Research On Deformation And Failure Mechanism Of Stratified Slope In Gaotan Area Of Ziyang County,Qin-Ba Mountain Area

Qin-Ba Mountain area is located in the central and western regions of China.The topography in the region are complex and diverse,and the tectonic activities are fierce.They are the barriers for the continuity of traffic in the north and south of China,and are also the areas with high geological disasters in China.The geological disaster investigation results show that most of the geological disasters in the Qin-Ba Mountain are landslides,and the debris flow source is mostly caused by landslides and collapse accumulation within the channel.Therefore,in order to reduce the occurrence of landslide disasters and reduce the loss caused by landslide disasters,it is of great significance to carry out research on the Slope deformation development law and deformation failure mechanism.The article takes the Gaotan area of Ziyang County in Qin-Ba Mountain Area as the research area,Relying on the Investigation of Geological Hazards in the Valley of the Middle Hanjiang River undertaken by the Geological Survey Institute of Chang'an University.Through extensive relevant literature,engineering data collection,and geological disaster investigation on-site,explained the engineering geological conditions in the study area.Using GIS platform to classify the types of slope structures in the area,and summarize the types and development characteristics of slope disasters.Based on this analysis,the influence factors of slope deformation and major deformation failure mode are analyzed,And established a generalized model of slopes in the area,A systematic numerical simulation study of the deformation and failure of slopes was carried out.The main contents are as follows:1.Explained the engineering geological conditions in the area,and divided the slope units into the study area by GIS software,According to the rock dip(?),the slope is further divided into four categories: flat(<15°),gentle(15°~30°)median(30°~60°)and steep(>60°).Then it is divided into the above five categories of slope structure combination to divide 20 sub-structure types.2.Summarized the types and development characteristics of slope disasters in the area,For landslide hazards,divide according to material composition,form of movement,precipitating factors,degree of stability,volume of landslide,and shape of landslide profile,For the collapse disaster,the division is based on the failure mode,the volume of the dangerous rock mass,the height of the dangerous rock body from the slope foot and the stability.3.The mathematical statistics method was used to summarize the influence of landform,geological structure,lithology,hydrological conditions,and human engineering activities on the development of slope disasters.According to the geomechanical model,we summarized three basic deformation failure modes in the area: slip-pull,slip-bend and bend-pull,More complex slope failures are compounded by two or more failure modes.4.Based on the engineering geological conditions and the structural characteristics of the slope in the study area,establish a generalized model of the slope in the study area.The physical and mechanical test data of several typical landslide rock formations in the region are used for rock and soil mechanics parameters.Using 3DEC Discrete Element Software to Analyze Several Common Slope Deformation Failure Mechanisms in the Area,Discussed the effects of different rock formations on the deformation and failure of layered slopes.Summarizes the relationship between the slope structure and the deformation and destruction methods,and has important practical value for prevent and reduce disaster in the study area.