Geological genesis of the Juexue red strata landslide in Qamdo, eastern Tibet

The Juxue red strata landslide developed on the reverse slope formed in the northeast wing of the syncline, and it is a typical red strata landslide found in the newly defined "Qamdo red strata area" based on the geohazards survey along the Sichuan-Tibet traffic corridor in recent years. To determine its genesis, based on basic geology, detailed geological investigation and analysis are carried out. The results show that the stratigraphic lithology of the landslide area is mainly purplish red and gray thin mudstone and silty mudstone interbedded with middle-thick sandstone of middle Jurassic Dongdaqiao Formation (J₂d). The axial plane cleavage (S₁), X-type conjugate shear joints (S₂, S₃) and interlayer shear cleavage (S₄) are developed in the strata, which are compatible with regional tectonic activity. From the point of view that sedimentary environment controlling stratum lithology and physical and mechanical properties, regional tectonic evolution restricting slope structure and rock mass structural plane combination characteristics, and groundwater and gravity aggravating slope instability, it is suggested that Juexue red strata landslide is formed by the coupling mechanism of internal and external geological forces, which has certain reference value for regional red strata landslide prevention and control and Sichuan-Tibet transportation construction.