Experimental Study On Rockburst Based On Interlayer Friction And Sliding

Rockburst is one of the typical dynamic disasters in coal mining.In this paper:Based on the interlaminar friction and sliding,the experimental study of rockburst were carried out,and three typical structural experiments of coal(rock)pillar,working face and roadway were designed and carried out to reduction the process of rockburst approximately.The DSCM as the experimental observation method calculate and analysis the evolution process of displacement field of surrounding rock,the evolution law of interlayer displacement,the evolution law of interface shear deformation and the distribution law of deformation energy density,and the following conclusions were drawn:Coal pillar rockburst experiment based on interlayer friction and sliding: The evolution process of deformation field of coal pillar under rock burst was analyzed,and it is found that the localization zone of coal pillar appears preferentially with weak interlayer and develops along loading direction.The relationship between the displacement difference between coal pillars and the shear deformation of interface was analyzed,and the process of breaking through the interlayer occlusion by rock slip was explained.The deformation energy of rock block in roof was analyzed,and the law of energy accumulation and release of rock block in loading process and disaster time was found.Rock burst experiment of working face based on interlayer friction and sliding: It was found that there was a "elastic core" between the elastic bearing zone and the original rock stress zone.The evolution process of the elastic deformation energy in the elastic bearing area was studied,and the fluctuation process of the deformation energy in the elastic bearing area was rising volatility.The displacement of impact rock block was analyzed,and the rock block contraction caused by rock block impact was found.The time-varying characteristics of the three load zones at the working face were proposed.Rock burst experiment of roadway based on interlayer friction and sliding: Through the analysis of the displacement between layers and the deformation field of weak interlayer,the energy storage and release process of the tunnel impact ground pressure were found,and the source of the impact energy was explored.Through the analysis of the shear deformation,it is found that after the interface sliding,it is easy to occur the compression buckling when it is pressed again.Through the dynamic impact phenomenon presented by different loads,the impact strength increases with the increase of the initial shear stress,and the acceleration first decreases and then increases from the depth to the coal wall.