Application of borehole logging, core imaging and tomography to geotechnical exploration

Lithological, structural and rock mechanical information has been derived from geophysical methods. Classification and characterisation of rock structures have been defined by a combined interpretation of core images and acoustic images of borehole wall. Geophysical well logs also provide an efficient tool for detemination of lithology by a combined evaluation of the log responses. Seismic velocities and reflectivity measured in (full wave sonic) and between (seismic tomography) boreholes are very important for the derivation of rock strength and the determination of weakness zones in solid formations. Several examples show the benefits of the combined use of geophysical methods in geotechnical studies. (C) 2001 Elsevier Science Ltd. All rights reserved.