Tunnelling is a high risk business. Success depends crucially on the nature of the ground through which the tunnel is being driven. The cost of a thorough site investigation is usually only a small fraction of the cost of the construction work but this crucial phase of a project is often given too low a priority. This text provides a review of tunnelling contracts, particularly those for sewerage and drainage tunnels. It reviews site investigation methods, contract preparation and tender evaluation, tunnel costruction, claims and records, and the post-construction phase. Examples of good and bad practice of site investigation and other aspects of tunnelling are given, and the text is supported by over 500 references. Supplementary information in the second part of the book expands on particular aspects such as ground vibration and noise. Among other topics covered are quality assurance, rock properties and testing, pollution, permeability and dewatering.

A wide ranging and up-to-date review of experience of tunnelling contracts, particularly those for sewerage and drainage tunnels. The review is based on the 6th edition of the ICE Conditions of Contract, but it takes note of new forms of contract which are leading towards less adversarial contractual relations.^

'Engineering geology' is one of those terms that invite definition. The American Geological Institute, for example, has expanded the term to mean 'the application of the geological sciences to engineering practice for the purpose of assuring that the geological factors affecting the location, design, construction, operation and mainten ance of engineering works are recognized and adequately provided for'. It has also been defined by W. R. Judd in the McGraw-Hill Encyclopaedia of Science and Technology as 'the application of education and experience in geology and other geosciences to solve geological problems posed by civil engineering structures'. Judd goes on to specify those branches of the geological or geo-sciences as surface (or surficial) geology, structural/fabric geology, geohydro logy, geophysics, soil and rock mechanics. Soil mechanics is firmly included as a geological science in spite of the perhaps rather unfortunate trends over the years (now happily being reversed) towards purely mechanistic analyses which may well provide acceptable solutions for only the simplest geology. Many subjects evolve through their subject areas from an interdisciplinary background and it is just such instances that pose the greatest difficulties of definition. Since the form of educational development experienced by the practitioners of the subject ulti mately bears quite strongly upon the corporate concept of the term 'engineering geology', it is useful briefly to consider that educational background."