Deformation Mechanism and Stability Analysis of a Giant Landslide at the Right Bank of the Yalong River
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Abstract:
A landslide is located in the monoclinal structural zone at the right bank of the proposed Kala hydropower station in the Yalong River Basin, and it has a square distribution and a volume of 1.22×108 m3with a main slide in NE direction. The local surface creep deformation occurs in the middle and lower parts of the landslide, and its deformation mechanism is the peristalsis~cracking~sliding type. Based on the field geological investigation and exploration results, the elastic finite element method was used to simulate the landslide deformation in consideration of the geological conditions of the landslide. The results showed that (1) the landslide is stable under natural conditions, and the maximum shear stress is located around the sliding zone with a value of about 0.27 MPa; (2) the horizontal displacement is dominated in the middle and lower parts of the landslide, and the landslide is sensitive to the constraints of force under the action of the gravity; and (3) the vertical displacement is dominated in the upper part of the landslide.
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