Physical modelling to demonstrate the feasibility of screw piles for offshore jacket-supported wind energy structures

被引：35

作者：

Davidson, Craig ^{[1
]}

Brown, Michael John ^{[1
]}

Cerfontaine, Benjamin ^{[1
]}

Al-Baghdadi, Therar ^{[2
]}

Knappett, Jonathan ^{[1
]}

Brennan, Andrew ^{[1
]}

Augarde, Charles ^{[3
]}

Coombs, William ^{[3
]}

Wang, Lei ^{[3
]}

Blake, Anthony ^{[4
]}

Richards, David ^{[4
]}

Ball, Jonathan David ^{[5
]}

机构：

[1] Univ Dundee, Sch Sci & Engn, Dundee, Scotland

[2] Municipal Karbala, Karbala, Iraq

[3] Univ Durham, Dept Engn, Durham, England

[4] Univ Southampton, Fac Engn & Environm, Southampton, Hants, England

[5] Roger Bullivant Ltd, Burton Upon Trent, England

来源：

GEOTECHNIQUE | 2022年 / 72卷 / 02期

基金：

英国工程与自然科学研究理事会; 欧盟地平线“2020”;

关键词：

offshore engineering; piles & piling; torsion; HELICAL PILES; INSTALLATION TORQUE; PERFORMANCE; CAPACITY; ANCHORS; TESTS; SAND;

D O I：

10.1680/jgeot.18.P.311

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

Screw piles potentially offer quieter installation and enhanced axial tensile capacity over straight shafted driven piles. As such, they have been suggested as a possible foundation solution for offshore jacket-supported wind turbines in deeper water. To investigate the feasibility of their use in this setting, centrifuge testing of six model screw piles of different designs was conducted to measure the installation requirements and ultimate axial capacity of the piles in very dense and medium-dense sand. The screw piles were designed to sustain loads generated by an extreme design scenario using published axial capacity and torque prediction formulae. Single-and double-helix designs, including an optimised design, intended to minimise installation requirements, with reduced geometry were installed and tested in-flight. Piles in the medium-dense sand, for example, had significant installation requirements of up to 18 center dot 4 MNm (torque) and 28 center dot 8 MN (vertical force), which were accurately predicted using correlations with cone resistance data (cone penetration test). Existing axial capacity design methods did not perform well for these large-scale screw piles, overestimating compressive and tensile capacities. Revised analytical methods for installation and axial capacity estimates are proposed here based on the centrifuge test results.

引用

页码：108 / 126

页数：19

共 71 条

[21] Effect of soil deformability on the failure mechanism of shallow plate or screw anchors in sand [J].