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Estimation of Uplift Capacity and Installation Power of Helical Piles in Sand for Offshore Structures
| 题名： | Estimation of Uplift Capacity and Installation Power of Helical Piles in Sand for Offshore Structures |
| 其他题名： | AB Chance.2010.Guide to model specification CHANCE civil construction:Helical piles for structural support.Bulletin 01-0303.Shelton,CT:Hubbell. |
| 正文语种： | 英文 |
| 作者： | Giovanni Spagnoli |
| 关键词： | Helical piles;Sand;Installation power;Uplift capacity;Wing ratio |
| 摘要： | In the offshore field, helical piles are being considered as a novel offshore pile system because of their flexibility regarding ease of installation and the large uplift capacity they can generate. This paper analyzes 120 cases in sand for different friction angle values, from 30 to 45°, considering five uplift forces, i.e., 5 to 25 MN, and three different wing ratio values (i.e., helix-to-shaft ratio). By using two different uplift capacity equations, the resulting embedment depths, depending on soil conditions and uplift axial force, are obtained. Torque was assessed with a model considering the relationship with the uplift capacity for deep helical piles in sand. Installation power was also initially assessed taking into account the torque and the crowd force. Calculations show that torque increases with the increasing helix diameter for the same geotechnical properties of the sand. Also, during installation, induced shear stress in the pile may be too high if the standard yield strength of steel is assumed. |
| 出版年： | 2018 |
| 论文唯一标识： | P-108Y2018V144N06007 |
| 英文栏目名称： | TECHNICAL PAPERS |
| doi： | 10.1061/(ASCE)WW.1943-5460.0000471 |
| 期刊名称： | Journal of Waterway, Port, Coastal, and Ocean Engineering |
| 拼音刊名(出版物代码)： | P-108 |
| 卷： | 144 |
| 期： | 06 |
| 页码： | 85-95 |
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