带扩大桩靴桩侧灌浆预制桩抗拔特性试验研究

王奎华; 邱尚印; 冯银炜; 耿少寒; 吴君涛; 林虎文

doi:10.3969/j.issn.0258-2724.20240299

带扩大桩靴桩侧灌浆预制桩抗拔特性试验研究

doi: 10.3969/j.issn.0258-2724.20240299

王奎华^{1, 2,},
邱尚印^{1, 2},
冯银炜^{1, 2},
耿少寒^{1, 2},
吴君涛^{1, 2},
林虎文^3, ,

1.
浙江大学滨海和城市岩土工程研究中心，浙江杭州 310058
2.
浙江大学软弱土与环境土工教育部重点实验室，浙江杭州 310058
3.
中天建设集团有限公司，浙江杭州 310016

基金项目: 国家自然科学基金项目（52178358, 52108349）; 浙江省自然科学基金项目（LXZ22E080001）

详细信息

作者简介:
王奎华（1965—），男，教授，博士，研究方向为岩土与地下工程，E-mail：zdwkh0618@zju.edu.cn

通讯作者:
林虎文（1983—），男，工程师，研究方向为岩土工程施工技术和施工管理研究，E-mail：280354@qq.com

中图分类号: TU473.16
计量
- 文章访问数: 9
- HTML全文浏览量: 3
- PDF下载量: 1
- 被引次数: 0
出版历程
- 收稿日期: 2024-06-21
- 修回日期: 2024-11-20
- 网络出版日期: 2026-01-22

Experimental Study on Pullout Characteristic of Precast Pile Grouted Enlarged Toe

WANG Kuihua^{1, 2
,},
QIU Shangyin^{1, 2},
FENG Yinwei^{1, 2},
GENG Shaohan^{1, 2},
WU Juntao^{1, 2},
LIN Huwen^{3
, ,}

1.
Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
2.
Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education, Zhejiang University, Hangzhou 310058, China
3.
Zhongtian Construction Group Co., Ltd., Hangzhou 310016, China

摘要

摘要:
为研究带扩大桩靴桩侧同步灌浆预制桩（简称GET桩）的抗拔特性，开展室内砂土模型箱抗拔试验. 首先，通过连接PVC管和扩大件组装成带扩大桩靴的预制桩模型；然后，在桩身布设应变传感器，并在桩顶安装加荷装置和重力传感器；随后，通过在桩顶施加荷载获得不同桩型的抗拔曲线；最后，对比等截面桩、带扩大桩靴桩和带扩大桩靴桩侧灌浆桩的抗拔承载特性，并讨论扩底和灌浆对抗拔承载特性的影响. 试验结果表明：GET桩有效提升桩的抗拔承载力，在小位移下，扩大桩靴的存在使桩的抗拔承载力较等截面桩提高1倍，而桩侧灌浆使得其提升5～6倍；此外，GET桩改变了等截面桩的侧摩阻力发挥特性，扩展桩靴能提高总侧摩阻力的发挥速度和最大值，并在抗拔过程中提供一定的桩端阻力，灌浆能增强桩侧和桩端的阻力，为桩体的上半段总侧摩阻力提供初始总侧摩阻力，并倾向于将更多的荷载分配给扩大桩靴.
- 预制桩基础 /
- 扩大桩靴 /
- 桩侧灌浆 /
- 抗拔力 /
- 室内模型试验
Abstract:
In order to study the pullout characteristics of grouted enlarged toe precast pile (referred to as GET pile), a pullout experiment was carried out in a laboratory sand model box. Firstly, precast pile model with enlarged pile toe was assembled by connecting polyvinyl chloride (PVC) pipes and enlarged parts. Then, strain sensors were installed in the pile shaft, and the loading device and gravity sensor were arranged on the top of the piles. The pullout curves of different pile types were obtained by applying load on the top of the piles. Finally, the pullout bearing characteristics of the piles with equal cross section, piles with enlarged pile toe, and GET piles were compared, and the effects of enlarged base and grouting on pullout bearing characteristics were discussed. The experiment results show that GET pile can effectively improve the pile’s pullout bearing capacity. At small displacements, the pullout bearing capacity of piles with enlarged pile toe is twice that of piles with equal cross section and 5–6 times that of piles with pile side grouting. In addition, GET pile changes the mobilization characteristics of side friction resistance of the piles with equal cross section. The enlarged pile toe can increase the mobilization speed and maximum value of total side friction resistance and provide a certain amount of resistance at the pile end in the pullout process. Grouting can enhance the resistance on the pile side and the pile end, providing the initial total side friction resistance for the upper half of the pile shaft. There is a tendency to distribute more loads to the enlarged pile toe.
- precast pile foundation /
- enlarged pile toe /
- pile side grouting /
- pullout /
- laboratory model experiment

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图 1 扩大桩靴桩侧同步灌浆预制桩

Figure 1. GET pile

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图 2 模型桩的不同处理方式

Figure 2. Different treatment methods of model piles

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图 3 抗拔装置组装示意

Figure 3. Pullout device assembling

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图 4 等截面桩的上拔荷载-上拔量曲线

Figure 4. Uplift load–uplift displacement curve for piles with equal cross section

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图 5 等截面桩的上拔量-总侧摩阻力曲线

Figure 5. Uplift displacement–total side friction resistance curves of piles with equal cross section

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图 6 扩大桩靴预制桩的上拔荷载-上拔量曲线

Figure 6. Uplift load–uplift displacement curve for precast piles with enlarged pile toe

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图 7 扩大桩靴预制桩的上拔量-总阻力及其贡献

Figure 7. Uplift displacement–total resistance and corresponding contribution curves of precast piles with enlarged pile toe

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图 8 GET桩的U-δ 曲线

Figure 8. U–δ curve for GET piles

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图 9 GET桩的上拔量-总阻力及其贡献

Figure 9. Uplift displacement–total resistance and corresponding contribution curves of GET piles

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图 10 GET桩的上拔量-总侧摩阻力曲线

Figure 10. Uplift displacement–total side friction resistance curves of GET piles

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图 11 3类桩型的上拔荷载-上拔量曲线

Figure 11. Uplift load–uplift displacement curves for three types of piles

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图 12 3种桩的上拔量-总侧摩阻力曲线

Figure 12. Uplift displacement–total side friction resistance curves of three types of piles

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图 13 三种桩的上拔量-总端阻力曲线

Figure 13. Uplift displacement–total tip resistance curves of three types of piles

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图 14 灌浆与未灌浆桩的阻力发挥情况

Figure 14. Resistance mobilization of piles with or without grouting

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图 15 圆柱剪切面法计算示意

Figure 15. Cylindrical shear surface calculation method

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表 1 材料/仪器属性表

Table 1. Material/instrument properties

材料/仪器	属性	备注
土	石英细砂，中密砂	逐层击实法制备，单次填筑0.2 m
水泥浆	P.O 42.5水泥	水灰比1∶0.6，养护7 d后可使用
位移测量设备	百分表	量程99 mm，最小刻度为0.01 mm
荷载测量设备	荷载测量仪	量程为1 000 kg，最小刻度为0.01 kg
应变测量设备	BX120-8AA应变片	黏结采用速干胶，防水保护采用环氧树脂

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表 2 3类桩型的抗拔承载特性

Table 2. Pullout bearing characteristics of three types of piles

桩型	竖向极限抗拔位移/mm	竖向极限抗拔承载力/N
等截面桩	23.12	427.30
扩大桩靴预制桩	9.90	287.10
GET桩	6.71	450.80

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表 3 3类桩型的峰值情况

Table 3. Peak values of three types of piles

研究类型	桩长/扩大桩靴直径	扩大桩靴直径/桩身直径	抗拔承载力提高系数
GET桩	16.00	1.25	小位移6.00～7.00，大位移1.05
扩底抗拔桩^[31]	34.00	1.78	1.50
扩底抗拔桩^[31]	25.00	2.00	1.90
扩孔灌浆管桩^[5]	20.00	1.48	1.67
扩孔灌浆管桩^[5]	19.00	1.58	1.67
注：抗拔承载力提高系数=GET桩抗拔力/等截面桩抗拔力.

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表 4 灌浆与未灌浆桩的阻力峰值

Table 4. Peak resistance values of piles with or without grouting N

桩型	总侧摩阻力峰值	总端阻力峰值
灌浆	9.90	287.10
未灌浆	6.71	450.80

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