Transient electromagnetic 3D numerical simulation and application of underground pipeline leakage
Road collapse accidents are a key safety issue that urgently needs to be solved in the development of urbanization,and underground pipeline leakage is one of the main causes of road collapse.In order to study the transient electromagnetic response changes caused by underground pipeline leakage,this paper establishes pipeline models with different burial depths,pipe diameters,and lengths,and sets up multi angle measurement line layout to simulate the process of underground pipeline leakage causing voids and ground collapse;Through numerical simulation,it is obtained that:(1)Under a certain pipeline diameter,length,and burial depth,the abnormal form of apparent resistivity is an"eight"shaped low resistance symmetrical with the pipeline position as the center point;(2)The change in the angle between the measuring line and the pipeline will affect the abnormal form of apparent resistivity;(3)The abnormal form of apparent resistivity will not change with the distance between the measuring line and the center point of the pipeline;(4)The cavity anomaly caused by water seepage in underground pipelines still includes pipeline anomalies.After analyzing the measured data in a certain area,it was found that the apparent resistivity of the pipeline exhibits a symmetrical low resistance trap,which is consistent with the conclusions of numerical simulation.From this,the pipeline position and leakage area can be more accurately identified on the survey line profile,and it has been proven that transient electromagnetic detection has a good effect in detecting underground pipeline leakage cavities.This work provides a theoretical basis for detecting road collapse caused by underground pipeline leakage and provides theoretical guidance for practical applications.
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