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Technical Paper: Bang on target

Asger Eriksen and Waleed Al-Nuaimy describe a statistical basis for assessing the risk of unexploded bombs during site investigations and piling. This paper was first published in GE’s May 2006 issue.

The threat of buried unexploded bombs (UXB) to land developments in some areas of the UK has been well publicised. A formalised statistical approach to assessing this risk for land owners, developers or consultants is, however, lacking.

This note introduces a statistically rigorous method for quantifying these risks so the potential impact of a few boreholes on a site or a dense grid of clustered piles can be accurately quantified.

Large areas of Europe were bombed heavily during the Second World War, and bombs which failed to explode can still pose a danger to construction work. But there is no regulation, guidance or industry consensus on good practice to assist professionals who need to assess the degree of risk of such sites.

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