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Optimization of inter-helix spacing for helical piles in sand

Journal of Rock Mechanics and Geotechnical Engineering 2022年第3期14卷 936-952页

作者： Kang Shao Qian Su Junwei Liu Kaiwen Liu Zhipeng Xiong Tengfei Wang Key Laboratory of High-Speed Railway Engineering Ministry of Education School of Civil EngineeringSouthwest Jiaotong UniversityChengdu610031China School of Civil Engineering Qingdao University of TechnologyQingdao266033China Guangxi Communications Investment Group Co.Ltd Nanning530022China

The optimization of the inter-helix spacing is a key issue of the axial bearing capacity of helical *** this paper,based on the cavity expansion,an analytical approach considering the small-strain stiffness,strength,compressibility and stress level of sand around the helical pile was proposed to analyze the influence zone of the helices to determine the optimal inter-helix spacing in *** calculation results of the proposed method were verified using the centrifuge test data and finite element analysis for helical pile in Congleton HST95 *** were also compared with those using the Meyerhof pile foundation *** results show that the optimal inter-helix spacing based on Meyerhof pile foundation theory differs significantly from the *** range of the influence zone for the helices in sand calculated by the cavity expansion theory matches with the data from *** calculation results with the proposed method are consistent with the range of the optimal spacing ratio inferred in the centrifuge *** results based on the two-dimensional(2D)finite element model(FEM)are also basically consistent with the calculated analytical solution.

关键词： helical pile Sand Analytical solution Cavity expansion theory Optimal inter-helix spacing

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海上风电螺旋桩侧向承载能力分析

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哈尔滨工程大学学报（英文版） 2023年第3期22卷 565-583页

作者：丁红岩罗建华张浦阳乐丛欢 State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China

The rapid development of offshore wind power and the need to move to deeper sea areas while reducing costs per kilowatt necessitate the employment of a new jacket and helical pile *** new combination combines the advantages of both jacket structures and helical piles and provides a superior bearing capacity and installation efficiency compared to conventional pile *** account for 25%-34%of the overall cost of construction,but the use of this new foundation would be highly significant for the further development of offshore wind *** study presents numerical results for the horizontal bearing capacity when horizontal displacement is applied,focusing on the bearing capacity and characteristics of the helical pile jacket foundation as well as the differences between the bearing mechanisms and failure modes of normal pile and helical pile *** model parameters are obtained through trial calculations based on actual engineering data,and the finite element model(FEM)is validated using data from a model ***,different FEMs are established,and numerical results are compared and *** a comparison between a normal pile jacket foundation and a helical pile jacket foundation with different helical blade numbers,the differences in the bearing mechanisms and failure modes are *** failure of the normal pile jacket foundation is instantaneous and sudden,whereas that of the helical pile foundation is incremental and *** data highlight the most significant contributions and vulnerabilities of the one-pile side of the foundation and suggest that the addition of blades on the one-pile side is the most effective way of improving the foundation’s bearing *** addition,the interaction between the compression side and tension side is analyzed in relation to differing the relative magnitudes of their bearing capacities.

关键词： Offshore wind power helical pile jacket foundation helical pile Lateral loading capacity Failure mode

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