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Cologne collapse: don’t rush to blame ground anchors

I read with interest the possible explanations given by geotechnical engineers regarding the recent collapse in Cologne (News last week). While I have no doubt that the failure of one or more ground anchors may have unzipped the diaphragm wall, I think it is a little previous to blame the anchors themselves. The diaphragm wall would have been constructed in the undewatered state, anchoring would have been installed as the excavation deepened, this ...

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