Experimetal Research On Resistivity Tomography Diagnosis Of Earth-rock Fill Dam Leakage

Based on National Natural Science Foundation project "The research of the earth-rock dam leakage wave-electric coupling Diagnostic Imaging Technology"(contract number 50779081), Earth-rock dam resistivity imaging diagnostic tests was compltered. Arranged the electrodes in different ways and different electrode gap were taked on the earth-rock dam .The several forms of cracks and leakage channels were detected in dam.Then compared the the different inversion results with the actual leaking cracks of the model and analysed the resuls. The experimental results can be a certain reference for the future in practical earth-rock dam leakage detection in the choice of detection electrode arrangement and determination of distance between electrodes and detection error evaluation. The major works and conclusions as follows:(1) According to the type of earth-rock dam seepage undermine,the earth-rock fill dam seepage model was set up,and the properties of similar materials was tested. Through the resistivity test of similar materials, draw out curves of the resistivity variation with the moisture content.(2) The model of earth-rock complex and derivation formula of the resistivity of earth-rock complex was proposed;Based on the calculation and analysis, obtained conclusions that moisture content and dry density have a greater impact on earth-rock complex ,but the ratio of the earth and rock was less affected.(3) Detected the five kinds of leakage detection models by using electrical resistivity imaging diagnostic techniques.and the inversion results can be better reflect the leakage channels and the location of the cracks.(4) According to analysis of three kinds of electrode arrangement of the dipole array, differential arrangement, Wenner ordered arrangement,we can conclude, three kinds of detections can reflect the location and scope of the leakage-channel,but which Wenner array to diagnose the best.(5) According to analysis of the diagnostic results of leakage-channel with different pore, reached the size of the leakage channel pore impact leakage of wate, thus affected the flooding area, and flooding area impact ed the probe effect more apparent.(6) According to analysis of the different depths leakage-channel diagnostic results, we can conclude that the depth impact on the results obvious,witch shallow measurement data are more and the inversion results were good to be closer to the actual situation,and the deep exploration data were insufficient and the boundary data had a greater impact on the results and poor accuracy.(7) According to analysis of the different isolated number results, we can conclude that isolated number had a great impact on diagnostic results, the isolated number was smaller, the precision was higher, whereas the opposite...