Gas permeability change with deformation and cracking of a sandstone under triaxial compression

In this study, a thermal–hydraulic–mechanical–chemical (THMC) multi-field coupling triaxial cell was used to study systematically the evolution of gas permeability and deformation characteristics sandstone. The effects confining, axial pressure on were fully considered in test. sandstone decreases with increasing confining pressure. When is low, variation greater than that at high injection significantly affects As increases, tends decrease. At same pressure, sample during unloading path less loading path. applied, it has significant influence 30 MPa, influences pressures as increases. Finally, micro-pore/fracture structure after test observed using 3D X-ray CT imaging.