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Étude du comportement d'un milieu rocheux fracturé : application à la réalisation du tunnel de St Béat (France 31)

Abstract : The design of civil engineering structures in fractured rock masses requires knowledge of their mechanical behavior. The fractured rock masses are usually very complex and separated in matrix and rock discontinuities. This thesis aims to study the mechanical behavior of St Beat tunnel rock mass. The thesis is divided into three parts. We study first the predominant phenomena and factors affecting the mechanical behavior of rock masses. In the second part, we perform separately experimental studies on the mechanical behavior of matrix and rock discontinuities. Finally, in the last section, we present a 2D model of the fractured rock mass behavior during the digging of the tunnel. The experimental study is based on the marbles encountered on the future tunnel site. The rock matrix behavior is studied using triaxial compression tests on intact rock samples. The damage evolution is characterized using propagation velocities measurements of elastic waves. A failure envelope by Mohr-Coulomb linear criterion is proposed for the rock matrix. The shear behavior of natural discontinuities is investigated under different loading conditions (normal stress or constant normal stiffness imposed). The discontinuities surfaces topography is measured before and after each mechanical test to determine the roughness statistical parameters. The influence of the normal stress, the normal stiffness, the initial roughness and the shear rate on the discontinuities behavior is demonstrated. A behavior law is proposed for each type of test.The mechanical properties obtained are introduced into the code UDEC to model the rock mass behavior with the presence of the tunnel, under different boundary conditions. The response in terms of deformations and stresses induced around the tunnel is analyzed
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Submitted on : Wednesday, June 15, 2011 - 4:23:18 PM
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Thi Than Nhan Hoang. Étude du comportement d'un milieu rocheux fracturé : application à la réalisation du tunnel de St Béat (France 31). Autre. Université Paris-Est, 2010. Français. ⟨NNT : 2010PEST1066⟩. ⟨tel-00600684⟩

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