In-situ experimental study on the effect of probe size on FFP to determine the properties of submarine sediments

doi:10.3969/j.issn.1001-909X.2020.03.009

Abstract

Abstract: The Free-Fall Penetrator(FFP) is a new type of in-situ measurement equipment for seabed sediments, which is used for in-situ investigation of engineering properties of seabed sediments. Based on the self-developed FFP equipment, field tests were carried out at two stations in the Yellow Sea to analyze the influence of probe size on judging sediment properties. The results show that the probe size has different effects on the determination of penetration depth, penetration resistance and sediment type in different sediments. In fine sediments the probe size has less influence of penetration depth and the penetration resistance. When delineating geological stratification, smaller diameter probes can reflect more subtle changes in penetration resistance. There is more obvious influence of the probe size in coarse sediments. The larger size probe makes the bigger penetration resistance, and the penetration depth is reduced. Depending on the standardized depth and hardness factor, coarse sediments and fine sediments can be distinguished. The size of the probe is increased in the coarse sediment, the hardness factor is reduced, which is advantageous to refine the type of deposit.

Key words: seabed sediment, Free-Fall Penetrometer, type of sediment, penetration resistance

CLC Number:

P736.21

SHAN Hongxian, WEI Zhiming, ZHANG Minsheng, JIA Yonggang. In-situ experimental study on the effect of probe size on FFP to determine the properties of submarine sediments[J]. Journal of Marine Sciences, 2020, 38(3): 83-91.

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