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The paper considers ways of identifring contaminated land and the problems that may arise when such areas are used for building. B.O. Corbett
Where building takes place on sites covered by substantial depths of waste material, geotechnical problems may arise and are likely to be associated with long-term settlement of the fill. The loadcarrying properties of the different types of fill that form such waste deposits vary greatly and thorough investigation is needed, preferably including a programme of field tests. Where the loadcarrying characteristics of a waste fill are found to be poor, the use of an appropriate ground improvement technique, prior to construction on the site, may form an economic solution to foundation problems. J.A. Charles and Professor J.B. Burland
Our Christmas test We wonder how many readers were puzzled with the problem set in this column last month. As we said at the time, the problem came from Martin Ashmead, and we now publish his letter: While checking steelwork calculations a few weeks ago, I came across a solution to a bracing bay configuration that amazed me. The framework was determined by the need for a door to be installed in a traditionally braced bay, i.e. diagonal bracing node point being raised from the foot of the column to a point above the door opening. Verulam