According to the stress variation of fractured rock mass

the horizontal stress

vertical stress and water head pressure of mining stope were simulated by the normal load

shear load

and seepage water pressure during the mining process

respectively. In this study

the compression-shear seepage coupling experiment was conducted by using JAW-600 type shear seepage coupling testing system. Then the effects of normal load of fractured rock mass

roughness of joint

and seepage water pressure on the displacement

stress and permeability of specimens were discussed under the conditions of constant normal load (CNL) and constant normal stiffness (CNS). Besides

the influence laws of the shear displacement and dilatancy properties of fractured rock mass on shear stress

normal displacement

the hydraulic opening of joint and permeability were analyzed as well. It is shown that the hydraulic opening of fractured rock mass was promoted by shear stress and water head pressure

whereas its change was inhibited by the horizontal stress. Moreover

the hydraulic opening was divided into three phases

namely smaller or unchanged phase

increasing phase

stable phase with the change of shear displacement. It is found that the greater final stable value of hydraulic opening depended on the higher roughness of joint and the lower stiffness of fractured rock mass. In addition

the permeability firstly decreased and then increased owing to the dilatancy of fractured rock mass. The permeability increased with the increase of shear displacement and the roughness of joint surface

but decreased with the increase of normal load. Therefore

this study can provide the theoretical basis for the permeable channels

initiation and outbreak of permeability disaster evolution process in fractured rock mass.