Study On The Dynamiac Responses Of Landslide Engineering Under Earthquake Action

Seismic landslide stability is the geotechnical engineering and earthquake engineering study,one of the hot issues.Tt is important academic significance and application value for a high-incidence and high-intensity earthquake area to analyze of seismic dynamical response feature.In this paper,in order to internal rules landslide under the action of the seismic load have a further understanding,take the K81 landslide of the national highway 216 as an example based on full study to engineering geological conditions,implements FLAC3 D numerical simulation methods to carry out the seismic response and stability of a number of preliminary research.(1).This paper analyzes the stability of landslides by qualitative analysis.Combined the qualitative analysis,the whole stability,partial stability and stability of the upper of part of the steep slope of the landslide are analyzed comprehensively.However,if suffered earthquake and continuous rainfall,it is highly possible to be remobilized and slip again,so it is necessary to take measures to keep this landslide stable.(2).The author creates model by ANSYS,layout 12 monitoring points in landslide body,implements FLAC3 D numerical simulation methods to study dynamic response of the landslides under the earthquake.According to numerical simulation results,we can arrive at the following understanding:(1)According to the monitoring points of the acceleration time curve records,there is an amplificatory to the input seismic waves from landslide,the PGA magnification coefficient of the landslide slope increases first and then decreases with the increase of the elevation and the PGA magnification coefficient of the landslide increases with the increase of the elevation;According to the monitoring points of the displacement time course records,under the earthquake,the horizontal displacement of the surface sediments of the landslide is larger,and the displacement time-history curves of the slopes are consistent,and only the amplitude of displacement changes;(2)The PGA magnification coefficient of the landslide increases with the increase of the input seismic amplitude,and the PGA magnification coefficient of the landslide decreases with the increase of the input seismic wave frequency;(3)Under earthquake,the tensile failure is gradually developed and the lower part of the tensile failure is gradually expanded and extended to headpiece with the role of the earthquake,in the process of the earthquake,the surface of the jointed rock slope is destroyed by tensile failure and when the slope rock and soil interface formed a through the shear strain concentrated area,the plastic damage zone is extended and the stability is reduced of the landslide,then the landslide will occur slump destruction along the shear strain concentrated area,...