Reserch On Macroscopic Index Method Of Hazard Assessment Of Seismic Landslides

China is located between the Pacific seismic zone and Euro-Asia seismic zone. Landslides and other geological disasters triggered by strong earthquakes lead to a large number of casualties and huge economic losses.To reduce the disaster losses caused by the earthquake slope, study on the mechanism of seismic landslides and the macro indicators evaluation method of landslide instability has become the main research topic in geotechnical engineering and earthquake engineering today.Slope collapse triggered by earthquake often swarms, and the distribution area is wide. The quasi-static method and the finite element method are usually used to analyze the stability of the landslide in the earthquake hazardous area zoning. The methods above need detailed geologic information and mechanical parameters, which causes high cost and the fact that the method can’t adapt to the need of large rang, more point prediction. In the primary stage of urban planning and earthquake emergency work, accurate projections for regional slope is not often needed.Macro judgment of the slope stability usually is usually given on the basis of existing data or simple field investigation.So the macro discriminant method of the slope instability is of practical significance to urban disaster prevention planning and earthquake emergency.This paper introduces the research situation of the landslide stability evaluation methods both at home and abroad and sums up the main factors affecting the stability of landslide. On the basis of previous studies, combined with China’s earthquake landslide as an example, it determines the lithology, geological structure, slope angle, slope height, the average annual rainfall, and earthquake intensity as the macroscopic evaluation index of slope instability under the actionofearthquake. The macro indicators can often be obtained from geological topography, hydrological data and seismic intensity data, etc., or through simple field work.This paper mainly studies rock landslides. And macroscopic evaluation indexes of instable slope and stable slope in Diexi earthquake, Luhuo earthquake, Longling earthquake, Songpanpingwu earthquake, Lijiang earthquake in Yunnan province are classified, valued and comprehensive index is calculated. From the above analysis, the critical value in judging slope instability is obtained to verify, and therefore macroscopic index evaluation method of earthquake slope is built. Through the instability criterion of slope instances under the action of Lushan earthquake, the feasibility of evaluation method is tested. This paper uses the static strength subtraction to conduct value simulate computation on typical slopes and contrast it with macroscopic indexes evaluation results. The research in this paper has great practical value on urban disaster prevention planning and post-earthquake emergency.