Volume 43 Issue 1
Jan.  2024
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GAO Xu. Analysis of the formation and evolution process of the Dalongchi landslide dam in the South Tianshan Mountains[J]. Bulletin of Geological Science and Technology, 2024, 43(1): 229-240. doi: 10.19509/j.cnki.dzkq.tb20230322
Citation: GAO Xu. Analysis of the formation and evolution process of the Dalongchi landslide dam in the South Tianshan Mountains[J]. Bulletin of Geological Science and Technology, 2024, 43(1): 229-240. doi: 10.19509/j.cnki.dzkq.tb20230322

Analysis of the formation and evolution process of the Dalongchi landslide dam in the South Tianshan Mountains

doi: 10.19509/j.cnki.dzkq.tb20230322
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  • Corresponding author: GAO Xu, E-mail: 1143501472@qq.com
  • Received Date: 07 Jun 2023
  • Accepted Date: 13 Sep 2023
  • Rev Recd Date: 11 Sep 2023
  • 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 structure 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-distance 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 dammingbody can provide a reference for the subsequent genetic analysis of similar studies in the southern Tianshan region.

     

  • The authors declare that no competing interests exist.
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