However, because the filling material of interlayer is not easy to wash clean, the grouting effect is often not ideal. There are also some projects using the method of backfilling concrete, the interlayer is closed under the dam foundation, if all the excavation, not only expensive, but also difficult. Therefore, a corridor was excavated along the direction of the pumping line of the dam in the adhesive interlayer, and the top and bottom of the corridor were embedded in the limestone. Through the corridor, the clay interlayer is consolidated grouted first, and then the corridor is filled with concrete to seal the clay interlayer after consolidated grouting in the bedrock.