[1]杨涛,童立元,潘皇宋.堆载及基坑开挖作用下被动桩水平受力及变形响应[J].东南大学学报(自然科学版),2021,51(3):449-455.[doi:10.3969/j.issn.1001-0505.2021.03.013]
 Yang Tao,Tong Liyuan,Pan Huangsong.Lateral force and displacement of passive pile under surcharge loading and excavation of foundation pit[J].Journal of Southeast University (Natural Science Edition),2021,51(3):449-455.[doi:10.3969/j.issn.1001-0505.2021.03.013]
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堆载及基坑开挖作用下被动桩水平受力及变形响应()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
51
期数:
2021年第3期
页码:
449-455
栏目:
交通运输工程
出版日期:
2021-05-20

文章信息/Info

Title:
Lateral force and displacement of passive pile under surcharge loading and excavation of foundation pit
作者:
杨涛童立元潘皇宋
东南大学岩土工程研究所, 南京 210096
Author(s):
Yang Tao Tong Liyuan Pan Huangsong
Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, China
关键词:
被动桩 水平附加应力 三参数地基模型 有限差分法
Keywords:
passive pile lateral additional stress three-parameter foundation model finite difference method
分类号:
U451
DOI:
10.3969/j.issn.1001-0505.2021.03.013
摘要:
为了研究被动桩在堆载及基坑开挖卸荷作用下的水平受力及变形规律,基于三参数地基模型,提出一种被动桩受力变形响应数值计算方法.首先,基于布西奈斯克解及明德林解析解,利用复合辛普森公式进行数值积分,求解得到堆载及开挖卸荷条件下被动桩处的水平附加应力.然后,采用Kerr地基模型,建立被动桩的挠曲微分方程,并利用有限差分法得到桩体挠曲微分方程矩阵表达式.计算结果表明:坑底卸荷引起的桩体水平附加应力约为侧壁卸荷作用下桩体水平附加应力的1/3,坑底卸荷对被动桩的影响不可忽略;堆载大小对桩体水平位移的影响略大于堆载区域尺寸,应避免集中堆载;基坑开挖深度对桩体水平位移的影响远大于基坑开挖面尺寸,开挖过程中宜采用梯次开挖方式.
Abstract:
To study the lateral force and displacement rules of a passive pile under the action of surcharge loading and excavation unloading, a numerical calculation method for the force and deformation response of the passive pile was proposed by using the three-parameter foundation model. Firstly, based on the Boussiesq solution and Mindlin solution, the lateral additional stress at the position of the passive pile caused by surcharge and excavation were calculated respectively by the composite Simpson formula. Then, the deflection differential equation of the passive pile was established by the Kerr-type foundation model. The matrix expression of the deflection differential equation of the pile was obtained by the finite difference method. The calculation results show that the lateral additional stress at the pile caused by unloading at the bottom of the pit is about 1/3 of that caused by unloading on the side wall, so the lateral additional stress caused by the unloading at the bottom of the pit cannot be ignored. The influence of the surcharge size on the deflection of the pile is slightly greater than that of the surcharge area, and the concentrated surcharge should be avoided. The influence of the excavation depth on the deflection of the pile is far greater than that of the excavation area, and the multi-stage excavation method should be adopted.

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备注/Memo

备注/Memo:
收稿日期: 2020-11-07.
作者简介: 杨涛(1991—),男,博士生;童立元(联系人),男,博士,教授,博士生导师,101010519@seu.edu.cn.
基金项目: 国家自然科学基金资助项目(41572273,51878158)、江苏省自然科学基金资助项目(BK20181282).
引用本文: 杨涛,童立元,潘皇宋.堆载及基坑开挖作用下被动桩水平受力及变形响应[J].东南大学学报(自然科学版),2021,51(3):449-455. DOI:10.3969/j.issn.1001-0505.2021.03.013.
更新日期/Last Update: 2021-05-20