Growth through Research, development & demonstration in Offshore Wind

Project:

Monopile Improved Design through Advanced cyclic Soil modelling in clay (MIDASclay)

Optimal design of monopiles by accounting for the effects of repetitive loading in offshore environments and clay soil conditions.

WHY

Offshore wind turbines are evolving, becoming larger and more powerful. Over the next decade, they will face more challenging marine environments and deeper waters, posing significant design and installation challenges for support structures.

Currently, about 80% of European offshore wind turbines rely on monopiles. While expected to remain a primary foundation solution, the design process involves wide safety margins, leading to excessive steel use. Since support structures comprise around 20% of wind farm investments, optimising monopile design could yield substantial cost reductions.

The MIDAS project focused on the cyclic behaviour of lateral-loaded monopiles in dense sandy soils, which is crucial for North Sea conditions. Building on this, MIDASclay aims to expand the framework and incorporate cohesive soils and soil mixtures. This results in a versatile model for simulating cyclic lateral monopile-soil interaction in diverse marine soil environments.

WHAT

MIDASclay's primary goal is to enhance understanding of monopile-soil interaction under cyclic loading in cohesive soils, developing an engineering model for fast, reliable monopile design. This will be achieved via a blend of physical and numerical modelling experimental studies.

At Deltares physical modelling laboratory, cyclic soil testing and small-scale centrifuge tests will explore cyclic monopile-clay interaction, providing novel data for numerical modelling and contributing to optimised monopile design. TU Delft researchers, supported by Deltares and the Norwegian Geotechnical Institute, will use numerical modelling to design and interpret the experiments, while PhD and Postdoc researchers at TU Delft will lead the development of a new cyclic soil reaction method for monopiles in diverse marine soil conditions.

Industry partners will test findings against relevant design cases and field data, ensuring the robustness of the proposed method. MIDASclay's methods will be tested beyond their primary scope, predicting lateral stability during the sensitive monopile installation stage, enhancing confidence in procedures and reducing costs while improving safety.

EXPECTED RESULTS

MIDASclay will yield:

By actively engaging in project development, testing, and implementation, MIDASclay partners gain a competitive edge in the offshore wind industry, leading to increased success in tenders, job creation, and overall cost reduction for global offshore wind energy. The project's benefits extend beyond partners, significantly impacting the entire offshore wind sector upon public dissemination.

Contact Details

TU Delft

Evangelos Kementzetzidis
+31 15 278 6882

Technology Readiness Level

Maturity level: 5.
        6,
        7,
        5 6 7

Project duration

Theme

Foundation
Detailed analysis of Monopile-Soil system magnify Detailed analysis of Monopile-Soil system

Detailed analysis of Monopile-Soil system

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Detailed analysis of Monopile-Soil system

MIDASclay cyclic analysis of monopiles magnify MIDASclay cyclic analysis of monopiles

MIDASclay cyclic analysis of monopiles

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MIDASclay cyclic analysis of monopiles

Other information

Gentle Driving of Piles at a Sandy Site Combining Axial and Torsional Vibrations: Quantifying the Influence of Pile Installation Method on Lateral Behavior (Journal of Geotechnical and Geoenvironmental Engineering, 2023)

Gentle Driving of Piles (GDP) at a sandy site combining axial and torsional vibrations: Part II - cyclic/dynamic lateral loading tests (Elsevier, 2023)

A memory-enhanced p-y model for piles in sand accounting for cyclic ratcheting and gapping effects (Elsevier, 2022)

No AccessFrom cyclic sand ratcheting to tilt accumulation of offshore monopiles: 3D FE modelling using SANISAND-MS (Géotechnique, 2022)

Frequency effects in the dynamic lateral stiffness of monopiles in sand: insight from field tests and 3D FE modelling (Géotechnique, 2021)

Geotechnical aspects of offshore wind turbine dynamics from 3D non-linear soil-structure simulations (Elsevier, 2019)

This project is supported with a subsidy by the Dutch Ministry of Economic Affairs and Climate Policy.

Partners

Associate project partner