Preliminary Study On Classification And Graph Of Identification Of Large-scale Landslides In Western Mountainous Areas

In the western mountains,the geological conditions are complex and the geological structure is very frequent.In the extreme weather,human engineering activities and strong earthquakes,it is easy to form large and giant landslides with large scale,sudden,concealed and destructive.The early identification of large-scale landslide is an important measure for disaster prevention and mitigation of human engineering activities,and provides important theoretical basis for monitoring and forecasting landslide.The early identification and early warning forecast of large-scale landslide hazard with concealment and sudden characteristics has become the hot and difficult point of attention in the field of international landslide research.Therefore,this paper discusses and studies the construction of large landslide classification and identification graph in western mountainous area.(1)Based on the mechanism-key factors of the slope deformation model will be the western mountains of large landslides are divided into 19 categories:(1)block toppling,(2)compression-toppling,(3)shallow toppling,(4)deep toppling,(5)creep-tension cracking,(6)creep-tension cracking-shearing,(7)compression-tension cracking-shearing,(8)collapse-tension cracking-shearing,(9)slide–shearing,(10)slide-tension cracking(soil),(11)slide-tension cracking(rock),(12)rotational-tension cracking,(13)wedge slide,(14)translational-gliding,(15)appartent dip slide,(16)plastic flow-tensile,(17)step-path slide,(18)slide-support arch,(19)slide-Bending.(2)A total of 44 landslides(appendix A2)have been developed for the 19 categories of landslides in the western mountains.And the typical landslides in the western mountainous areas have been classified according to the above methods.and the formation and dynamic evolution of 16 landslide cases have been analyzed in detail.Based on the analysis of typical examples,the necessary conditions(topographic and geomorphological conditions,lithologic structure conditions,induced conditions)and the evolution process of each type of landslide are summarized.(3)The construction method of large landslide identification map is established.Based on the principle of perspective method of 19 types of landslide,the drawing of the deformation phase is carried out by computer aided design soft AutoCAD and Adobe Photoshop drawing software,and the corresponding identification indexes are summarized for each stage.And finally form a complete set of 19 landslide profiles including the original topographic map,early identification map,precursor discriminant map and disaster pattern recognition map(appendix A1).