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浙江大学学报(工学版)
浙江大学学报(工学版)  2021, Vol. 55 Issue (12): 2243-2251    DOI: 10.3785/j.issn.1008-973X.2021.12.003
土木工程、交通工程     
敞口管型桩压入对既有受荷桩基承载性状影响
王磊1,2(),俞峰1,2,*(),潘静杰1,2
1. 浙江理工大学 基础结构技术研究所，浙江 杭州 310018
2. 浙江省装配式混凝土工业化建筑工程技术研究中心，浙江 杭州 310018
Influence of jacking open-ended tubular piles on bearing behavior of existing in-service piles
Lei WANG1,2(),Feng YU1,2,*(),Jing-jie PAN1,2
1. Institute of Foundation and Structure Technologies, Zhejiang Sci-Tech University, Hangzhou 310018, China
2. Zhejiang Provincial Engineering and Technology Research Center of Assembly-Concrete Industrialized Buildings, Hangzhou 310018, China
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摘要：

基于经典桩侧摩阻力公式和圆孔扩张理论，优化考虑土压力系数、土塞增长率、扩孔塑性半径等问题，计算新增管桩的植入对在役桩承载性状的影响. 对比分析有限元的软件与理论计算结果，发现管型桩贯入引致的桩间土挤土效应，使在役桩侧摩阻力在一定深度范围内增加，且桩长越长、桩间距越小，贡献越明显. 新增桩与在役桩的距离小于3倍桩径，会形成局部群桩效应，使群桩协同工作时的桩顶沉降增加；距离大于6倍桩径，管型桩压入对既有桩侧摩阻力、群桩协同工作效应的影响较小.
关键词： 地下增层;  敞口管型桩;  在役桩;  承载性状;  群桩效应    
Abstract:

Based on the classical pile side resistance formula and the round hole expansion theory, the effect of the implantation of new pipe piles on the bearing characteristics of in-service pile was calculated by considering the soil pressure coefficient, the growth rate of the soil plug, the plastic radius of the expansion hole and so on. Comparing the software and theoretical calculation results of finite factors, the effect of inter-pile soil extrusion caused by pipe piles is induced, so that the resistance on the side of the serving pile increases in a certain depth range, and the longer the pile length and the smaller the pile spacing, the more obvious the contribution is. The distance between the new pile and the in-service pile is less than 3 times the pile diameter, a local pile effect is formed so that the settlement of the top of the pile increases, when the pile works together. The distance is greater than 6 times the pile diameter, and the pressure of the pipe pile will has less effect on the existing pile side resistance and the group pile co-operation effect.
Key words: underground-storey supplement    open-ended tubular piles    in-service pile    bearing behavior    pile group effect
收稿日期: 2021-01-17 出版日期: 2021-12-31
CLC:  TU 473.1  
基金资助: 浙江省自然科学基金重点资助项目(LZ17E080002)；浙江省教育厅科研资助项目(Y201942631)
通讯作者: 俞峰     E-mail: 2316376262@qq.com;pokfulam@zstu.edu.cn
作者简介: 王磊（1995—），男，硕士生，从事桩基工程研究.orcid.org/0000-0002-2965-4011. E-mail: 2316376262@qq.com
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引用本文:

王磊,俞峰,潘静杰. 敞口管型桩压入对既有受荷桩基承载性状影响[J]. 浙江大学学报(工学版), 2021, 55(12): 2243-2251.

Lei WANG,Feng YU,Jing-jie PAN. Influence of jacking open-ended tubular piles on bearing behavior of existing in-service piles. Journal of ZheJiang University (Engineering Science), 2021, 55(12): 2243-2251.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2021.12.003    或    https://www.zjujournals.com/eng/CN/Y2021/V55/I12/2243

图 1  既有在役桩单位侧摩阻力计算点示意简图
图 2  管型桩圆孔扩张应力模型
图 3  沉桩挤土应力随径向变化图
层号 名称 h/m $ \gamma $/(kN·m?3) $ k $/(m·d?1) $ c $/kPa $ \varphi $/(°) $ E_{50}^{{\text{ref}}} $/MPa $E_{{\rm{oed}}}^{{\rm{ref}}}$/MPa $ E_{{\text{ur}}}^{{\text{ref}}} $/MPa $ \lambda $
1 素填土 5.1 17.7 5.3×10?4 9.0 12.0 20.0 20.0 60.0 0.35
2 淤泥质粉质黏土 11.5 17.9 2.2×10?4 11.2 19.5 17.5 17.5 87.5 0.35
3 淤泥质黏土 6.0 17.1 1.3×10?4 19.6 7.0 15.0 42.2 75.0 0.35
4 黏土 5.0 19.0 3.0×10?4 37.0 14.5 36.5 35.0 109.5 0.35
5 粉质黏土 5.0 18.9 3.9×10?4 35.0 16.0 35.0 35.0 105.0 0.35
6 黏土 5.4 18.0 3.0×10?4 52.5 9.0 22.5 38.5 90.0 0.35
7 强风化安山岩 12.0 22.0 7.8×10?2 450.0 53.0 75.0 74.4 225.0 0.25
表 1  各土层物理力学参数
d/m Qsu /kN S1/% S2/%
简单应力法 圆孔扩张法 有限元法
补桩前 1041.2 943.1 981.4 6.1 ?3.9
3D 1305.4 1201.1 1233.8 5.8 ?2.6
4D 1279.4 1183.5 1183.5 8.1 ?5.0
5D 1129.3 984.3 1042.3 8.3 ?5.5
6D 1074.5 934.7 991.2 8.4 ?5.7
表 2  新增桩长为25 m时不同桩间距下在役桩极限侧摩阻力对比
L/m Qsu /kN S1/% S2/%
简单应力法 圆孔扩张法 有限元法
补桩前 1041.2 943.1 981.4 6.1 ?3.9
15 1085.4 981.7 1001.3 8.4 2.0
20 1190.2 1042.2 1097.5 8.5 5.0
25 1305.4 1201.1 1233.8 5.8 2.6
表 3  新增桩与在役桩间距为3D时不同桩长下在役桩极限侧摩阻力对比
d/m Qpu /kN S3 /%
球孔扩张法 有限元法
补桩前 5407.4 5535.2 ?2.3
3D 5731.4 5979.3 ?4.1
4D 5594.3 5871.3 ?4.7
5D 5519.0 5802.6 ?4.9
6D 5438.6 5701.1 ?4.6
表 4  新增桩长为25 m时不同桩间距下在役桩极限桩端阻力对比
图 4  压入不同长度的管型桩在役桩桩周侧摩阻力随深度的分布
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