Detection method and instrument design for piping paths in earth-rock dams based on electric dipole sources
Earth-rockfill dams are common hydraulic engineering structures,where the structural characteristics of soil and rock materials inherently lead to seepage.Abnormal seepage can result in the erosion of internal soil,gradually forming piping leakage channels.If effective measures are not taken to detect and manage these piping leakage channels in advance,the dam may face risks such as settlement,landslides,or collapse.To accurately locate the position of piping leakage channels and provide richer detection data for dam management,this paper develops a leakage detection instrument based on the abnormal distribution characteristics of electrical conductivity associated with these channels.The instrument consists of a transmission system and a reception system.The transmission system is designed to induce an abnormal magnetic field in the piping leakage channels,while the reception system comprises a three-component magnetometer,a Real-Time Kinematic(RTK)positioning system,and a receiver to measure and record the amplitude of weak abnormal magnetic signals along with centimeter-level latitude and longitude information.Through simulations,laboratory tests,and field experiments,the effectiveness of the detection method and instrument has been successfully validated.This instrument and method are expected to play a crucial role in monitoring and maintaining dam safety,providing an advanced detection technology to mitigate potential disasters associated with earth-rockfill dams.
Electromagnetic detectionTri-axial search-coil magnetometerMagnetic field strength measurementEarth and rock dam piping paths detection
万方数据
维普
