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Stadium survey


Fugro Bel has just finished a geophysical survey of boreholes at the site of the Manchester Stadium being built for the 2002 Commonwealth Games. Working for site investigation contractor Norwest Holst Soil Engineering, Fugro surveyed 23 boreholes to a maximum depth of 80m over three phases. The site is underlain by interbedded upper carboniferous silty mudstones, coal, siltstones and sandstones of varying thickness. The rock is typically fractured, making insitu quality assessment difficult, so high-definition acoustic borehole imaging techniques were used to provide shallow dip information from small diameter boreholes and resolve complicated patterns of closely spaced fractures. Automated feature picking could not cope with the complexity of the intersecting fractures so a geologist was needed for interpretation. Gamma, density, sonic and neutron logs obtained further detail. Environmental logs and temperature and resistivity/ conductivity logging provided hydrogeological details.

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