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* Department of Transport, Midland Road Construction Unit (Derbyshire Sub-Unit), , PO Box No 6, County Offices, Matlock, Derbyshire DE4 3AG
Engineering Geology Limited, , Teknis House, Meadrow, Godalming, Surrey
The 7.1 km dual two-lane Unstone-Dronfield By-Pass, Derbyshire, first opened to traffic in 1975, incorporates a 30 m deep rock cut at Monk Wood, excavated in strata of Lower Coal Measures age. Cuttings in similar geological settings elsewhere had resulted in mass slide failures and the measures adopted at Monk Wood to avoid a similar problem are described. The site was complicated by the presence of extensive old workings for coal and ironstone; their treatment is discussed.
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