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3D finite element analysis on progressive failure of slope due to rainfall


Authors: Ye, G.L., Zhang, F., Yashima, A.
Source: Landslides and Engineered Slopes: From the Past to the Future.
Pages: 7
Date: 2008-06-15
Location: Xian, China

Abstract
A soft rock slope in Tokai-Hokuriku Expressway of Japan failed due to a heavy rain. The three-stage failure procedure indicates that it was a typical progressive failure. In this study, by using a modified elastoplastic model with Matsuoka-Nakai failure criterion, which not only can describe the strain-hardening and strain-softening behavior of soft rock but also can take into consideration the influence of the intermediate principle stress, a 3D soil-water coupled finite element analysis is conducted to investigate the mechanics of the progressive failure. The 3D shape of the slope, the geological conditions and the initial ground water level are delicately considered during 3D modeling. The change of the ground water level during rainfall is simulated by increasing the water heads of elements from initial level to the ground surface. In the discussions of the calculation results, the characteristics of slope failure, such as the development of shear strain, the deformation of ground, the propagation of shear band and the failure zone are discussed in detail. It is found that 3D soil-water coupled analyses based on the modified elastoplastic model can simulate the progressive failure of a slope to an engineering acceptable accuracy.

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This paper was added to our catalog on Thursday 26 November, 2009.

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