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This work investigates the impact of deep coal mining induced vibrations onsurface constructions using numerical tools. An experimental study of thegeological site amplification and of its influence on mining induced vibrationshas already been published in a previous paper (Part 1: Experimental evidencefor site effects in a coal basin). Measurements have shown the existence of anamplification area in the southern part of the basin where drilling data haveshown the presence of particularly fractured and soft stratigraphic units. Thepresent study, using the Boundary Element Method (BEM) in the frequency domain,first investigates canonical geological structures in order to get generalresults for various sites. The amplification level at the surface is given as afunction of the shape of the basin and of the velocity contrast with thebedrock. Next, the particular coal basin previously studied experimentally(Driad-Lebeau et al., 2009) is modeled numerically by BEM. The amplificationphenomena characterized numerically for the induced vibrations are found to becompatible with the experimental findings: amplification level, frequencyrange, location. Finally, the whole work was necessary to fully assess thepropagation and amplification of mine induced vibrations. The numerical resultsquantifying amplification can also be used to study other coal basins orvarious types of alluvial sites.

Local amplification of deep mining induced vibrations - Part.2: Simulation of the ground motion in a coal basin