基桩完整性检测中的尺寸效应及桩身阻抗变化效应
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摘要
采用理论计算与模型试验相结合的方式,研究考虑桩身材料阻尼、桩侧土采用广义Voigt模型条件下,桩身缺陷纵向长度和桩身阻抗变化这2个因素对低应变检测结果的影响,发现模型试验与理论计算反映的规律非常吻合,桩身缺陷纵向长度尺寸会较为明显地影响桩身缺陷处的反射现象,而阻抗渐变程度的不同也会在时程曲线上有规律性地表现。理论计算与模型试验得到的结果可为实际工程中的基桩完整性检测提供指导,以减少误判风险。
Based on the combination of theoretical calculation and model test,the influence of two factors on longitudinal strain and pile impedance gradual change is studied considering the material damping of pile body and the generalized Voigt model of pile side soil. We found that the model test is in good agreement with the theoretical calculation. The longitudinal length size of the pile body defect will obviously affect the reflection phenomenon of the pile body defect and the varying degrees of the pile impedance will also behave regularly on the time history curve. The results obtained in this paper can provide guidance for the testing of pile integrity in practical engineering,in order to reduce the risk of misjudgment.
Based on the combination of theoretical calculation and model test,the influence of two factors on longitudinal strain and pile impedance gradual change is studied considering the material damping of pile body and the generalized Voigt model of pile side soil. We found that the model test is in good agreement with the theoretical calculation. The longitudinal length size of the pile body defect will obviously affect the reflection phenomenon of the pile body defect and the varying degrees of the pile impedance will also behave regularly on the time history curve. The results obtained in this paper can provide guidance for the testing of pile integrity in practical engineering,in order to reduce the risk of misjudgment.
引文
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[7]陈凡,王仁军.尺寸效应对基桩低应变完整性检测的影响[J].岩土工程学报,1998,20(5):92-96.(CHEN Fan,WANG Renjun.Effect of size effect on low strain integrity test of pile[J].Chinese Journal of Geotechnical Engineering,1998,20(5):92-96.(in Chinese))
[8]王腾,王奎华,谢康和.成层土中桩的纵向振动理论研究及应用[J].土木工程学报,2002,35(1):83-87.(WANG Kuihua,XIEKanghe,ZENG Guoxi.Theoretical study and application of longitudinal vibration of pile in layered soil[J].China Civil Engineering Journal,2002,35(1):83-87.(in Chinese))
[2]王奎华,谢康和,曾国熙.变截面阻抗桩受迫振动问题解析解及应用[J].土木工程学报,1998,31(6):56-67.(WANG Kuihua,XIEKanghe,ZENG Guoxi.Analytical solution and application of forced vibration of variable cross section impedance pile[J].China Civil Engineering Journal,1998,31(6):56-67.(in Chinese))
[3]王奎华.成层广义Voigt地基中粘弹性桩纵向振动分析与应用[J].浙江大学学报:工学版,2002,36(5):565-571.(WANG Kuihua.Analysis and application of longitudinal vibration of viscoelastic pile in layered generalized Voigt Foundation[J].Journal of Zhejiang University:Engineering Science,2002,36(5):565-571.(in Chinese))
[4]王腾,王奎华,谢康和.任意段变截面桩纵向振动半解析解及应用[J].岩土工程学报,2000,22(6):654-658.(WANG Teng,WANGKuihua,XIE Kanghe.A quasi-analytical solution to longitudinal vibration of pile with variable section and its application[J].Chinese Journal of Geotechnical Engineering,2000,22(6):654-658.(in Chinese))
[5]段军,刘东甲,程晓东,等.桩的一维纵向问题的交叉网格有限差分法数值计算[J].工程地球物理学报,2008,5(1):54-59.(DUANJun,LIU Dongjia,CHENG Xiaodong,et al.The intersection of one dimensional longitudinal problems of piles Numerical calculation of forked mesh finite difference method[J].Journal of Engineering Geophysics,2008,5(1):54-59.(in Chinese))
[6]张献民,李少波.应用低应变能量分析确定基桩缺陷程度[J].岩石力学与工程学报,2006,25(1):3 198-3 205.(ZHANG Xianming,LI Shaobo.Application of low strain energy analysis to determine the degree of pile defects[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(1):3 198-3 205.(in Chinese))
[7]陈凡,王仁军.尺寸效应对基桩低应变完整性检测的影响[J].岩土工程学报,1998,20(5):92-96.(CHEN Fan,WANG Renjun.Effect of size effect on low strain integrity test of pile[J].Chinese Journal of Geotechnical Engineering,1998,20(5):92-96.(in Chinese))
[8]王腾,王奎华,谢康和.成层土中桩的纵向振动理论研究及应用[J].土木工程学报,2002,35(1):83-87.(WANG Kuihua,XIEKanghe,ZENG Guoxi.Theoretical study and application of longitudinal vibration of pile in layered soil[J].China Civil Engineering Journal,2002,35(1):83-87.(in Chinese))