| 基桩低应变动测中"短程多次反射波"的特征研究--兼论横波在检测中的应用前景 |
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| 引用本文： | 刘煜洲,刘东甲,廖旭涛.基桩低应变动测中"短程多次反射波"的特征研究--兼论横波在检测中的应用前景[J].物探化探计算技术,2005,27(4):301-305. |
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| 作者姓名： | 刘煜洲 刘东甲 廖旭涛 |
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| 作者单位： | 合肥工业大学,资源与环境工程学院,合肥,230009 |
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| 基金项目： | 安徽省自然科学基金项目资助（03044502） |
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| 摘 要： | 短程多次反射波对基桩动测资料解释常会形成干扰，并为人们所忽视。以往国内外文献对此未见详细讨论。这里通过对解析解的理论计算与物理解释，阐明了这种干扰波的波形与强度，取决于缺陷的性质、位置、尺寸以及桩周土的剪切波速，且其不能被频域滤波所消除。因此在一定的客观条件下，这种干扰波会对资料的定性与定量解释造成困难，在实际工作中应予以注意。通过计算与实例，说明了物探资料解释的多解性问题在基桩动测中同样存在，用实测资料与理论曲线拟合法解释，可提高对资料认识的全面性，从而减小这种困难。根据文献通过理论计算说明，若测量扭转波则这种干扰将会大大减小，仅从此角度亦能说明纵横波联合检测是基桩动测的发展方向之一。
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| 关 键 词： | 桩 低应变动测 纵波 横波 短程多次反射波 |
| 文章编号： | 1001-1749(2005)04-0301-05 |
| 收稿时间： | 2004-09-02 |
| 修稿时间： | 2004年9月2日 |
A study on the characteristics of short range multi-reflection wave in foundation pile for low strain dynalmic testing |
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| LIU Yu-zhou,LIU Dong-jia,LIAO Xu-tao.A study on the characteristics of short range multi-reflection wave in foundation pile for low strain dynalmic testing[J].Computing Techniques For Geophysical and Geochemical Exploration,2005,27(4):301-305. |
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| Authors: | LIU Yu-zhou LIU Dong-jia LIAO Xu-tao |
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| Abstract: | Analysis of the dynamic testing data of pile is often hampered by short-range multi-reflection wave,which is often ignored.It hasn't been studied before in home and international reference papers.It is demonstrated by theoretical calculation of analytical solution~(1]) that the waveforms and intensity of this kind of interference wave depend on the characteristic,position,size of defect and the soil's shear vibration velocity.The interference wave is difficult to eliminate by the filtering in frequency domain.As a result,under some objective conditions,the short-range multi-reflection wave will hamper the qualitative and quantitative analysis of the dynamic testing data of pile.It should be paid attention in actual situation.It is proved by calculations and practical examples that multi-interpretation exists in analysis of the dynamic testing data of pile as well as geophysical exploration data.Total analysis of the data will be improved by matching practical data and theoretical curve,so that the difficulty will be eliminated.It is showed by theoretical calculation in paper 5],when testing torsional wave,the interference will be greatly eliminated.From this point of view,it is also testified that using both longitudinal wave and shear wave is one of the developing orientation in dynamic testing of pile. |
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| Keywords: | pile low strain dynamic testing longitudinal wave transverse wave short-range multi-reflection wave |
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