Mechanical behaviours of bedded sandstone under hydromechanical coupling  

作　　者：Junwen Zhang Zhixiang Song Lichao Zhang Shaokang Wu Shanyong Wang Yang Zhang Xukai Dong Jinxin Wang Yanbo Han Baohua Kan 

机构地区：[1]School of Energy and Mining Engineering,China University of Mining and Technology (Beijing),Beijing,100083,China [2]Jarud Banner Zhahanao'er Coal Industry Co.,Ltd.,Zhaluteqi,Inner Mongolia,029200,China [3]Priority Research Centre for Geotechnical Science & Engineering,The University of Newcastle,Callaghan,NSW 2308,Australia

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2024年第4期1245-1261,共17页岩石力学与岩土工程学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.52034009 and 51974319);the Yue Qi Distinguished Scholar Project(Grant No.2020JCB01).

摘　　要：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 characterized,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,withinβ∈(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.

关 键 词：Hydromechanical coupling Bedded sandstones Mechanical behaviour Bedding effect Failure mechanism 

分 类 号：TU45[建筑科学—岩土工程]