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MASW Characterization of Ground Subsidence Induced by an Outburst of Water From a Sump Gallery at St-Vaast, Belgium
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Near Surface 2011 - 17th EAGE European Meeting of Environmental and Engineering Geophysics, Sep 2011, cp-253-00024
- ISBN: 978-90-73834-15-6
Abstract
In February 2009, several damages were recorded on 9 houses and a road at St-Vaast (Belgium) a few days after a sudden outburst of water coming from a former coal mining sump gallery. To identify the origin of these damages and understand the mechanism of the ground subsidence, geological, hydrogeological geotechnical and geophysical investigations were conducted. Five MASW (Multichannel Analysis of Surface Waves) profiles were carried out inside and around the impacted zone to delimit its extent. S-velocity anomalies were pointed out near the surface and at depth just beneath the centre of the impacted area.