Vibratory-based INstallation: Extended data collection for Xxl monopiles (VINEX)

WHY

Monopiles are the most common foundation for offshore wind turbines in the North Sea, and we expect this trend to continue. They are relatively easy and inexpensive to produce, take up less space on ships, and are reliable. Currently, hydraulic pile driving (or hammering) is the main method for installing monopiles in the seabed.

However, hammering has major drawbacks: it generates underwater noise that can harm marine life, and the technique is unsuitable for removing piles once they reach the end of their lifespan. To address these issues, new installation technologies are being researched and tested. These alternatives aim to enable both the installation and removal of large monopiles in various ground conditions sustainably, affordably, and in a socially and environmentally acceptable way.

None of these technologies are yet ready for commercial use. Advancing them requires a deeper understanding of their performance and validation of the models. This progress will help ensure that offshore wind in the North Sea remains one of the most cost-effective options for electricity generation.

WHAT

In the SIMOX project, we aim to develop the knowledge needed for innovative installation methods. In this project, we focus on acquiring essential technical and environmental insights to have one or more certified, next-generation installation technologies ready within five years. A literature review in SIMOX revealed that knowledge gaps in the industry require more extensive research and testing than initially planned. By combining the SIMOX efforts with the VINEX project, we can expand data collection and significantly improve model quality at a relatively low cost. Higher-quality models will speed up certification and, thus, the commercial use of these technologies.

EXPECTED RESULTS

This project will build on the SIMOX project to advance the design and installation of monopiles using vibratory-based methods. It aims to improve understanding of monopile installation impacts, especially with new technologies, through additional onshore testing. Existing on site equipment will be used to install additional piles and gather further data on driveability, lateral behaviour, and noise.

Expected results include:

• Driveability data for nine more piles, some with thicker walls
• Lateral bearing capacity data for three additional pile pairs, including thicker-walled piles
• Noise and soil vibration data for all installation types
• Decommissioning data for nine piles

Data analysis will focus on:

• Pile driveability
• Lateral bearing capacity
• Noise and vibration emissions
• Wall thickness impacts
• Decommissioning using new methods.