A large scale continuum-discrete numerical modelling : application to overburden damage of a salt cavern

Abstract : With the objective to better understand the evolution of overburden damage on top of an underground solution mining, an in-situ experiment is undertaken above a salt cavity in the Lorraine region (NE of France). The overburden overlying the salt cavity is characterized by a competent layer where most brittle damage, with the associated microseismicity, is expected. This work presents a coupled continuum-discrete modelling approach to simulate the mechanics of fracture initiation and propagation in the rock mass, a continuum approach for the marls and salt layers, and a discrete micromechanical approach for the competent layer. A methodology of a large scale coupled continuum-discrete modelling is proposed and applied to the site of Cerville-Buissoncourt. The numerical verification of the hybrid approach response is achieved by comparing the results with those from the fully continuum model at the site scale when the competent layers behave elastically. The first results of a large scale modelling based on the hybrid approach suggest that the fracture mechanisms in the competent layers are predominantly tensile. Finally, these explicit microcracking simulations open interesting perspectives for comparison with the observed microseismicity of the study area (transient pressure experiment or future final collapse).
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  • HAL Id : ineris-00973286, version 1
  • INERIS : EN-2008-032

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Mountaka Souley, Diego Mercerat, Lynda Driad-Lebeau, Pascal Bernard. A large scale continuum-discrete numerical modelling : application to overburden damage of a salt cavern. Symposium Post-Mining 2008, Feb 2008, Nancy, France. pp.NC. ⟨ineris-00973286⟩

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