Progressive failure mechanical behaviour and response characteristics of sandstone under stress-seepage coupling

Abstract Conventional triaxial loading tests with different confining pressures and stress-seepage coupling on sandstone seepage were conducted. A permeability model considering strength strain was established, which better characterized the progressive deformation mechanical behaviour of under coupling. The results showed following. (i) pressure not only affects peak but also axial conventional conditions. (ii) Compared effect, degree effect weaker, that axial, radial volumetric deformations stronger (iii) With increasing pressure, decreased, while corresponding strains progressively evolution characteristics identical pressures. continuously characteristic first then decreasing (iv) law weaker research conclusions could enrich theories for prevention control water inrush accidents in coal mines.