[Objective]Landslide dams are a geological body of key concern for engineering construction in alpine canyon areas.This paper takes the Dalongchi landslide dam in the South Tianshan Mountains as the research object to explore the origin and evolution process of the landslide dam in alpine canyon areas of the South Tianshan Mountains.[Methods]Based on satellite remote sensing images,regional data,field investigation,and geological drilling data in the Dalongchi region,combined with theoretical calculations and finite element discrete element simulations,this paper systematically delved into the deposit characteristics and the formation and evolution process of the Dalongchi damming body.[Results]The results show that(1)Many landslide scratches and grooves can be seen on the steep mountain surface on the North side of the Dalongchi damming body,of which the packing struc-ture has obvious inverse grading features and a jigsaw structure,and it is speculated that the formation may be caused by the accumulation of the high-speed and long-distance ancient landslide of Dalongchi.(2)By conducting the recurrence of the northern original surface of the Dalongchi landslide and theoretical calculation and numerical simulation on its kinematic characteristics,the results were then induced that there was a high-speed and long-dis-tance landslide on the north side of the mountain that led to the formation of the damming body of Dalongchi.(3)The formation and evolutionary phases of the Dalongchi damming body can be divided into the embryonic stage of ancient landslides,the river-blocking forming stage of the damming stage by ancient landslides,and the overlapping stage of ancient damming bodies.[Conclusion]The study of the formation and evolution of the Dalongchi dam-mingbody can provide a reference for the subsequent genetic analysis of similar studies in the southern Tianshan re-gion.
关键词
堰塞体/堆积特征/古滑坡/形成演化/大龙池
Key words
landslide dam/accumulation characteristics/ancient landslide/formation and evolution/Dalongchi
维普
万方数据