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浙江大学学报(工学版)
浙江大学学报(工学版)  2020, Vol. 54 Issue (8): 1593-1603    DOI: 10.3785/j.issn.1008-973X.2020.08.019
土木工程、交通工程     
基于桩侧虚土桩模型的桩-桩芯土竖向动力响应
肖偲1(),王奎华1,*(),王孟波2
1. 浙江大学 滨海与城市岩土工程研究中心，软弱土与环境土工教育部重点实验室，浙江 杭州 310058
2. 宁波中淳高科股份有限公司，浙江 宁波 315000
Vertical dynamic response of pile-soil plug based on surrounding fictitious soil pile model
Si XIAO1(),Kui-hua WANG1,*(),Meng-bo WANG2
1. Research Center of Coastal and Urban Geotechnical Engineering, Key Laboratory of soft soils and Geoenvironmental Engineering of Ministry of Education, Zhejiang University, Hangzhou 310058, China
2. ZCONE High-tech Pile Industry Holdings Co. Ltd, Ningbo 315000, China
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摘要：

考虑桩芯水泥土与桩身的较强黏结性，提出桩侧虚土桩模型来模拟桩与桩芯土塞的相互作用，建立含水泥土土塞的竹节桩纵向动力模型. 通过阻抗函数递推方法得到简谐激振下桩顶动力响应频域解析解和时域半解析解，与三维有限元数值模型进行拟合对比，验证理论模型的合理性；通过参数分析研究水泥土相关参数对桩顶动力特性的影响；通过室内水泥土试验以及现场桩基试验，研究竹节桩桩芯水泥土对桩身低应变测试曲线的影响；根据实测曲线对模型中的关键参数进行拟合反演. 结果表明：竹节桩桩芯土塞高度增加会引起桩底反射信号减弱以及桩身综合波速减小，土塞模量增加会引起桩底反射信号减弱和轻微提前；拟合得到的虚土桩尺寸系数较为稳定；桩芯水泥土的阻尼系数与经验公式计算结果差异较大；在参数拟合过程中，理论模型计算得到的结果与实测曲线较符合，本研究理论模型可以较好地模拟桩与水泥土的动力相互作用.
关键词： 竹节桩;  水泥土土塞;  桩侧虚土桩;  低应变测试;  现场试验    
Abstract:

The surrounding fictitious soil pile model was proposed to simulate the interaction between pile and pile soil plug, and the vertical dynamic model of the pile and cement soil plug was built, considering the strong cohesiveness between the pile and inner cement soil. The analytical solution in the frequency domain and the semi-analysis in the time domain of dynamic response of pile top under simple harmonic excitation were derived by impedance function transfer method. The reliability of the solution was verified by comparing with that of 3D finite element model. A parameter study was conducted to investigate the influence of cement soil parameters on the dynamic characteristics at pile top. Laboratory tests on cement soil and field tests were performed to investigate the influence of inner cement soil on low-strain test curves of pile, and the key parameters in the model were fitted and inverted based on the measured curves. Results show that the reflection signal from the pile tip becomes weaker and the integrated velocity of the pile becomes smaller with the increase of the height of cement soil plug. However, the reflection signal from the pile tip becomes weaker and the integrated velocity of the pile becomes bigger slightly with the increase of the modulus of the cement soil plug. The size of fictitious soil pile obtained by inversion keeps stable but the damping coefficient shows big difference with that from empirical formula. The measured curves show a good agreement with calculated curves, which indicates that the proposed theoretical model can well simulate the dynamic interaction between piles and inner cement soil.
Key words: nodular pipe pile    cement soil plug    surrounding fictitious soil pile    low-strain test    field test
收稿日期: 2019-06-27 出版日期: 2020-08-28
CLC:  TU 473  
基金资助: 国家自然科学基金资助项目（51579217，51779217）
通讯作者: 王奎华     E-mail: xiaosi_508@zju.edu.cn;zdwkh0618@zju.edu.cn
作者简介: 肖偲（1991—），男，博士生，从事桩基动力学和土工测试研究. orcid.org/0000-0002-3096-1764. E-mail： xiaosi_508@zju.edu.cn
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引用本文:

肖偲,王奎华,王孟波. 基于桩侧虚土桩模型的桩-桩芯土竖向动力响应[J]. 浙江大学学报(工学版), 2020, 54(8): 1593-1603.

Si XIAO,Kui-hua WANG,Meng-bo WANG. Vertical dynamic response of pile-soil plug based on surrounding fictitious soil pile model. Journal of ZheJiang University (Engineering Science), 2020, 54(8): 1593-1603.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2020.08.019    或    http://www.zjujournals.com/eng/CN/Y2020/V54/I8/1593

图 1  竹节桩与桩芯土整体模型图
图 2  第 $k$层桩土计算简图
图 3  桩-土塞有限元模型
图 4  解析解与有限元解对比
图 5  土塞高度对速度时域响应的影响
图 6  水泥土剪切波速对速度时域响应的影响
图 7  阻尼系数常数对速度时域响应的影响
图 8  虚土桩尺寸系数对速度时域响应的影响
图 9  试验用土和刚拌制的水泥土
图 10  弯曲元测试水泥土剪切波速
图 11  典型波速测试曲线
图 12  水泥土试样压缩试验
图 13  不同龄期水泥土切变模量
图 14  竹节桩桩芯土现场试验
图 15  竹节桩水泥土动力响应曲线现场测试结果
图 16  无土塞竹节桩实测与拟合曲线
图 17  各龄期桩顶速度时域响应实测与拟合曲线
图 18  各龄期下理论模型的拟合参数
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