基于时移 3D 高密度电法的堤坝涵管接触渗漏探测研究.

The contact erosion damage of dam culvert is one of the most common dangerous conditions in dam engineering, which has the characteristics of difficult to detect, sudden damage and great harm. In order to realize the effective detection of the joint part of dam culvert and soil, the time-lapse 3D high density resistivity method was used to detect and judge the contact leakage. Based on the discussion of forward modeling, inversion theory and observation device types of time-lapse 3D high-density resistivity method, combined with the practical application of engineering, the continuous 3D resistivity detection test before and after water injection was carried out, and the resistivity reflection coefficient R was introduced to analyze the development and change law of the resistivity change at the junction in different times before and after water injection. The test results show that there is a good corresponding relationship between the low-resistivity abnormal response and the loose and non-dense area of the joint, which can realize the effective detection of the contact leakage of the joint. [ABSTRACT FROM AUTHOR]