Abstract: The diffusion radius of cement slurry, as an important parameter of grouting, determines the layout of grouting holes and the quantity of slurry in sand and gravel layer grouting construction. It is also an important basis for selecting techniques and estimating grouting effects. By designing orthogonal tests, we analyzed several factors which affect the diffusion radius of cement slurry including water-cement ratio, void ratio, and grouting pressure. Research results indicate that water-cement ratio is the most significant factor affecting the diffusion radius. Slurry liquidity improves with the increase of water-cement ratio and excessive water content.

Key words: sand and gravel layer, grouting, diffusion radius, laboratory test