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| 灌注桩钢筋笼外部的磁异常特征研究 | |
| 引用本文： | 董平,樊敬亮,刘朝晖,陈光伟,王良书,孙斌,蒲晓轩.灌注桩钢筋笼外部的磁异常特征研究[J].地球物理学进展,2007,22(5):1660-1665. |
| 作者姓名： | 董平 樊敬亮 刘朝晖 陈光伟 王良书 孙斌 蒲晓轩 |
| 作者单位： | 1. 南京大学地球科学系,南京,210093 2. 南京大学地球科学系,南京,210093;江苏华东建设基础工程总公司,南京,210007 3. 江苏省交通厅,南京,210004 |
| 基金项目： | 江苏省交通科学研究计划项目(05Y015)资助 |
| 摘 要： | 灌注桩中的钢筋笼在地磁场中受磁化作用而产生磁感应强度,使灌注桩附近的磁场强度发生变化.通过分析水平磁性圆柱体外部的磁异常特征,结合模型桩试验,研究了灌注桩钢筋笼外部的磁异常特征,结果表明在钢筋笼外侧钻孔中的磁异常总体上呈现"两峰夹一谷"的特征,钢筋笼中部呈宽缓的马鞍形负异常,钢筋笼底端位置对应磁异常从极小值转变为极大值的拐点.研究成果从理论上为用磁测井法检测灌注桩中钢筋笼长度奠定了基础. |
| 关 键 词： | 磁异常 钢筋笼长度 灌注桩 |
| 文章编号： | 1004-2903（2007）05-1660-06 |
| 收稿时间： | 2007-02-10 |
| 修稿时间： | 2007-06-20 |
Magnetic anomaly characteristics out of reinforcement cage in cast-in-situ pile |
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| DONG Ping,FAN Jing-liang,LIU Zhao-hui,CHEN Guang-wei,WANG Liang-shu,SUN Bin,PU Xiao-xuan.Magnetic anomaly characteristics out of reinforcement cage in cast-in-situ pile[J].Progress in Geophysics,2007,22(5):1660-1665. | |
| Authors: | DONG Ping FAN Jing-liang LIU Zhao-hui CHEN Guang-wei WANG Liang-shu SUN Bin PU Xiao-xuan |
| Institution: | Department of Earth Sciences, Nanjing University, Nanjing 210093, China ; J iangsu East China Construction Engineering Corporation, Nanjing 210007, China ; J iangsu Communication Department, Nanjing 210004, China |
| Abstract: | Steel bars in cast-in-situ pile will be magnetized under the excitation of geomagnetic field,which changes the magnetic field around pile.Based on the magnetic anomaly characteristics out of a horizontal cylinder and the results of model piles test,the magnetic anomaly characteristics out of reinforcement cage in cast-in-situ pile were analyzed.The analysis results indicate that the magnetic anomaly curve along the borehole depth out of reinforcement cage has a form of 'a valley between two peaks',on which a wide negative anomaly region like a saddle corresponds to the middle part of reinforcement cage and an inflexion from minimum to maximum corresponds to the bottom of reinforcement cage.It provides a basis for the length detection of reinforcement cage in cast-in-situ pile. |
| Keywords: | magnetic anomaly length of reinforcement cage cast-in-situ pile |
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