灌注桩钢筋笼内部的磁异常特征
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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.
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.
引文
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[2]建筑桩基技术规范(JG J94-94)[S].北京:中国建筑工业出版社,2003.
[3]王妙月.勘探地球物理学[M].北京:地震出版社,2003.
[4]长春地质学院磁法教研室.磁法勘探[M].北京:地质出版社,1979.
[5]成都地质学院物探系.磁法勘探[M].北京:地质出版社,1976.
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