The penetration behavior was studied of colloidal silica grout, a chemical grout for soils and rocks with low permeability, by means of laboratory injection tests and numerical analysis. The injection tests using small specimens found that flow rate was reduced for reasons unexplainable by the rise in viscosity of the grout. It was presumed that changes in rheology of the grout were attributable. The rheological measurements of the grout revealed that the grout behaved like a non-Newtonian fluid as gelling progressed. Then, a numerical analysis method was proposed by modeling the grout as a pseudoplastic fluid and a Bingham fluid. Modeling the grout as a pseudoplastic fluid led to a relatively good agreement between analysis results and measurements. Then, it was shown that the behavior of the grout as a non-Newtonian fluid affected the permeability of the grout.
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