近间距并行管线探测方法分析

The Analysis of Detection Method for the Parallel Pipeline with Close Distance

近间距并行管线探测是管线探测过程中常遇到的一大难题。本文通过正演理论曲线分析磁场水平分量Hx随管线间距与埋深比值的变化呈现出的异常特性。然后对不同激发方式的特点和不同接收方式的分辨率进行了分析研究得到:对于近间距并行管线尽可能采用直接法或夹钳法进行探测;而在采用感应法时,发射线圈水平放置也可以很大程度地压制旁线的干扰,而"梯度法"比较有利于管线定位,"水平分量法"比较有利于管线定深,最后通过工程实例进行验证。

The detection of parallel pipeline with close distance is a trouble in the process of pipeline detection.In this paper,through the forward theoretical curve analysis,the abnormal features of horizontal component Hxin magnetic field changing with the ratio of line spacing and the buried depth is studied.Then the characteristics of different stimulating way and the distinguishability of different reception are analyzed and a conclusion is drawn.The detection of parallel pipeline with close distance should adopt direct detection method or clamp method;and when induction method is adopted,the horizontal placement of transmitter coil can suppress greatly the interference of near line.The gradient method is advantageous to locate the pipeline,and horizontal component method is conducive to pipeline depth,which will be validated by an engineering example finally.