Abstract
Abstract The Roads and Traffic Authority of NSW (RTA) (Australia) has developed a high standard of practice in collecting, interpreting and documenting geotechnical information for road construction contracts. In particular high standards have been developed for seismic refraction information and its integration into overall geotechnical information in relation to detailed design, documentation for contract tendering, road construction and its possible use in evaluating contract claims. It is important to treat the seismic information as an independent source of data for an overall geological model that is developed for the site. This model is derived from sources such as geological mapping and surface observations, drilling, pitting and geophysics. Use of this approach has been critical in achieving substantial reductions is cost overruns attributable to geotechnical conditions. The simplistic approach of comparing bulk property information from geophysics with the specific point information from drilling or test pits, and ascribing differences to erroneous geophysical interpretation, or adjusting the geophysics to agree with the drilling can lead to errors in the geological model. This in turn can lead to costly errors in tendering and in construction planning and often to protracted contractual claims.
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