Modelling of change in permeability induced by dilatancy for brittle geomaterials

Abstract

The safety and durability of concrete structures are significantly affected by cracking. This structural disorder provides a preferential path for the penetration of fluids and may accelerate the material deterioration. This study investigates the mechanical damage and permeability interactions in geomaterials subjected to compressive stress inducing cracking. The development reported here is implemented within an elasto-plastic damage model able to compute plastic dilatancy. The model assumes an initial isotropic permeability tensor which becomes anisotropic with non-isotropic expansion. The model capabilities are highlighted by simulating uniaxial and triaxial compression tests. The simulation results are compared with experimental data.

Evaluation of elastoplastic properties of brittle sandstone at microscale using micro‐indentation test and simulation

“…The correlations between indentation parameters and the elastic modulus of different kinds of rock have been developed based on the experimental results 28,29 . Besides, many scientific efforts have been made to simulate the quasi‐static indentation processes of rock combining FEM, 30 displacement discontinuity method (DDM), 31 or discrete element modeling (DEM) 32 with different constitutive law of rock, for example, the linear Mohr‐Coulomb, Drucker‐Prager, and damage model 33,34 . However, the indenter size adopted in these studies is in the millimeter scale, in which case the rock samples is assumed as intact, isotropic, and homogeneous.…”