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Triaxial wetting test of rockfill under the combination of spherical stress P and deviatoric stress Q

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Document pages: 10 pages

Abstract: Using GCTs medium-sized triaxial apparatus, the single line wetting test of rockfill materials of sandstone and slate, dolomite and granite is carried out. The test stress condition is the combination of spherical stress P and deviatoric stress Q. The experimental results show that: (1) for the wet shear strain, the effects of spherical stress P and deviatoric stress Q are equivalent, and the wet shear strain and deviatoric stress Q show a good power function relationship. (2) For the wet volume strain, the influence of deviatoric stress Q can be ignored because it is very small. The spherical stress P is the main influencing factor and shows a good power function relationship. (3) Moist zonens decrease significantly with the increase in initial water content and sample density generally, but the excessively high dry density will increase the wetting deformation. Also, the wetting strains will decrease with the increase in the saturated uniaxial compressive strength and average softening coefficient of the mother rock. Based on the test results, a wetting strain model is proposed for rockfill materials. The verification results indicate that the model satisfactorily reflects the development law of wetting deformation.

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