Samenvatting
The first small-strain integrity tests applied to drilled shaftswere made in france in 1964. Early tests were limited by the size, slowness, and cost of the available electronics, as well as the variety of geotechnical conditions and construction methods encountered. The various methods and their progress during the past 25 years are reviewed, and their strengths and weaknesses are outlined as an aid to selecting the most appropriate technique for a given set of circumstances. In addition, ideas are proposed for test development andintegration in the u.S. Market for the near future. This paper appears in transportation research record no. 1331, Integrity testing of foundations 1991