Mechanical properties and permeability evolution of sandstone subjected to the coupling effects of chemical-seepage-stress

Abstract

In this study, a series of triaxial tests are conducted on sandstone specimens to investigate the evolution of their mechanics and permeability characteristics under the combined action of immersion corrosion and seepage of different chemical solutions. It is observed that with the increase of confining pressure, the peak stress, dilatancy stress, dilatancy stress ratio, peak strain, and elastic modulus of the sandstone increase while the Poisson ratio decreases and less secondary cracks are produced when the samples are broken. The pore pressure and confining pressure have opposite influences on the mechanical properties. With the increase of the applied axial stress, three stages are clearly identified in the permeability evolution curves: initial compaction stage, linear elasticity stage and plastic deformation stage. The permeability reaches the maximum value when the highest volumetric dilatancy is obtained. In addition, the hydrochemical action of salt solution with pH=7 and 4 has an obvious deteriorating effect on the mechanical properties and induces the increase of permeability. The obtained results will be useful in engineering to understand the mechanical and seepage properties of sandstone under the coupled chemical-seepage-stress multiple fields.

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