Grouting reinforcement is suitable for foundation reinforcement in sandy soil, silt soil, clay soil, and artificial fill soil.

Prior to grouting reinforcement design, it is advisable to conduct indoor slurry ratio tests and on-site grouting tests to determine design parameters and inspect construction methods and equipment; when regional experience is available, design parameters can be determined based on such experience.

Design for grouting reinforcement shall comply with the following provisions:

1. For soil reinforcement with grouting slurry, a suspension liquid with cement as the main agent or a two-liquid mixture of cement and water glass can be chosen. For anti-seepage and leak plugging grouting, water glass, a mixture of water glass and cement, or chemical slurry can be used, but chemical slurries that pollute the environment should be avoided. For reinforcing soil layers with groundwater flow, single-liquid cement slurry is not recommended; instead, use two-liquid grouting or a fast-setting alternative with a short initial setting time. Compaction grouting can utilize low-slump cement mortar and should be equipped with drainage channels.

The spacing of grouting holes should be determined based on on-site tests, ideally between 1.2m to 2.0m; grouting holes can be arranged on the inner or outer side of the foundation, or within the foundation. After grouting within the foundation, measures should be taken to seal the holes.

3 The initial setting time of the slurry should be determined based on the soil condition of the foundation and the purpose of grouting. For sandy soil foundations, it is recommended to be between 5 minutes to 20 minutes, and for clayey soil foundations, between 1 hour to 2 hours.

4 The initial design of the injection volume and effective range can be determined based on empirical formulas.