桩网复合地基离心模型试验中桩顶轴力测试方法研究

张军杰; 顾行文; 任国峰; 周春儿; 王年香

doi:10.11779/CJGE2024S10049

桩网复合地基离心模型试验中桩顶轴力测试方法研究 English Version

张军杰^1,,
顾行文^{2, 3},
任国峰^{2, 3, ,},
周春儿⁴,
王年香^{2, 3}

1.
河南省核技术应用中心, 河南郑州 450000
2.
南京水利科学研究院岩土工程研究所, 江苏南京 210024
3.
水灾害防御全国重点实验室, 江苏南京 210029
4.
广东省航运规划设计院有限公司, 广东广州 510050

基金项目:

国家重点研发计划“交通基础设施”重点专项2023年度项目 2023YFB2604200

详细信息

作者简介:
张军杰(1973—)，陕西宝鸡人，学士，高级工程师，主要从事地质灾害治理、山水林田湖草地质环境治理及岩土工程勘察工作。E-mail: 445149227@qq.com

通讯作者:
任国峰, E-mail: gfren@nhri.cn

中图分类号: TU435
计量
- 文章访问数: 103
- HTML全文浏览量: 21
- PDF下载量: 20
出版历程
- 收稿日期: 2024-04-28
- 刊出日期: 2024-07-31

Test method for axial force at pile top in centrifugal model tests on pile-net composite foundation

ZHANG Junjie^1,,
GU Xingwen^{2, 3},
REN Guofeng^{2, 3, ,},
ZHOU Chuner⁴,
WANG Nianxiang^{2, 3}

1.
Henan Nuclear Technology Application Center, Zhengzhou 450000, China
2.
Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China
3.
The National Key Laboratory of Water Disaster Prevention, Nanjing 210029, China
4.
Guangdong Province Planning & Design Institute for Water Transportation Co., Ltd., Guangzhou 510050, China

摘要

摘要: 桩网复合地基是常见的软土加固措施。在开展桩网复合地基离心模型试验时，为了分析桩土应力比，需要测量桩顶轴力和桩间土压力。微型土压力计在离心模型试验中已经得到广泛应用，但尚无成熟的微型桩顶轴力测试传感器。利用模型桩的桩帽，开发了一种离心模型试验专用桩顶轴力测试方法，标定结果显示该方法测试线性度好。通过某桩网复合地基离心模型试验和数值分析的桩土应力比结果对比分析，验证了该方法的测试效果。
- 桩网复合地基 /
- 离心模型试验 /
- 桩顶轴力 /
- 测试 /
- 桩土应力比
Abstract: The pile-net composite foundation is a common soft soil reinforcement measurement. In order to analyze the pile-soil stress ratio, it is necessary to measure the axial force at the pile top and the soil pressure between piles in the centrifugal model tests. The mini-earth pressure cells have been widely used in the centrifugal model test, but there is no commonly accepted mini-axial force sensor. In this study, a special method is developed for testing the axial force at the top of piles in the centrifugal model tests by using pile caps. Great linearity is shown through the calibration data. The effects of the proposed method are verified by the pile-soil stress ratio results from the centrifugal model test and numerical analysis of a pile-net composite foundation.
- pile-net composite foundation /
- centrifugal model test /
- axial force at pile top /
- measurement /
- pile-soil stress ratio

HTML全文

图 1 复合地基设计图

Figure 1. Profile of composite foundation design

下载: 全尺寸图片幻灯片

图 2 离心模型试验布置图

Figure 2. Layout of centrifuge model tests

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图 3 新型轴力计示意图

Figure 3. Schematic of new type of mini-axial force sensor

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图 4 新型轴力计标定

Figure 4. Calibration of new axial force sensors

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图 5 标定结果

Figure 5. Results of calibration

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图 6 复合地基CFG桩桩顶轴力过程线

Figure 6. Load-time curves at top of CFG pile

下载: 全尺寸图片幻灯片

图 7 桩土应力比分布

Figure 7. Distribution of pile-soil stress ratio

下载: 全尺寸图片幻灯片

表 1 复合地基CFG桩顶轴力特征值

Table 1 Loads on top of CFG pile of composite foundation

测点		Tf1	Tf2	Tf3	Tf4
桩长、间距/m		10，1.8	14，1.8	16，1.8	16，1.65
上覆荷载/kPa		150	232	319	350
轴力/kN	堆载期	184	344	539	543
	试堆期	185	349	522	528
	恒载365 d	190	354	475	496
	恒载408 d	191	353	474	495

下载: 导出CSV

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