砂土中光伏支架小直径刚性桩的修正<i>p</i>–<i>y</i>曲线模型

谢小松; 苏芳眉; 李勇华

doi:10.3724/j.gyjzG23033014

砂土中光伏支架小直径刚性桩的修正p–y曲线模型

doi: 10.3724/j.gyjzG23033014

1. 上海电气电站工程公司, 上海 201199;
2. 重庆大学土木工程学院, 重庆 400045;
3. 山地城镇建设与新技术教育部重点实验室(重庆大学), 重庆 400045

基金项目:

上海电气重点攻关科研课题（SEC/(Gjs)-2021-012）；重庆市研究生科研创新项目（CYS22051）。

详细信息

作者简介:
谢小松，博士，高级工程师。电子信箱： 1209166@qq.com

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- 被引次数: 0
出版历程
- 收稿日期: 2023-03-30
- 网络出版日期: 2024-05-29

A Modified P–Y Model for Small Diameter Rigid Piles of Photovoltaic Supports in Sand

1. Shanghai Electric Power Generation Engineering Company, Shanghai 201199, China;
2. School of Civil Engineering, Chongqing University, Chongqing 400045, China;
3. Key Laboratory of New Technology for Construction of Cities in Mountain Area(Chongqing University), Ministry of Education, Chongqing 400045, China

摘要

摘要: 桩基础是地面光伏支架最常用的基础形式。地面光伏支架主要受水平荷载作用，工程中常采用美国石油学协会（API）推荐的p–y曲线法对基桩的水平承载特性进行分析。为探究API推荐的p–y曲线法在计算小直径刚性桩水平受荷变形时的适用性，依托某光伏项目，建立四种不同桩径的小直径刚性桩三维有限元数值模型，分析其水平承载特性并获得不同深度处基桩的p–y曲线，通过对比验证API推荐p–y曲线的适用性，在此基础上提出考虑桩径和深度的砂土中小直径刚性桩桩修正p–y曲线计算模型。结果表明：小直径刚性桩的水平位移与桩径成反比，桩径对桩身弯矩的影响不大。与数值模拟相比，API推荐的p–y曲线初始刚度偏大，极限土抗力偏小，不适用于小直径刚性桩的水平受荷计算。基于数值模拟结果，拟合得到了桩径、深度与初始地基刚度和极限土抗力之间的关系式，建立了地面光伏支架p–y曲线的修正模型，并结合实际工程进行验证计算，结果吻合较好。
- 光伏基桩 /
- p-y曲线法 /
- 砂土 /
- 有限元计算 /
- 小直径刚性桩
Abstract: Pile foundations are the most commonly used foundation forms of terrestrial photovoltaic supports, which mainly bear horizontal loads. The analysis method for horizontal bearing characteristics of pile foundations normally in use at present is the p-y curve method recommended by American Petroleum Institute (API). To research the applicability of the p-y curve method recommended in calculating deformation of small-diameter rigid piles acted by horizontal loads, a three-dimensional finite element numerical model of small-diameter rigid piles with four different pile diameters was constructed based on a photovoltaic project. The horizontal bearing characteristics were analyzed and the p-y curves of pile foundations at different depths were obtained. On that basis, a modified p-y curve calculation model of small and medium diameter single piles in sandy soil was proposed considering pile diameters and depths. The results indicated that the horizontal displacement of small diameter rigid piles was inversely proportional to pile diameters, and the influence of pile diameters on pile bending moment was not significant. Compared with numerical simulations, the initial stiffness calculated by the p-y curve recommended by API was larger and the ultimate soil resistance was smaller, the p-y curre method recommended by API was not suitable for calculations of small-diameter rigid piles under horizontal loads. Based on the numerical simulation results, the relation equations among pile diameters, depth and initial foundation stiffness or ultimate soil resistance were fitted, and a modified model of the p-y curve was established. The modified model was verified that agreed fairly well with the actual values.
- photovoltaic pile /
- p-y curve method /
- sand /
- finite element calculation /
- small-diameter rigid p

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