Consolidation grouting is carried out on the upstream surface of the dam to plug the loopholes and cracks, strengthen the dam body and improve the seepage resistance, thus further improving the bearing capacity and integrity of the dam body. Follow-up consolidation grouting is carried out on the downstream surface of the dam, and horizontal holes or inclined holes are formed where there is water leakage or dissolved matter escaping from the downstream dam surface, and grouting pipes are buried for grouting, so as to block the leakage channels and cavities and cracks in the dam body, reinforce the dam body, and increase the stability and erosion resistance of the dam surface. This reverse grouting technology is very suitable for arch dams and buttress dams, and can also be used for gravity dams as long as uplift pressure is removed and drainage holes are set. When using this method, it is best to have no water in front of the dam.
Re-check the joints on the dam surface. After jointing, use high-grade cement mortar, hard pre-shrinking cement mortar or high-grade cement mortar prepared with waterproof materials to jointing, so as to improve the anti-leakage ability of dam surface and the stability, integrity, frost resistance and wind and wave erosion resistance of dam body.