Pressurized thixotropic grout material for tunnels' back filling will be consolidated and decrease their volume under drain condition. In respect to the ground deformation due to the tunneling, the consolidating behavior is a crucial factor. This paper presents empirical formulas of the consolidation for the thixotropic back-fill grout material, based on the uniaxial strength tests and the consolidation tests. The formulas have good agreement with test results of strength growth with various cement-water ratios, relation between Young's modulus and strength, and volume loss due to consolidation. Furthermore, the shape of the air-dried consolidation test's specimen can be explained by the factor of calculated time dependent distributions of strain, cement-water ratio, Young's modulus, and coefficient of permeability in specimen.

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