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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参考文献(43)

[1]	OTHMAN A R, RUSHDI A T. Assessment of roof top BIPV application of sample houses in Shah Alam[J]. Asian Journal of Quality of Life, 2018, 3(9):25-35.
[2]	张文达.广州地区岭南传统建筑光伏一体化设计策略研究[D].广州:华南理工大学, 2018.
[3]	刘丰敏,杜风雷.光伏支架基桩础水平承载力计算方法与试验研究[C]//第十届深基础工程发展论坛论文集.北京:中国建筑工业出版社, 2020:185-187.
[4]	丁晓勇,陈屏翰,邢皓枫.光伏支架下钢管桩现场载荷试验及其承载特性分析[C]//工业建筑2022年学术交流会论文集, 2022.
[5]	居俊.软土中桩顶水平承载离心模型试验[J].工业建筑, 2017, 47(8):100-105.
[6]	李洪江,童立元,刘松玉,等.大直径超长灌注桩水平承载性能的参数敏感性[J].岩土力学, 2018, 39(5):1825-1833.
[7]	王学亮.光伏支架预应力管基桩础裂缝调查及分析[J].建材与装饰, 2020(18):44, 47.
[8]	AGARWAL A, IRTAZA H, KHAN M A. Experimental study of pulling-out capacity of foundation for solar array mounting frames[J]. Indian Geotechnical Journal, 2020, 51(2):414-420.
[9]	REESE L C, COX W R, KOOP F D. Analysis of Laterally Loaded Piles in Sand[C]//Proceedings of 6th Annual Offshore Technology Conference. 1974:473-485.
[10]	American Petroleum Institute. Recommended practice for planning, designing and constructing fixed offshore platformsworking stress design[S]. Washington:American Petroleum Institute Publishing Services, 2005.
[11]	张海洋,刘润,袁宇,等.海上大直径单基桩础p-y曲线修正[J].水利学报, 2020, 51(2):201-211.
[12]	薛佩佩,王栋,郑敬宾等.水平荷载作用下砂土中非柔性桩的p-y曲线修正[J].中国海洋大学学报(自然科学版), 2023, 53(2):134-140.
[13]	LESNY K, WIEMANN J. Finite-element-modelling of large diameter monopiles for offshore wind energy converters[C]//Geocongress 2006:Geotechnical Engineering in the Information Technology. 2006.
[14]	朱斌,熊根,刘晋超,等.砂土中大直径单桩水平受荷离心模型试验[J].岩土工程学报, 2013, 35(10):1807-1815.
[15]	朱斌,杨永垚,余振刚,等.海洋高基桩础水平单调及循环加载现场试验[J].岩土工程学报, 2012, 34(6):1028-1037.
[16]	朱斌,朱瑞燕,罗军,等.海洋高基桩础水平大变位性状模型试验研究[J].岩土工程学报, 2010, 32(4):521-530.
[17]	付毳,庄一舟,陈宝春,等.砂土中微型桩p-y曲线研究[J].地下空间与工程学报, 2017, 13(5):1271-1279.
[18]	SØRENSEN S P H. Soil-structure interaction for nonslender, large-diameter offshore monopoles[D]. Alborg:Aalborg University, 2012.
[19]	KALLEHAVE D, THILSTED C L, LIINGAARD M A. Modification of the API p-y formulation of initial stiffness of sand[C]//7th International Conference:Offshore Site Investigation and Geotechnics:Integrated Geotechnologies-Present and Future. 2012.
[20]	胡中波,翟恩地,罗仑博,等.基于静载试验的海上风电钢管桩砂土p-y曲线研究[J].太阳能学报, 2019, 40(12):3571-3577.
[21]	罗仑博,王媛,翟恩地,等.基于现场试验的钢管桩分层土p-y曲线研究[J].太阳能学报, 2019, 40(11):3258-3264.
[22]	孙毅龙,许成顺,杜修力,等.海上风电大直径单桩的修正p-y曲线模型[J].工程力学, 2021, 38(4):44-53.
[23]	陈晓路,管春雨,张管武,等.近海风力机水平受荷单桩简化p-y曲线研究[J].太阳能学报, 2022, 43(5):366-371.
[24]	张小玲,朱冬至,许成顺,等.强度弱化条件下饱和砂土地基中桩-土相互作用p-y曲线研究[J].岩土力学, 2020, 41(7):2252-2260.
[25]	唐亮,刘书幸,凌贤长,等.土体液化过程中桩-土动力相互作用p-y曲线模型[J].自然灾害学报, 2022, 31(2):156-164.
[26]	胡安峰,南博文,陈缘,等.基于砂土刚度衰减模型的修正p-y曲线法[J].上海交通大学学报, 2020, 54(12):1316-1323.
[27]	刘晋超,熊根,朱斌,等.砂土海床中大直径单桩水平承载与变形特性[J].岩土力学, 2015, 36(2):591-599.
[28]	胡烨之,鲁子爱,翟秋,等.软黏土中大直径加翼桩p-y曲线探讨[J].水利水电技术, 2018, 49(5):143-152.
[29]	孟晓伟,翟恩地,许成顺. p-y曲线对成层土体中大直径单桩的适用性研究[J].海洋技术学报, 2019, 38(2):105-112.
[30]	陈国荣.有限单元法原理及运用[M].北京:科学出版社, 2009.
[31]	余世章,李飒.复合荷载下海上钢管基桩础p-y曲线法研究[J].水力发电学报, 2018, 37(1):101-109.
[32]	LI W C, ZHU B T, YANG M. Static response of monopile to lateral load in overconsolidated dense sand[J]. Journal of Geotechnical&Geoenvironmental Engineering, 2017, 143(7):1-12.
[33]	GEORGIADIS M. Development of p-y curves for layered soils[C]//Geotechnical Practice in Offshore Engineering. New York:American Society of Civil Engineers. 1983:536-545.
[34]	TERZAGHI K. Evaluation of coefficient of subgrade reaction[J]. Géotechnique, 1955, 5(4):197-226.
[35]	KIM B T, KIM N K, LEE W J, et al. Experimental load-transfer curves of laterally loaded piles in Nak-Dong river sand[J]. Journal of Geotechnical&Geoenvironmental Engineering, 2004, 130(4):416-425.
[36]	ASHFORD S A, JUIRNARONGRIT T. Evaluation of pile diameter effect on initial modulus of subgrade reaction[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2003, 129(3):234-242.
[37]	FAN C C, LONG J H. Assessment of existing methods for predicting soil response of laterally loaded piles in sand[J]. Computers and Geotechnics, 2005, 32(4):274-289.
[38]	LING L F. Back analysis of lateral load test on piles[R]. Auckland:Faculty of Engineering, University of Auckland, 1988.
[39]	孙希,黄维平.基于实测数据的海上风电大直径桩p-y曲线研究[J].太阳能学报, 2016, 37(1):216-221.
[40]	BROMS B B. Lateral resistance of piles in cohesionless soils[J]. Journal of the Soil Mechanics and Foundations Division, 1964, 90(3):123-156.
[41]	GUO W D, ZHU B T. Laterally loaded fixed-head piles in sand[C]//Proc., 9th Australia-New Zealand Conf. on Geomechanics. 2004:88-94.
[42]	KLINKVORT R T, HEDEDAL O, SPRINGMAN S M. Scaling issues in centrifuge modelling of monopiles[J]. International Journal of Physical Modelling in Geotechnics, 2013, 13(2):38-49.
[43]	鲍金虎,苏静波,吴锋,等.深厚软黏土地基中大直径单基桩础现场水平受荷试验及p-y曲线适用性研究[J].河海大学学报(自然科学版), 2023, 51(3):127-134.