A method for identification of an effective Winkler foundation for large diameter offshore wind turbine support structures based on in-situ measured small-strain soil response and 3D modelling

被引:26
作者
Versteijlen, W. G. [1 ,2 ]
Metrikine, A. V. [2 ]
van Dalen, K. N. [2 ]
机构
[1] Siemens Wind Power, Beatrixlaan 800, NL-2595 BN The Hague, Netherlands
[2] Delft Univ Technol, Fac Civil Engn & Geosci, Stevinweg 1, NL-2628 CN Delft, Netherlands
关键词
Offshore wind foundations; Fundamental natural frequency; Small-strain soil stiffness; In-situ seismic measurement; 3D to 1D modelling translation; DYNAMIC-RESPONSE;
D O I
10.1016/j.engstruct.2016.06.007
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
A procedure is presented for the derivation of an effective small-strain soil stiffness governing the soil structure interaction of large-diameter monopiles. As a first step, geophysical measurements are used to estimate the depth-dependent shear modulus G of the soil stratum. The second step is to use this modulus and an estimated Poisson's ratio and density in a 3D model, which captures the deformation of both the monopile and the soil. As a final step, a new method is proposed to use the computed 3D response for identification of a depth dependent stiffness of an effective Winkler foundation. This stiffness can be used in a 1D model, which is more fit for design purposes. The presented procedure is deemed more appropriate than the often used "p-y curve" method, which was once calibrated for slender flexible piles and for which the input is based on the large-strain cone penetration test. The three steps are demonstrated for a particular design location. It is also shown that the displacements of the 3D model are smaller and the resulting fundamental natural frequency is higher than calculated with the p-y method. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:221 / 236
页数:16
相关论文
共 34 条
[11]   Laterally loaded monopile design for offshore wind farms [J].
Doherty, Paul ;
Gavin, Kenneth .
PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-ENERGY, 2012, 165 (01) :7-17
[12]   ELASTIC PROPERTIES OF MARINE SEDIMENTS [J].
HAMILTON, EL .
JOURNAL OF GEOPHYSICAL RESEARCH, 1971, 76 (02) :579-+
[13]   VP-VS AND POISSON RATIOS IN MARINE-SEDIMENTS AND ROCKS [J].
HAMILTON, EL .
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 1979, 66 (04) :1093-1101
[14]  
KALLEHAVE D, 2012, Offshore Site Investigation and Geotechnical: Integrated Technologies -Present and Future, P465
[15]   Optimization of monopiles for offshore wind turbines [J].
Kallehave, Dan ;
Byrne, Byron W. ;
Thilsted, Christian LeBlanc ;
Mikkelsen, Kristian Kousgaard .
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 2015, 373 (2035)
[16]  
Kokoshu T., 1980, SOILS FOUND, V20, P45, DOI [DOI 10.3208/SANDF1972.20.245, 10.3208/sandf1972.20.2_45, DOI 10.3208/SANDF1972.20.2_45]
[17]  
Lesny K, P GEOCONGRESS ATL GE
[18]  
Leth C, NORD GEOT M, P491
[19]   Response of reinforced concrete piles including soil-pile interaction effects [J].
Limkatanyu, Suchart ;
Kuntiyawichai, Kittisak ;
Spacone, Enrico .
ENGINEERING STRUCTURES, 2009, 31 (09) :1976-1986
[20]  
Matlock H., 1970, OFFSHORE TECHNOLOGY, P77