The in situ measurement of seafloor physical properties such as pore pressure, shear strength or compressibility poses a challenge to engineers, in particular in the marine realm. We present the design and first use of a marine, deep-water free-fall instrument for cone penetration testing (CPT). The probe can be operated in up to 4000 m water depth to measure cone resistance, sleeve friction, deceleration, temperature and tilt as well as pore pressure in u1 and u3 position. In this paper we discuss the advantages and disadvantages of the current prototype design, and dwell on the differences between quasi-static versus dynamic cone penetration testing.
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Stegmann, S., Kopf, A. (2007). Marine Deep-Water Free-Fall Cpt Measurements For Landslide Characterisation Off Crete, Greece (Eastern Mediterranean Sea) Part 1: A New 4000M Cone Penetrometer. In: Lykousis, V., Sakellariou, D., Locat, J. (eds) Submarine Mass Movements and Their Consequences. Advances in Natural and Technological Hazards Research, vol 27. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-6512-5_18
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