On the development of a novel marine seismic cone penetration testing (SCPT) system

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Following the conclusions of the Pile Soil Analysis (PISA) Project, increased emphasis is being placed on the acquisition of in-situ seismic (shear wave) velocity data, needed for evaluation of small strain modulus (Gmax). This requires corroboration against laboratory-based measurements, to develop a reliable set of detailed foundation design parameters. There is a growing need to ensure that offshore testing of seafloor soils leads to accurate and reliable data with regard to measurement of shear wave velocity (Vs); a critical input parameter in the geotechnical design of wind turbines. Discussion among industry, clients, designers and contractors is needed on ways to improve seismic cone penetration test (SCPT) set-up, data acquisition and interpretation methodologies, to develop increased confidence in the Vs and Gmax results. The discussion provided within this paper follows on from a previous paper, by presenting new observations and findings on; design, testing and means of utilisation of a dual-array non-drilling mode seismic cone penetration test (SCPT) device and seafloor seismic source. Within this context, the paper describes; engineering considerations and optimisation of this novel technology, for deployment from a new generation of robotic vessel; recommended offshore equipment set-up and operation; commentary on seismic data quality, including challenges encountered during seismic data acquisition, processing and interpretation. The paper also presents a result-based evaluation of SCPT and CPT data collected at a reference location in the southern North Sea. Finally, a methodology is reviewed and extended, for detection of soil cementation and microstructure, using a combination of normalised shear wave moduli and cone penetration test results.

 

5th International Symposium on Frontiers in Offshore Geotechnics (ISFOG2025)

2 - Site characterization, in-situ and laboratory testing, measurement