Treatment of near horizontal bedding plane, shearing broken zone, etc. : remove and clean up the weak filling material. If necessary, use ultra-high pressure (> 20MPa) water sprayer for cleaning, and then backfill concrete. The slope of the backfill concrete surface should be consistent with the foundation surface, and the formwork should be assembled on the steep surface to ensure the compaction of concrete. The concrete surface should be punched or chiseled.