Interpretation problems of water contents and densities measured by nuclear devices in field monitoring programmes

摘要

This paper presents the results of monitoring programs of volumetric water contents and densities in the surficial clay soils of Montreal's Island, by means of density/moisture depth gages. It presents interpretation problems which were caused by the existence of void spaces between the access tubes and the surrounding soils. The paper finally reports soil-water characteristic curves for the soils encountered on the sites and indicates that, due to the compressive nature of the soils structure, mathematical modelling of soil water movement becomes a difficult task.