Abstract
ABSTRACT The development of three separate algorithms for predicting geotechnical strength parameters from geophysical logs in sedimentary rock formations is outlined. The geotechnical and geophysical data were obtained from drillholes which penetrated both coal and non-coal deposits to depths up to 80 m at two operating surface coal mines in western Canada. The strength parameters for the different lithologies were determined from back-pressure saturated, consolidated-undrained triaxial tests with pore pressure measurement. The digitized suite of geophysical logs included gamma, caliper, density, resistivity, sonic and neutron logs. The algorithms consist of exponential expressions relating the effective across-bedding friction angle, φ to various combinations of geophysical logs.
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