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Three-dimensional anisotropic swelling model for clay shale —a fabric approach

1997; Elsevier BV; Volume: 34; Issue: 2 Linguagem: Inglês

10.1016/s0148-9062(96)00057-5

1873-4545

R.C.K. Wong, E.Z. Wang,

Rock Mechanics and Modeling

A three-dimensional model is developed to quantify the anisotropic swelling behaviour of geological materials. The model considers clay mineral particle swelling, fabric anisotropy and induced stress anisotropy as important fundamentals. The double layer theory is used to describe the relationship between the interactive particle stress and the swelling strain. Continuous functions are introduced to represent the fabric density and the particle stress distributions and to permit continuum analyses of three-dimensional swelling problems. The performance of the model has been evaluated against the experimental data obtained from swell tests on a clay soil and two clay shales. It is found that the model provides reasonable predictions on the swelling behaviour of high-density clay shale in which the swelling is dominated by the microstructural particle swelling rather than the macrostructural matrix deformation.