Deep underground exploitation: signature of a collaboration agreement with the Swedish company Boliden

sous sol profond : Boliden

Ineris and Boliden Swedish company, which specializes in mining, have renewed their partnership research agreement for a period of 3 years. This agreement aims to improve geotechnical and geological risks assessment and management for deep underground exploitation.

The Institute and Boliden are thus continuing their collaboration, which has started in 2015, with the aim to study and better understand the response of the rock mass induced by the underground industrial exploitation , and ultimately to develop decision-making help tools to determine optimal security strategies.
The studied mining area is located north of Stockholm, 1,200 m deep, in one of the deposits of Garpenberg polymetallic mine.
A multidisciplinary approach has been implemented: it integrates visual observation of the deep underground environment, predictive and comparative 3D geomechanical digital modeling, high-resolution microseismic and geotechnical monitoring, as well as production data follow-up.
The objective is to better understand the conditions and dynamics of small-and large-scale rock deformation and fracturing as well as the aseismic mechanisms and their impacts, in response to exploitation. Specific in situ experiments are planned, the analysis of microseismic data will include the application of template matching * methods, taking advantage of the e.cenaris monitoring infrastructure.

A doctoral project has also started in March 2020, in collaboration with the GeoRessources laboratory (University of Lorraine) and the Institut de Physique du Globe de Paris, and with the support of the Grand-Est region. It follows Francesca De Santis' doctoral thesis, defended in February 2019.

*Template matching : signal analysis method based on the correlation of time sections with a catalog of events previously established.

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