Dynamic Stability Analysis Of Layered Soil Slope Under Seismic Action

The stability analysis of slope under earthquake is one of the important subjects in geotechnical engineering and earthquake engineering.In recent years,infrastructure construction is in a period of rapid development.There are more and more slope stability problem.Damage resulting from earthquakes may be directly attributable to the effects of the earthquake or may be an indirect result of direct earthquake damage.Likewise,direct damage from earthquakes may result from both the primary impacts from the earthquake,such as ground shaking and fault displacement,or from second impacts,like landslides and soil liquefaction,generated.by the primary impacts.Slope instability seriously threaten human life and property safety.It is important to analyze the dynamic stability of slope under earthquake.Based on the G317 highway reconstruction project,the dynamic stability of the layered soil slope have been researched.The main contents of the thesis are as follows:(1)It is found that the deposit slope is a major geological hazard that seriously threatens the security of the highway.The layered slope is more than half of the deposit slope.Based on typical slope structure,calculation model is determined.(2)Failure modes under different parameter combinations are analyzed.If the cohesive soil is located in the upper or middle layer,failure mode is crack-slide-shear.If the cohesive soil is located in the lower layer,the top of the slope will appear local collapse.(3)The factors that may affect the dynamic response of the slope are researched,including the slope structure,ground motion peak,time,spectrum characteristics and so on.It is found that the soil with poor mechanical properties is more sensitive to the dynamic load.It is assumed that the amplification factor is logarithmically related to the peak acceleration.The variance indicated that fitting is good.According to the rule of homogeneous soil slope,the amplification factor of stratified soil slope can be obtained by taking cotangent of amplification curve into the layered soil slope.(4)The seismic coefficient of pseudo-static method is improved.Based on the principle of energy,seismic coefficient can be equivalent to acceleration time-history curve.Considering acceleration amplification effect,the dynamic analysis method based on the acceleration difference theory is improved.Finally,the stability evaluation methods are validated by a typical slope.Based on the calculated results,the application conditions of the two stability analysis methods are summarized respectively...