摘要
非金属管线探测一直被业内认为是管线探测的难题,其中部分浅埋非金属管线还可以利用示踪法、地质雷达等特殊方法得到其大概位置及埋深,而对于深埋预制混凝土管道则是束手无策。为了解决深埋预制混凝土管道的探测问题,现根据地球磁场对预制混凝土管道产生微弱磁化作用的原理,研究其磁梯度场的特征,分析不同磁方位角混凝土管道磁梯度场的形态及管道两侧的磁梯度异常曲线,然后利用高精度孔中磁力仪捕捉其微弱磁异常信号,最后精确判断管线的位置与埋深。经实际验证,在深埋预制混凝土管道探测方面,该磁梯度技术是一种行之有效的方法。
Non-metallic pipelines have been regarded as one of the most difficult problems in the pipeline detection. For shallow buried non-metallic pipelines, the approximate position and depth of which can be obtained through the tracer method and geological radar, but for deeply buried precast concrete pipes, those methods are helpless. In order to solve the detection problem of the deeply buried precast concrete pipes, based on the principle that the precast concrete pipes can produce weak magnetization under the affection of the Earth＇ s magnetic field, the characteristics of the magnetic gra- dient field was studied. The magnetic gradient field of concrete pipes at different magnetic azimuth and the curves of the magnetic gradient anomalies on both sides were analyzed. Then, the high precision magnetometer was applied to capture the weak magnetic anomaly signal, and the accurate position and the depth of the pipes could be obtained in the end. Practical verification confirms that the magnetic gradient technique is an effective method in the detection of the precast concrete pipelines.
出处
《水利与建筑工程学报》
2016年第2期123-126,156,共5页
Journal of Water Resources and Architectural Engineering
关键词
磁梯度
深埋
预制混凝土管道
“S”型曲线
magnetic gradient
deeply buried
precast concrete pipelines
S shaped curve
