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Etude de l'interface sol-structure dans les milieux granulaires à l'aide d'un nouvel appareil de cisaillement annulaire

Abstract : Many civil engineering problems involve interaction between soil and structural elements. The load transfer takes place in a very thin zone of soil, called interface. A new apparatus, the ring simple shear apparatus, has been developed in order to investigate the behaviour of interface between a granular material and a steel structural element. In a first time, a detailed description of this new apparatus is presented. The principle of the test with the ring simple shear apparatus consists to shear the intern part of a ring soil sample by a steel cylinder in rotation. The end effects are reduced and the loss of material is nil. Normal stresses are directly measured at the interface with specifically designed cells. Then, monotonous test are described, performed with Hostun RF sand and Hostun 14-10 gravel samples. A synthesis underlines the main factors which affect the interface behaviour : initial radial external pressure, limit conditions, density of the sample and roughness of the structural element. A visualisation of the grain motion inside the interface has been performed with three studies : direct visualisation during test with 14-10 gravel, realisation of test with Schneebeli roll sample, with an adapted configuration of the apparatus and numerical simulation with a distinct element code, called LMGC. This approach, at a microscopic level, shows the fundamental role of the media micro structure in the formation of the interface, where grains undergo large displacements and rotation. At this end of this work, a synthesis of first cyclic tests is presented. The major part of the amplitude of shearing is analysed.
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Submitted on : Friday, September 24, 2010 - 8:56:17 AM
Last modification on : Wednesday, November 29, 2017 - 9:52:29 AM
Long-term archiving on: : Saturday, December 25, 2010 - 2:34:28 AM


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  • HAL Id : tel-00520678, version 1



Patrick Lerat. Etude de l'interface sol-structure dans les milieux granulaires à l'aide d'un nouvel appareil de cisaillement annulaire. Matériaux. Ecole Nationale des Ponts et Chaussées, 1996. Français. ⟨tel-00520678⟩



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