灌注桩钢筋笼内部的磁异常特征  

MAGNETIC ANOMALY CHARACTERISTICS INSIDE THE REINFORCEMENT CAGE OF THE CAST-IN-SITU PILE

作　　者：董平[1] 樊敬亮[1] 王良书[1] 潘卫育[2] 杨毅文[2] 

机构地区：[1]南京大学地球科学系,江苏南京210093 [2]江苏省交通厅,江苏南京210004

出　　处：《物探与化探》2008年第1期101-104,108,共5页Geophysical and Geochemical Exploration

基　　金：江苏省交通科学研究计划项目(05Y015)资助

摘　　要：通过分析有限长直立圆柱体内部的磁异常特征,结合模型桩试验,研究了灌注桩钢筋笼内部的磁异常特征,结果表明在钢筋笼内部钻孔中的磁异常Za垂直分量总体上呈现"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,相应梯度曲线出现极大值。Based on an analysis of magnetic anomaly characteristics inside the perpendicular cylinder and the result of model piles test, the authors studied the magnetic anomaly characteristics inside the reinforcement cage of the cast-in-situ pile. The results indicate that the magnetic anomaly curve along the borehole depth inside the reinforcement cage has the form ＂a valley between two peaks, on which a wide negative anomaly region like a saddle corresponds to the middle part of reinforcement cage＂. The bottom of the reinforcement cage corresponds both to the inflexion of the magnetic anomaly curve and to the maximum of the magnetic anomaly gradient curve.

关 键 词：灌注桩 钢筋笼 直立圆柱体 磁异常 

分 类 号：P631.2[天文地球—地质矿产勘探]