Abstract
Free-falling penetrometers (FFPs) are rapid and cost-effective tools that can be used in seabed strength characterisation. To date, FFPs have not been widely used, because of the lack of reliable interpretation methods and well-controlled experimental studies. This paper presents an interpretation method for a thin-shafted FFP based on the results of extensive laboratory model FFP tests and triaxial compression tests on normally consolidated kaolin. In the model tests, a thin-shafted FFP with circular plate tip has been dropped into claybeds with a range of undrained shear strengths at various impact velocities. The FFP has also been pushed into the claybeds at slow constant-penetration rate to provide a comparison between the static and dynamic penetration resistances. Triaxial compression tests have been conducted to provide the critical state parameters, and to study the rate-dependence behaviour of the kaolin. Using these test results, an empirical model is proposed to estimate the undrained shear strength from a thin-shafted FFP test in clay. The applicability of the proposed model is compared with existing methods and numerical solutions.
Subject
Earth and Planetary Sciences (miscellaneous),Geotechnical Engineering and Engineering Geology
Cited by
16 articles.
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