基于水平低应变法的高承台桩缺陷检测研究

doi:10.3785/j.issn.1008-973X.2021.10.008

浙江大学学报(工学版)

2021, Vol. 55

Issue (10): 1867-1876 DOI: 10.3785/j.issn.1008-973X.2021.10.008

土木工程、交通工程

基于水平低应变法的高承台桩缺陷检测研究

赵爽1,2(

),吴君涛1,2,邱欣晨1,2,王奎华1,2,*(

),涂园1,2

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

Study on defect detection of extended pile shaft under lateral low-strain integrity test

Shuang ZHAO1,2(

),Jun-tao WU1,2,Xin-chen QIU1,2,Kui-hua WANG1,2,*(

),Yuan TU1,2

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

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摘要：

通过模型试验探究高承台桩埋藏段存在不同尺寸缺陷时的桩身质点水平速度响应，结合有限元(FEA)分析试验结果. 结果表明，基于桩的水平振动特性的低应变检测方法可以用于识别高承台桩桩身缺陷，且缺陷处截面直径越小，桩身质点水平速度响应曲线中缺陷处反射越明显. 随着缺陷高度的变化，缺陷处顶、底面反射信号可能会产生叠加或分离现象，导致不同缺陷高度下缺陷反射的波形不一致. 在数值模拟中，当采用柔性剪切梁单元模拟高承台桩时，数值模拟结果和试验结果吻合较好. 在实际工程中，当应用水平低应变法检测桩身完整性时，推荐采取近承台处激振、近承台处速度采集，可以根据缺陷处反射起振时间较精确地计算桩身缺陷埋深.

关键词： 高承台桩; 水平振动; 低应变; 缺陷检测

Abstract:

The lateral velocity response of an extended pile shaft with defects of various sizes in the buried section was analyzed through model experiment, and the results were analyzed by combining with finite element analysis (FEA) results. Results show that the low-strain integrity test based on the lateral vibration characteristics of the pile can be used to distinguish the defects on extended pile shaft. The smaller the cross-sectional diameter of the defect is, the more obvious the reflection of the defect on the lateral velocity response of the pile is. As the height of the defect changes, the reflection of the top and bottom of the defect may superpose or separate, reflecting waveforms of the defect under different defect heights are inconsistent. The FEA results accorded well with the experimental results when adopting the shear flexible beam element of FEA to simulate the extended pile shaft. It is recommended that the excitation and receiving positions are both near the cap when conducting low-strain integrity test based on the lateral vibration characteristics of the pile. The depth of the defect can be inferred from the arrival time of the reflection of the defect in practical engineering.

Key words: extended pile shaft lateral vibration low-strain defect detection

收稿日期: 2020-11-06 出版日期: 2021-10-27

CLC:

TU 473

基金资助: 国家自然科学基金资助项目（52178358，51779217）

通讯作者: 王奎华 E-mail: gnauhszhao@163.com;zdwkh0618@zju.edu.cn

作者简介: 赵爽（1996—），男，博士生，从事桩基动力学理论与土工测试方法的研究. orcid.org/0000-0001-5244-4760. E-mail： gnauhszhao@163.com

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引用本文:

赵爽,吴君涛,邱欣晨,王奎华,涂园. 基于水平低应变法的高承台桩缺陷检测研究[J]. 浙江大学学报(工学版), 2021, 55(10): 1867-1876.

Shuang ZHAO,Jun-tao WU,Xin-chen QIU,Kui-hua WANG,Yuan TU. Study on defect detection of extended pile shaft under lateral low-strain integrity test. Journal of ZheJiang University (Engineering Science), 2021, 55(10): 1867-1876.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2021.10.008 或 https://www.zjujournals.com/eng/CN/Y2021/V55/I10/1867

图 1 高承台单桩水平振动响应数值分析模型示意图

表 1 高承台单桩水平振动响应数值分析模型计算参数

图 2 激振力波形

图 3 基于水平振动的桩身缺陷深度预测算例

图 4 缺陷处反射波行程示意图

表 2 预测深度和缺陷实际深度的对比

图 5 不同激振力作用时间下的桩身质点水平速度响应

图 6 高承台单桩水平低应变法模型试验示意图

表 3 高承台单桩水平低应变法数值模型计算参数

图 7 完整桩桩身水平速度响应试验结果与数值模拟试验结果的对比

图 8 不同激振位置-接收位置组合下完整桩和缺陷桩桩身质点水平速度响应的对比

图 9 不同缺陷截面直径时的桩身质点水平速度响应

表 4 缺陷预测深度和实际深度的对比

图 10 不同缺陷高度时的桩身质点水平速度响应

表 5 计算深度和实际深度的对比

图 11 不同缺陷高度时的桩身质点水平速度响应

图 12 不同缺陷埋深时的桩身质点水平速度响应

表 6 计算深度和实际深度的对比

图 13 不同桩周土剪切波速时的桩身质点水平速度响应

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