Author(s): Branko Ladanyi

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Abstract: The paper presents two methods for in-situ testing of strength and creep properties of ice, together with their theoretical interpretation and typical results. The two methods which are relatively new in this area of application are the Stress-Controlled Cone Penetration Test (CPT), and the Sharp Cone Test (SCI). The first one, CPT, has been shown in the last few years to be an excellent tool for both ice quality profiling and for ice creep and strength properties determination. The test can be used for penetrating vertically through an ice sheet, or laterally into an ice wall in a trench. As the indentor has a simple cylindrical shape with a conical tip, its theoretical interpretation in terms of ice properties is found to be quite straightforward. The second method, called the Sharp Cone Test (SCf) is a special kind of borehole expansion test. The method consists in pushing a smooth, low-angle, conical indentor into a predrilled conical portion of a borehole, which ends with a smaller diameter pilot hole. The creep properties of ice are then deduced from the relationship between the applied load, the time, and the cone penetration, which is directly related to the hole expansion.

DOI:

Year: 1992