaster and gave the zonal spot of earthquake intensity. These engineerings are divided into five types. According to the criterion, the thesis calculates these engineerings useing two actual waves and one artificial wave. It is required that the designed structures can resist against minor earthquake without any damage, resist against moderate earthquake with repairable structural damage and resist against strong earthquake without collapse. The thesis calculates these engineerings using static finite element method and dynamic finite element method and pseudo-static method and newmark method. the thesis includes nine engineerings, and the result shows that Dechang landslide and K41+490 slope will be destroyed under strong earthquake, the others can keep their stabilities. The thesis evaluates every engineering's stability and disaster pattern. So, we can grasp the whole situation of these engineerings along the Xipan highway. The result settles the foundation for rescue scheme that should be adopted after earthquakes.The thesis studies the acceleration amplification coefficient to the height of slopes. In the studied height range, the following conclusions can be drawn:1) For the same slope, the acceleration amplification coefficient of artificial wave is large than the one of actual waves to the same height.2) For different slopes, the acceleration amplification coefficient is between 1.0 and 2.0 rather than increasing with the increasing of the height all the while.3) To the same height of a slope, the larger the seismic intensity is, the smaller the acceleration amplification coefficient is; the smaller the seismic intensity is, the larger the acceleration amplification coefficient is. (4) For actual waves, below 1/3 or 1/2 of the total height, the acceleration amplification coefficient grows slowly to the increasing of the height, but it grows quickly to the increasing of the height above 1/3 or 1/2 of the total height. For artificial wave, the acceleration amplification coefficient grows to the height of slopes as a linear relationship.