堆
圆锥贯入试验
岩土工程
基础(证据)
结构工程
工程类
海上风力发电
张力(地质)
扭矩
海底管道
流离失所(心理学)
仪表(计算机编程)
压缩(物理)
材料科学
机械工程
涡轮机
计算机科学
物理
历史
复合材料
操作系统
考古
热力学
心理治疗师
心理学
作者
Eduardo Bittar,Barry Lehane,Anthony Blake,D. J. Richards,David White,S. Mahdavi,Benjamin Cerfontaine
标识
DOI:10.1139/cgj-2022-0209
摘要
Helical piles are used extensively for low and medium rise developments and are a popular foundation solution in cases where resistance to significant uplift loads is required. The ability to re-use helical piles and recent interest in their use as foundations in offshore wind and solar energy applications has renewed interest in improving existing design methods. This paper presents the results from field investigations in medium dense and dense sand that examine effects on the axial tension and compression capacity of varying the helix pitch, shaft diameter, advancement ratio and shaft tip geometry. The results from the 20 pile tests conducted (many of which included instrumentation) indicate low sensitivity to a range of the investigated parameters and a strong correlation of the capacity to the cone penetration test resistance. A design method based on these findings is proposed for typical helical pile geometries and is shown to provide predictions that are generally within 10 to 15% of the axial capacities reported for 30 other well documented pile tests reported in the literature. The method, referred to as UWASP-22, incorporates a simple means of estimating the load-displacement response of a helical pile as well as a formulation enabling prediction of the installation torque which is a common quality control measure for helical piles.
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