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工程科学与技术:2022,54(6):124-134
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组合荷载作用下倾斜桩基横向承载特性
(成都理工大学 环境与土木工程学院,四川 成都 610059)
Lateral Bearing Characteristics of Inclined Pile Foundation Under Combined Load
(College of Environment and Civil Eng., Chengdu Univ. of Technol., Chengdu 610059, China)
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投稿时间:2021-08-10    修订日期:2021-10-06
中文摘要: 为研究竖向与横向荷载组合作用下倾斜桩基的横向承载特性,结合珠海市横琴桥桩基选型工程,开展了室内模型试验和数值模拟,在此基础上分析不同桩身倾角、桩顶间距、竖向荷载及层厚比条件下倾斜桩基在组合荷载下的受力及变形特性。结果表明:增大桩身倾角、桩顶间距、承台顶竖向荷载、层厚比有利于提高倾斜桩基横向承载力;其中:桩顶间距对桩基横向承载力的影响最大。桩身倾角、承台顶竖向荷载、层厚比对桩基横向承载力影响依次逐渐减小。倾斜桩基中的2#角桩桩顶弯矩最大,1#角桩桩顶弯矩次之,3#中桩桩顶弯矩最小;各基桩桩顶弯矩随桩身倾角、桩顶间距的增大而减小,随竖向荷载的增大先减小后增大;各基桩桩顶横向荷载分担随桩身倾角、桩顶间距及承台顶竖向荷载的增大趋于均匀。倾斜桩基右侧地基土横向变形随横向荷载的增大而增大,桩基左侧地基土横向变形随横向荷载的增大几乎不变,但其桩–土脱离程度逐渐增大;增大桩身倾角可减小桩–土脱离的程度;靠近承台底的地基土位移等值线呈波浪形,远离承台底的地基土位移等值线呈椭圆形。研究成果可指导相似工程的设计和施工。
Abstract:To study the lateral bearing characteristics of inclined pile foundations under the combined action of vertical and lateral loads, indoor model tests and numerical simulations were carried out in conjunction with the pile foundation selection project of Hengqin Bridge in Zhuhai city. On this basis, the stress and deformation characteristics of inclined pile foundations under combined loads were analyzed under different pile inclinations, different pile top spacing different vertical loads, and different layer thickness ratio conditions. The results showed that increasing the pile inclination angle, the spacing between pile tops, the vertical load on the top of the pile cap, and the layer thickness ratio were beneficial to increase the lateral bearing capacity of the inclined pile foundation. The spacing between pile tops had the greatest influence on the lateral bearing capacity of the pile foundation, followed by the pile inclination angle, the vertical load on the top of the pile cap, and the layer thickness ratio. In the inclined pile foundation, the bending moment at the top of corner pile 2# was the largest, followed by corner pile 1# and middle pile 3#. The bending moment at the top of each foundation pile decreased with the increase of pile inclination and pile top spacing, and first decreased and then increased with the increase of vertical load; The transverse load sharing on the top of each foundation pile tended to be uniform with the increase of pile inclination, pile top spacing and vertical load on the top of the bearing platform. The lateral deformation of foundation soil on the right side of inclined pile foundation increased with the increase of lateral load, and the lateral deformation of foundation soil on the left side of pile foundation was almost unchanged with the increase of lateral load, but the degree of pile-soil separation increased gradually; Increasing the inclination angle of the pile could reduce the degree of pile-soil separation; The displacement isoline of foundation soil near the bottom of pile cap was wavy, and the displacement isoline of foundation soil far from the bottom of pile cap was elliptical. The results can serve for the design and construction of similar engineering.
文章编号:202100782     中图分类号:TU473.1    文献标志码:
基金项目:国家自然科学基金项目(42277149);中铁二局科研计划项目(二铁四司科2021字第10号);地质灾害防治与地质环境保护国家重点实验室课题(SKLGP2020Z009)
作者简介:第一作者:李龙起(1986-),男,副教授,博士.研究方向:边坡工程及地基工程.E-mail:287820171@qq.com
引用文本:
李龙起,赵皓璆.组合荷载作用下倾斜桩基横向承载特性[J].工程科学与技术,2022,54(6):124-134.
LI Longqi,ZHAO Haoqiu.Lateral Bearing Characteristics of Inclined Pile Foundation Under Combined Load[J].Advanced Engineering Sciences,2022,54(6):124-134.