Scatheless acoustic sounding was applied to detect the concrete defects in the top cover of entrance zone of the workshop at Wangfuzhou Hydropower Station. On the basis of analyses and evaluation to the results of investigation, such treatments as shotcrete and epoxy mortar to repair the concrete defects were adopted. Quality detected result indicates that the effect of treatments on concrete defects is good and it can satisfy the operation requirem
ent of the project. 