Concept design and preliminary testing towards a new ROBOCONE t-z module for in-situ cyclic soil characterization

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To meet future net-zero energy targets, the acceleration of offshore wind farm deployment is essential. A critical phase in this process is the pre-construction stage, particularly the site investigation needed to design the foundations of wind turbines. To expedite this stage and reduce reliance on time-consuming laboratory tests, a new robotic site investigation tool called the ROBOCONE is being developed. This tool aims to facilitate in-situ testing, potentially speeding up the site investigation process. The ROBOCONE comprises three distinct modules, one of which is the t-z vertical module. This module is specifically designed to directly measure the t-z reaction curve of the soil by moving vertically, thus mimicking the kinematic mechanism experienced by an axially loaded pile element. By providing direct in-situ characterization of the t-z soil reaction curves, the t-z vertical module offers a more efficient and accurate method for assessing soil-pile interaction under axial loading on the pile. This paper presents the initial design developments and features of the ROBOCONE t-z module, which could be potentially integrated behind a standard Cone Penetrometer. Key aspects discussed include the device's specifications, operational capabilities, and requirements for future improvement and upgrade towards a prototype that can be deployed in the field.

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

1 - Site investigation strategies, geohazards and integrated studies