Damage caused by abnormal seepage is one of the major hidden defects threatening the long- term safe operation of earth-rockfill dams. However

most traditional detection methods are destructive

which can cause damage to the dam structure and also have insufficient spatial detection resolution. Based on comprehensive geophysical exploration technology

collaborative detection by surface wave method and self-potential method was carried out at a core wall rockfill dam in Africa. The detection re_ sults showed that the combined application of the surface wave method and the self-potential method was feasible in the seepage analysis of earth-rockfill dams. The surface wave method can detect the area with abnormal density in the core wall dam based on the difference in shear wave velocity

while the self-potential method can detect the abnormal seepage area of the core wall dam by measuring the filter electric field formed by seepage. The combination of the two methods can give full play to their respec_ tive advantages

and the detection results can be verified by each other. Hence the detection of abnormal seepage areas is more accurate and effective

and it has good consistency in the seepage analysis of core wall dams.