Numerical simulation of parallel pipeline in mining areas based on magnetic anomaly

In order to detect underground parallel pipeline accurately and efficiently,the authors used the magnetic dipole method to simulate underground parallel iron pipeline model,chose MATLAB to calculate the magnetic anomaly curve generated by the model,and analyzed changes of the magnetic anomaly curve caused mainly by the basic shape and the number of peaks.Numerical simulation re-sults show that the amplitude and magnetic width of magnetic anomaly signal are both affected by the selected parameters.Specifically, the center distance,depth and susceptibility all significantly change the basic curve shape as well as the number of curve peaks;the length,diameter and thickness affect the amplitude,but do not change the basic shape;with the same parameters,the calculated magnet-ic anomaly curves respectively from the COMSOL software and the magnetic dipole method have the same normalization shape,which shows that the demagnetization affects the curve amplitude of magnetic anomaly,thus proving the validity of magnetic dipole method in the parallel pipeline model forward analysis.