Study On The Evolution Mechanism Of Qinyu Landslide

The geological background of Longnan Mountain is complex,and landslide hazards are widely distributed and numerous,landslides of a large pile-up nature are particularly developed in this region,such landslides are mostly distributed on both sides of the river and are characterized by phases in time and space,with landslides exhibiting plastic flow characteristics that can easily be reslid.The monitoring and prevention of landslide hazards in the region is costly and difficult to universalize due to a number of factors.In this paper,the Qingyu landslide in Qiujiashan Village,Dangchang County,Longnan City,is used as a research object to explore an economical and effective comprehensive research method for landslide hazards,based on which the sinking mechanism of the Qingyu landslide creep is studied.The main results are as follows.(1)The macroscopic deformation of landslides was discovered by using historical satellite imagery in multiple periods;drone monitoring means were selected to obtain information on surface deformation and deformation patterns of landslides and to determine the focus of subsequent research;the mechanism,mechanism and pattern of deformation of landslides were studied in depth in conjunction with field research.The above-mentioned methods are low cost and high efficiency,and are effective in the current study of the Qingyu landslide.(2)The evolution of the Qingyu Landslide is inherited and distinct in time and space.The complex geological environment is the main geological background of landslide evolution;special landslide features,earthquakes,rainfall,erosion of river gullies,human engineering activities are the main inducing factors of landslide deformation.(3)Monitoring and survey results indicate that the Qingyu landslide deformation occurs mainly in the middle and front of the slide.Longitudinally,the deformation is manifested as the law of large front and small back,gradually becoming larger from the back to the leading edge;transversely,the law of large position on both sides and small position in the middle.(4)The Qingyu Landslide D area is currently the most unstable area.The displacement of D area gradually increases from back to front,and the overall displacement rate shows a gradual increase;the amount of sedimentation is small in the rear,the central and front positions are large,and the rate of sedimentation from back to front,first increase then decrease.The deformation pattern of this zone is traction motion of the front matter-horizontal motion of the central matter-pushing motion of the rear matter.(5)Numerical calculations show that the D-zone stress strain is mainly concentrated near the stratigraphic subinterface and potential slip surface,which is the main cause of creep occurrence.The landslope is now in the potential energy accumulation and adjustment phase,and creep is increasing.The numerical calculations are consistent with the actual monitoring and survey results.