(1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection，Chengdu University of Technology，Chengdu，Sichuan 610059，China；2. Huaneng Tibet Hydropower Safety Engineering Technology Research Center，Nyingchi，Tibet 860000，China)
Abstract：Under the background of global warming，rock and glacier-related geohazards on the Qinghai-Tibet Plateau are increasing gradually. Wedge landslide is a typical instability form of rock slope in alpine regions. To study the initiation mechanism and failure processes of wedge landslide，the centrifugal model tests under various freeze-thaw cycles and hydraulic conditions were carried out with a self-designed temperature control device adapted to geotechnical centrifuge. The results show that：(1) the failure processes of wedge landslide in alpine regions can be summarized into four stages，including the crack generation stage，creep deformation stage，crack accelerated expansion stage and wedge instability stage. (2) Melt water is a critical catalyst for the initiation of wedge landslide in alpine regions and its impact on landslide instability is both long-term and sudden：on one hand，the deterioration of rock mass structure affects the long-term stability of the landslide；on the other hand，the sudden instability of the landslide is caused by the surge of pore water pressure on the structural plane. (3) The freeze-thaw cycle is a significant external driving force for the initiation of wedge landslide in alpine regions，which causes frost heaving damage to the rock mass structure in the freezing process and the deterioration of the rock mass structure and the surge of pore water pressure in the melting process. The freeze-thaw centrifuge test method can relatively truly reproduce the evolution process of wedge landslide under the action of melt water and freeze-thaw cycle. The initiation mechanism of wedge landslide in alpine regions are preliminarily revealed，which lays a foundation for further exploring the influence laws of relevant factors.
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2023, Vol. 42 
