首页|Mechanical behaviours of bedded sandstone under hydromechanical coupling
Mechanical behaviours of bedded sandstone under hydromechanical coupling
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The combination of the dipping effect and hydromechanical(H-M)coupling effect can easily lead to water inrush disasters in water-rich roadways with different dip angles in coal mines.Therefore,H-M coupling tests of bedded sandstones under identical osmotic pressure and various confining pressures were conducted.Then,the evolution curves of stress-strain,permeability and damage,macro-and mesoscopic failure characteristics were obtained.Subsequently,the mechanical behaviour was charac-terized,and finally the failure mechanism was revealed.The results showed that:(1)The failure of the sandstone with the bedding angle of 45° or 60° was the structure-dominant type,while that with the bedding angle of 0°,30° or 90° was the force-dominant type.(2)When the bedding angle was in the range of(0°,30°)or(45°,90°),the confining pressure played a dominant role in influencing the peak strength.However,within β∈(30°,45°),the bedding effect played a dominant role in the peak strength.(3)With the increase in bedding angle,the cohesion increased first,then decreased and finally increased,while the internal friction angle was the opposite.(4)When the bedding angle was 0° or 30°,the"water wedging"effect and the"bedding buckling"effect would lead to the forking or converging shear failure.When the bedding angle was 45° or 60°,the sliding friction effect would lead to the shear slipping failure.When the bedding angle was 90°,the combination of the"bedding buckling"effect and shear effect would lead to the mixed tension-shear failure.The above conclusions obtained are helpful for the prevention of water inrush disasters in water-rich roadways with different dips in coal mines.
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