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Numerical Simulation of a Creeping Landslide Case in Japan

Creeping landslides are one of the major natural disasters in mountainous regions. Therefore, study of the creeping behavior of a landslide and associated Geotechnical issues are important. This study has addressed and evaluated the creeping behaviour of a the Tomuro landslide Gunma, Japan induced by snow melt water using the 2D-FEM based elasto-viscoplastic constitutive model as a case study. Two new control constitutive parameters were incorporated in the numerical model for the first time to better understand the creeping behaviour of a landslide. Such control constitutive parameters were estimated based on the relation between the total factor of safety, calculated by the various Limit Equilibrium Methods such as Ordinary Method of Slice (Fellenius 1936) (case I), Bishop’s Method (1955) (case II), Janbu’s Simplified Method (1973) (case III), and Finite Element Method (case IV), and the field monitoring displacement rate of the Tomuro landslide. In addition, the snowfall precipitation was also considered during the calculation of total factor of safety using both limit equilibrium methods and finite element method. Others required material parameters for landslide simulation were calculated based on the field investigation and laboratory tests of the collected blocked samples. First, the predicted and measured time histories of horizontal displacement of the Tomuro landslide was compared for the validity of the proposed numerical model and found in good agreements with each other. Then, the simulation results of deformation pattern and shear strain pattern were presented and discussed. Finally, the possible failure mechanism along the slip surface of a landslide induced by snow melt water was discussed.

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