Engineering Mechanics Institute Conference 2013

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Genetic algorithm of slope stability of earth-rockfill dams

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Nansheng Li
Tongji University

The Mohr-Coulomb Failure Criterion has been widely used to explain the cases of slope stability. We have a great deal of need on considering the nonlinearity of failure mechanism in stability analysis of geotechnical engineering. The nonlinear Unified Strength Theory (UST) brought forward by Professor M.H. Yu in 1991, which takes into account the effect of intermediate principal stress and nonlinear behavior on geotechnical strength, is applied in slope stability analysis of earth-rockfill dams (ERD) in this paper. The Slices Method (SM), based on the rigid body limiting equilibrium theory and most widely used in slope stability analysis of ERD, is one of various methods of slope stability. The biggest drawback for general determination of slip surface is that must presuppose the shape of slip surface and unable to identify the most dangerous non-circular critical slip surface more accurately and rapidly. This paper proposes an optimal analytic model of slope stability analysis of ERD and employs genetic algorithm (GA) to search for the slip surface on the basis of shear-crack failure criteria of the nonlinear UST without prior assumption of the shape of slip surface. The application of GA to the slope stability analysis of ERD shows that GA can consequently overcome the weakness of easily falling into local optimal solutions brought by general optimal algorithms, subsequently illustrating the numerical results precise and reasonable.


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