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- Title
Three-dimensional stability analysis of unsaturated slopes under variable rainfall conditions using a numerical method.
- Authors
Nian, Gengqian; Chen, Zhonghui; Zhang, Lingfei; Bao, Min; Zhou, Zihan
- Abstract
Rainfall infiltration is one of the main triggering factors for slope instability. To investigate the three-dimensional (3D) stability of a slope under variable rainfall conditions, a numerical method combining the numerical solutions of rainfall infiltration with the upper-bound theorem of the limit analysis kinematic method is proposed. The internal dissipation rate by apparent cohesion on failure surfaces in the energy rate balance equation is derived using the discrete summation method. Subsequently, the safety factors and failure patterns of a case slope under four types of rainfall based on the two-dimensional (2D) rotational mechanism are calculated and compared with the results of the built-in strength reduction method in COMSOL Multiphysics to verify the reliability of the numerical method. Furthermore, the 3D safety factors and failure patterns of the slope under the four types of rainfall are thoroughly analyzed. The results indicate that the increasing rainfall results in the smallest safety factor and the strongest effect on the slope stability. Compared to the relatively conservative safety factor based on the 2D plane strain, the 3D stability analysis has more practical importance. The present work may provide a feasible method for analyzing rainfall-induced failure of slopes.
- Publication
Bulletin of Engineering Geology & the Environment, 2023, Vol 82, Issue 2, p1
- ISSN
1435-9529
- Publication type
Article
- DOI
10.1007/s10064-023-03082-x