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Numerical modelling for Dynamic Instability Process of Submarine Soft Clay Slopes Under Seismic Loading

Journal of Ocean University of China 2021年第5期20卷 1109-1120页

作者： MI Yang WANG Jianhua CHENG Xinglei YAN Xiaowei State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China Geotechnical Engineering Institute Tianjin UniversityTianjin 300072China

Marine geological disasters occurred frequently in the deep-water slope area of the northern South China Sea,especially submarine landslides,which caused serious damage to marine *** cyclic elastoplastic model that can describe the cyclic stress-strain response characteristic for soft clay,is embedded into the coupled Eulerian-Lagrangian(CEL)algorithm of ABAQUS by means of subroutine interface *** the basis of CEL technique and undrained cyclic elastoplastic model,a method for analyzing the dynamic instability process of marine slopes under the action of earthquake load is *** rationality for cyclic elastoplastic constitutive model is validated by comparing its calculated results with those of von Mises model built in *** dynamic instability process of slopes under different conditions are *** results indicate that the deformation accumulation of soft clay have a significant effect on the dynamic instability process of submarine slopes under earthquake *** cumulative deformation is taken into our model and this makes the calculated final deformation of the slope under earthquake load larger than the results of conventional numerical *** different contact conditions are used for analysis,the smaller the friction coefficient is,the larger the deformation of slopes will be.A numerical analysis method that can both reflect the dynamic properties of soft clay and display the dynamic instability process of submarine landslide is proposed,which could visually predict the topographies of the previous and post failure for submarine slope.

关键词： submarine slope saturated soft clay coupled Eulerian-Lagrangian cyclic elastoplastic model dynamic instability process

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