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为了能够准确探测地下铁质管线,利用多物理场有限元软件Comsol建立了铁质管线的磁异常响应的三维数值模拟模型,将均匀磁化球体模型的数值解与解析解进行对比,验证了计算程序的准确性,分析了管道的相对磁导率、长度、外径和走向对磁异常信号的影响规律.由模拟结果可知,管道的相对磁导率和外径与磁异常信号的幅值呈正相关,不影响其基本波形;当管道长度较长时,中间段磁异常变化很小;当管道长度较短时,中间段磁异常变化剧烈;管道走向可严重影响管道磁异常信号的幅值和波形.管道端点处具有较大的正磁异常或负磁异常,可通过连接两端磁异常的顶点和谷点,确定管道走向.通过模型检验,表明化极处理可以有效识别管道的埋深和平面位置.
In order to accurately detect the underground pipeline, a three-dimensional numerical simulation model of the magnetic anomalous response of the iron pipeline was established by using multi-physics finite element software Comsol. The numerical solution and the analytical solution of the uniform magnetization spherical model were compared. The relative law of permeability, length, outside diameter and direction of pipeline influence on magnetic anomaly signal is analyzed.The simulation results show that the relative permeability and diameter of pipeline have a positive correlation with the magnitude of magnetic anomaly signal , Does not affect the basic waveform; when the length of the pipeline is longer, the magnetic anomaly change of the middle section is very small; when the pipeline length is short, the magnetic anomaly of the middle section changes drastically; the pipeline heading can seriously affect the amplitude and waveform of the magnetic anomaly signal The pipe end has a large positive anomaly or negative anomaly, which can be determined by connecting the apexes and valleys of magnetic anomalies at both ends of the pipe.The model test shows that the chemical process can effectively identify the depth and plane of the pipe position.