| The research of slope stability under earthquake power is of great significance to the high incidence of earthquake in southwest China.This paper takes Xishancun landslide as the research object,based on the investigation and analysis of the geological data related to the study area and the landslide shape,geological structure characteristics and macroscopic deformation characteristics of Xishancun landslide,this paper analyzes the dynamic response of the loading and unloading response of Xishancun landslide under the action of seismic dynamic power.The main research content has the following aspects:(1)Analyzed the basic engineering geological conditions of Xishancun landslide in Lixian County.The results show that the material composition,structural characteristics,strength and permeability of the landslide are studied,and the basic geomechanical performance data of the landslide are studied.The results are provided for the subsequent numerical simulation and the parameter value.(2)Based on the monitoring data of Xishancun landslide and its macroscopic deformation characteristics,the landslide is deformed and the deformation characteristics of each deformation zone are studied,and the formation and deformation mechanism of landslide are analyzed.(3)The dynamic response characteristics of Xishancun landslide under earthquake action are studied.The dynamic Lagrangian difference method is used to study the dynamic characteristics of displacement and deformation rate of Xishancun landslide under earthquake power,and its deformation characteristics are analyzed,and the simulation results are discussed.(4)According to the numerical simulation results of deformation,the displacement,velocity,acceleration and unloading response of Xishancun landslide under different dynamic loads are analyzed and analyzed by using unloading and response ratio theory.(5)Based on the criterion of loading and unloading responsiveness,the stability of Xishancun landslide under the action of seismic power is quantitatively analyzed and compared with the conventional slope stability analysis method to verify its correctness.Through the above research,the following conclusions and achievements are obtained:(1)Xishancun landslide is located in Lihua County,Tonghua Township,the left bank of the valley,the geographical coordinates of latitude 30°54'43 ",longitude 102°32'46".The landslide as a whole on the front of the narrow long stripes,the front edge of the landslide is about 1010 m from the valley of the glacier,and the left and right sides of the landslide are bounded by the gully.The trailing edge of the landslide is bounded by an upright landslide wall,and the trailing edge elevation is about 3300 m.The height of the landslide is about 1790 m,the length of the landslide is about 3800 m,the average width is about 680 m,the maximum width is about 980 m,the thickness of the landslide is between 10 ~ 80 m and the whole scale is about 1.7 × 108m3.There is no obvious slip band.(2)The deformation area of Xishancun landslide is mainly distributed in the left front and left middle of the landslide.According to the deformation characteristics of the landslide,the deformation can be divided into three regions: I,II and III,Area second,? area smaller.Based on the comprehensive macroscopic deformation and detection data,the present landslide resurrection is traversed landslide,and the deformation mechanics model is creep-rupture.(3)The response of Xishancun landslide to seismic load is characterized by non-linearity,and the response of different landslides is obvious.The seismic response of the landslide is characterized by the larger front and the center of the landslide.The seismic response of the deep landslide is characterized by the larger middle and the trailing edge.At the same time,the seismic response of the Xishancun landslide is greater than that of the landslide.In addition,the dynamic response of the landslide under the seismic load also shows anisotropy in the space,and the dynamic response of the landslide in the horizontal direction is larger than the vertical direction,which indicates that the landslide is deformed mainly in the direction of the temporary surface The(4)The seismic response of the Xishancun landslide is lagging behind,and the more the dynamic response of the monitoring point on the surface of the landslide is lagging behind,the more shallow the dynamic response is.(5)Different types of seismic waves have a great influence on the dynamic response to the slope.At the same vibration intensity,the vibration frequency of the seismic wave is higher,and the deformation of the particle on the slope is about linear.On the contrary,the deformation of the particle will show the trend of increasing the cyclical fluctuation.Also with the increase of the vibration frequency,the slope of the dynamic response to the more active,the response time is getting shorter and shorter.In addition,as the amplitude of the vibration increases,the displacement of the post-earthquake slope increases.(6)The loading and unloading response of Xishancun landslide under the action of seismic force shows the characteristics of fluctuating fluctuation around 1.0.When the response timing curve exhibits a non-linear characteristic,the corresponding load shedding response ratio curve will show a peak.At the same time,the loading and unloading response ratio of the same loading and unloading parameters will be similar to the fluctuation trend,which shows that the change of the unloading response ratio is only related to the change trend of each parameter.(7)The minimum loading and unloading responsiveness of the Xishancun landslide under the earthquake load with the peak acceleration of 5s and the acceleration of 0.15 g is 1.19,which indicates that the landslide is still in stable state.This study is of great practical significance to prevent the geological disasters of landslides in the southwest mountainous areas and maintain the people's lives and property.It also provides the reference for the stability evaluation of Xishancun landslide in the future earthquake. |
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