Evaluation de l'endommagement dans le recouvrement d'une cavité saline par une approche numérique couplée continue-discrète

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 over a salt cavity in the Lorraine region. The overburden overlying the salt cavity is characterized by a competent layer where most fragile 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 FLAC for the marls and salt layers, and a discrete approach PFC for the competent layer. Numerous calibration experiments of the discrete model microproperties are firstly performed to reproduce the mechanical response of the competent layer samples. The numerical validation of the coupled approach is carried out by comparing the results with those from the fully continuum approach at the site scale. First modelling results suggest that the mechanisms of fracture in the competent layers is predominantly tensil. Moreover, microcrack simulation opens interesting perspectives for comparison with the observed microseismicity of the study area.
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  • HAL Id : ineris-00973276, version 1
  • INERIS : EN-2007-342

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Diego Mercerat. Evaluation de l'endommagement dans le recouvrement d'une cavité saline par une approche numérique couplée continue-discrète. 25. Rencontres universitaires de génie civil, May 2007, Bordeaux, France. pp.8. ⟨ineris-00973276⟩

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