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Seismic and geotechnical investigations following a rockburst in a complex French mining district

Abstract : This paper presents the results of seismic and geotechnical studies carried out after a fatal accident that occurred during mining of the Frieda5 coal seam at Merlebach mine of HBL (Houilleres du Bassin Lorrain, East France). On June 21, 2001, a violent rockburst (local magnitude of 3.6) affected the Frieda5 seam at depth of approximately 1250 m. The zone of the accident is located in the main gate 200 m ahead of the longwall face. Subsequently, an investigation was carried out to determine the causes of the accident and to understand the induced phenomenon. The program included an analysis of a comprehensive set of seismic data and the collection of in-situ stress measurements. The objectives were twofold : to provide input data for the back analysis of the rockburst and to identify other potential high-risk zones in the next panels to be mined. The joint analysis of the seismic, geological and geotechnical investigations suggests that the rockburst is largely due to a specific geological phenomenon, a sandstone channel in the floor of the coal seam characterized by high horizontal stresses.
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Submitted on : Friday, March 21, 2014 - 2:06:36 PM
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Lynda Driad-Lebeau, Franz Lahaie, Marwan Al Heib, Jean-Pierre Josien, Pascal Bigarre, et al.. Seismic and geotechnical investigations following a rockburst in a complex French mining district. International Journal of Coal Geology, Elsevier, 2005, 64 (1-2), pp.66-78. ⟨10.1016/j.coal.2005.03.017⟩. ⟨ineris-00962960⟩

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