竖向荷载对陡岩墩式码头梅花形五桩双向承载特性影响研究  

Influence of Vertical Load on Bidirectional Bearing Characteristics of Quincunx on Steep Wharf Pier

作　　者：王永艺 WANG Yongyi(School of Civil Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学土木工程学院,辽宁大连116024

出　　处：《东莞理工学院学报》2021年第1期74-81,共8页Journal of Dongguan University of Technology

摘　　要：针对竖向荷载变化下的陡岩群桩(梅花形五桩)双向承载工况,采用ABAQUS有限元软件,建模过程考虑陡岩群桩基础施工承载等环节,以及软岩与桩接触非线性影响,构建陡岩梅花形五桩三维模型,计算分析竖向荷载对陡岩墩式码头梅花形五桩双向承载特性的影响。研究表明,竖向荷载对陡岩墩式码头梅花形五桩双向承载特性的影响,与群桩基础的空间效应、群桩桩身嵌固程度、桩前岩体抗力等综合作用相关。其中,R=0°~15°,随着竖向作用力的增加,承台下各桩桩顶的水平位移得到一定的抑制;但竖向作用力过大,承台下各桩桩顶的水平位移会随着其增加而增大;R=30°~45°,竖向作用力对各桩桩顶水平位移的抑制作用不明显,其桩顶水平位移呈缓变-陡增的趋势。R=0°~45°的梅花形五桩,其前排桩竖向承载发挥程度较后排桩大。R=15°~45°,其后排桩水平承载发挥程度较前排桩大。在实际工程中,可根据受力过程中群桩基础力学响应变化等,进行相应加强设计。According to the bidirectiona bearing condition of steep rock group pile(Quincunx/five-pile)under vertical load change,the ABAQUS finite element software is used to consider the construction bearing of steep rock group pile foundation and the nonlinear influence of soft rock contact with pile,calculating and analyzing the influence of vertical load on two-way bearing characteristics of five-pile on steep wharf pier.The results show that the influence of vertical load on the two-way bearing characteristics of plum-shaped five piles of steep pier is related to the spatial effect of group pile foundation,the degree of embedded pile body and the resistance of rock mass before pile.When R=0°~15°,with the increase of vertical load,the horizontal displacement of the pile top under bearing platform is restrained to some extent;however,if the vertical load is too large,the horizontal displacement of the pile top will increase with the increase of vertical load.When R=30°~45°,the vertical load has no obvious inhibition effect on the horizontal displacement of the pile top,and the horizontal displacement of that tends to change slowly and increase sharply.For quincunx piles with R=0°~45°,the vertical bearing degree of the front row piles is greater than that of the rear row piles.R=15°~45°,the horizontal bearing degree of the rear row piles is greater than that of the front row piles.In practical engineering,the corresponding strengthening design can be carried out according to the mechanical response changes of group piles foundation in the process of stress.

关 键 词：竖向荷载 陡岩 墩式码头 梅花形五桩 双向承载 

分 类 号：TU473.1[建筑科学—结构工程]