Induced seismicity in a salt mine environment evaluated by a coupled continuum-discrete modelling

Abstract : With the objective to better understand the induced microseismicity in a salt mine environment due to an underground solution mining, an in situ experiment is undertaken by GISOS in the Lorraine salt basin. The overburden overlying the salt cavity is characterized by the presence of two competent layers where most microseismic events are expected. This paper presents a coupled continuum-discrete modelling to simulate the mechanics of fracture initiation and propagation in the rock mass overlying the cavity: discrete approach for the competent layers and continuum approach for marls, salt and other rocks and soils. For the competent layers, numerous calibrations of the model microparameters based on the laboratory results are firstly performed. The first coupled modelling results suggest that the mechanism of fracturing in the competent layers is predominantly tensile as it could be expected. The results also show that the microseismic events associated to the progressive damage in the competent layers through microcraks development can be modelled. This opens interesting perspectives to assess the feasibility of seismic monitoring of underground cavities by comparing, in the future, the numerical modelling results with the recorded seismicity of the study area.
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  • HAL Id : ineris-00972514, version 1
  • INERIS : PU-2005-238

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Diego Mercerat, Mountaka Souley, Lynda Driad-Lebeau, Pascal Bernard. Induced seismicity in a salt mine environment evaluated by a coupled continuum-discrete modelling. Symposium Post mining 2005, Nov 2005, Nancy, France. pp.NC. ⟨ineris-00972514⟩

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