Analyse numérique de la stabilité des pentes renforcées par pieux.

Abstract

The assessment of slope stability is attributed to various critical conditions; one of which is the selfweight sliding stimulus, and the other one induces failure caused by a surface load condition (shallow foundation). In the particular case of a shallow foundation situated on a slope crest, the bearing capacity is significantly reduced. Therefore in practice, anti-slide piles are used to enhance the performance of the nearby footing. Whereas, the studies tend to rely on the hypothesis of purely vertical surface load condition. The present dissertation aims to contribute to the numerical and stochastic analyses by inducing vertical retaining structures, in order to deal with the group problem of slope stability and bearing capacity of an adjacent combined loaded strip footing. Firstly, a bibliographical research is presenting the most common deterministic and probabilistic methods, pertaining to slope stability assessment and bearing capacity of a shallow foundation. Followed by a presentation of bibliographical synthesis concerning studies published in the literature. The second part furnishes a contribution to the numerical analysis using the finite element software OptumG2. The investigation of the factor of safety is conducted under various conditions of a pile row, using elastoplastic shear strength reduction method. Thence after, a conducted study is done on the effect of reinforcing a cohesive slope by a row of multiple number of piles and a sheet pile wall on the undrained bearing capacity of a rigid strip footing, using the limit analysis.