Seacalf:A submersible cone‐penetrometer rig

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Abstract
In the years 1972–1973, an underwater rig was developed in Holland to perform quasi‐static cone‐penetrometer tests from seabed level. The main features are: (1) The depth of penetration is not limited by the length of the testrods, but by the 20‐ton thrust capacity; and (2) with suitable vessels, the rig can be operated in waves of swell of 2 to 4 m. As of mid‐19 74, about 500 cone‐penetrometer tests were performed in the northern North Sea. Three selected tests illustrate results in a soft clay; in a confused layer of clay, gravel, and sand overlying a homogeneous hard clay; and in a layer of sand overlying hard clay.

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