A Case Study in Tensiometer interpretation: Centrifuge Modelling of Unsaturated Slope Behaviour

Progress made over the past decade on the direct measurement of suction has clarified the design requirements of high capacity tensiometers and the procedures surrounding the rather difficult process of tensiometer saturation. However, many challenges still exist relating to the direct measurement of matric suction; particularly in the interpretation of suction data. In this paper, we present a case study of tensiometer interpretation derived from apparent confusing observations of matric suction which had been observed in a centrifuge model test of an unsaturated slope. Using additional observations of tensiometer behaviour in the laboratory, the apparent confusing nature of this data is explained, and lessons are drawn regarding good practice in both model tests and field instrumentation.