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Geological Society, London, Engineering Geology Special Publications
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Geological Society, London, Engineering Geology Special Publications; 1987; v. 4; p. 61-68;
DOI: 10.1144/GSL.ENG.1987.004.01.05
© 1987 Geological Society of London

Session 2: Opportunities for Development and Constraints on Development

Economic design of ground investigations for planning

P. B. Attewell

School of Engineering and Applied Science, University of Durham, South road, Durham DH1 3LE, UK

J. C. Cripps

Department of Geology, University of Sheffield, Mappin Street, Sheffield S1 3JD, UK

J. P. Woodman

School of Engineering and Applied Science, University of Durham, South road, Durham DH1 3LE, UK

Planning the development of an urban area is a complex operation in which many disparate objectives and constraints must be reconciled. An attempt is usually made to achieve particular aims at minimum cost. If geological and geotechnical factors are considered in isolation, then a particular structure will cost least to build in locations offering the most favourable ground conditions. Unfortunately, seldom is suitable geological and geotechnical information available at this early stage of development.

The paper outlines a mechanism whereby reduction in the uncertainty about the ground conditions, achieved by carrying out site investigations work, may be related, through the application of simple probability theory, to a consequent expected loss caused by construction or maintenance. Thus in planning decisions a financial optimum can be identified in which the cost implications of ground investigations, construction and maintenance can be taken into account.