Abstract: In order to study the basic law of chemical slurry filled and reduced infiltration for weakly cemented porous media, the method of model experiment is taken to research on the permeability coefficient, porosity and compressive strength before and after grouting with different effective diameters and fineness modulus model material. The parameters of injection pump flow, slurry performance and hydrostatic pressure are controlled in the experiment, and six models are completed in all.The results show that: the grouting filling rate is between 9%-41% of each model material; and the rate gradually increases with the decrease of particle size and permeability coefficient. Permeability coefficient before and after grouting shows gradually decreasing trend with the decrease of effective diameter and fineness modulus, and the proportion of reduce increase gradually. The permeability coefficient of the model decreases significantly with the range of 84%-97% after grouting. Before grouting, the compressive strength of the model is low and close, after grouting, the compressive strength increments between 6-10 times, and the strength increments show gradually increasing trend with the decrease of effective diameter and fineness modulus.

Key words: porous media, penetration grouting, model experiments, effective diameter, fineness modulus