Report - 3D Geotechnical Model - Arcadis

Report - 3D Geotechnical Model - Arcadis

This report presents the Pilot of a 3D Geotechnical Ground Model which was developed based on the extensive data set collected in the geophysical and geotechnical campaigns in the area of the Hollandse Kust (noord) (HKN) Wind Farm Zone (WFZ). The reports and data referred to have been published at

https://offshorewind.rvo.nl/

This report strives for the development of a 3D model following the layering approach for the HKN-WFZ. This shall enable developers and end-users to determine the design-relevant layers at any potential wind turbine location for the preliminary design. The 3D model and the application of the characteristic geotechnical parameters, delivered in the report, can serve as a solid basis for every foundation design in the HKN-WFZ and can contribute to the park layout planning. Furthermore, this 3D model may help to reduce the number of additional site investigations in the post-tender phase.

The ground conditions at HKN are characterized by inhomogeneous soil conditions, represented by several layers which are not present across the whole site and a dominant layer of sands, originating from different geological ages and deposit in different densities and with different fine and coarse content. These differences were mostly not traceable with geophysical measurements, which made the allocation of subdivided layers ambitious. The interpretation of the soil layer between the geotechnical investigation points (CPTs and Boreholes) have been made by a thorough geological and geotechnical interpretation but remains an approximation of the real in situ conditions.

Regarding the Geological Model, RVO.nl recommends the approved and certified geological ground model delivered by Fugro as official reference for further use: https://offshorewind.rvo.nl/soilnh. 

The aim to develop a 3D geotechnical ground model which should also subdivide the most relevant unit D required a more detailed interpretation of this unit. This geological interpretation in the present report is only serving to define the 3D boundaries in areas where the geotechnical and the geophysical boundaries were not precise or had to be interpolated.

The 3D model and the characteristic parameters have to be applied with cautiousness and engineering judgement due to above mentioned limitations. Considering this, these values provide a detailed insight to the geological and geotechnical conditions at HKN-WFZ.

RVO.nl encourages all users of this Pilot of the 3D geotechnical model to share their view of the model and their experiences with the application. For RVO.nl it is of utmost importance to understand the end-users needs and concerns to be able to address them in the upcoming WFZ pre-developments. Your feedback will enable RVO.nl to set the right priorities in the soil investigations and the evaluations and reporting of the results. 

RVO.nl has following questions:

  1. How will you apply the 3D ground model in your tender preparation?
  2. Which aspects of the 3D ground model do you consider of added value for your tender preparation?
  3. Which further development of such models would you propose or expect from RVO.nl to further improve your project preparation and to reduce your risk perception in relation to the foundation and installation design?
  4. Would you require additional digital data or another file format to maximize the benefit from such 3D Models provided by RVO.nl?
  5. In which phases of your design will you make use of the provided 3D ground model and who will be working with the data (internal experts, external consultants/experts)?

Please submit your feedback anytime at: woz@rvo.nl

Disclaimer

The creative commons license terms 4.0 CC BY apply to this material. Please take notice of the general terms “Creative Commons Attribution 4.0 International public License” before starting to use the license. These terms can be accessed by clicking on this link https://creativecommons.org/licenses/

This work was carried out by Arcadis Germany GmbH, commissioned by RVO.nl, an agency of the Ministry of Economic Affairs and Climate Policy. Whilst a great deal of care has been taken in compiling the contents of this work, RVO.nl can not be held liable for any damages resulting from any inaccuracies and/or outdated information.

The information in this document is valid at the time of publishing (see month/year). Updates will be published on the website https://offshorewind.rvo.nl/ at the relevant sitemap (Hollandse Kust (noord)), General Information, submap Revision Log and Q & A. In the Revision Log is indicated which versions are the latest and what the changes are in relation to previous versions. The documents can be found at the relevant sites, indicated in the List of all reports and deliverables.