1. Install diversion pipes.
2. Use water-swelling materials, compaction grouting, polyurethane grouting, or other methods for leak sealing.
3. Cast the retaining wall with rapid-hardening and early-strength concrete.
4. Add high-pressure jet grouting or cement-soil mixing pile water cut-off curtains on the outer wall of the foundation pit.
5. Add dewatering and drainage facilities inside the pit.