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Theses

Etude expérimentale et numérique de l'interaction sol-structure lors de l'occurence d'un fontis

Abstract : The subsidences of great width result from the collapse of underground cavities resulting from the human industrial activity (mines or careers) or formed naturally by the water in soluble solid masses of rocks (limestone, gypsum). Their impact on the existing buildings on the surface is generally very important as attest some of the recent examples of Auboué (1996), Moutiers (1997) and Roncourt (1999) which damaged more than five hundred buildings or the sinkhole on site METEOR (PARIS) in 2003. It is thus necessary to consider the movements of the ground at the surface (settlements and horizontal deformations) resulting from these phenomena and especially to determine the influence which can have the presence of one or more superficial structures on the form and the amplitude of these movements. The thesis program is based on the evaluation of urban risks due to the soil movements caused by underground cavities and the soil-structure interaction.

The first part is focused on the design of a small-scale bidimensionnal physical model that allows the representation of a sinkhole-like cavity collapse. It brings an innovating contribution to the design of 1g small-scale physical model by the development of a cohesive analogical material, derived from the Schneebeli material. Tests are then proceeded in order to determine the influence of soil-structure interaction during a sinkhole.

A numerical model is then setup using two different approaches at the same time: a continuum approach and the Distinct Element Method. Results provided by this model are compared with those from the tests performed on the small-scale model.

The last step is a confrontation of this computation tool in an attempt of back analysis of a sinkhole that did one casualty near Paris in 1991.
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https://tel.archives-ouvertes.fr/tel-00145223
Contributor : Matthieu Caudron <>
Submitted on : Thursday, May 10, 2007 - 9:46:44 AM
Last modification on : Monday, October 19, 2020 - 10:56:04 AM

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  • HAL Id : tel-00145223, version 2

Citation

Matthieu Caudron. Etude expérimentale et numérique de l'interaction sol-structure lors de l'occurence d'un fontis. Sciences de l'ingénieur [physics]. INSA de Lyon, 2007. Français. ⟨tel-00145223v2⟩

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