EXPERIMENTAL INVESTIGATION ON FAILURE OF ROCK SUBJECTED TO 2D DYNAMIC-STATIC COUPLING LOADING

In order to model excavation of mine and stability of pillar induced by dynamic loading under 2D state of stress in deep mining,by way of combining 1D horizontal static loading device made by self and Instron electro-hydraulic and servo-controlled material testing machine,test for failure of red sandstone subjected to 2D static-dynamic coupling loading is performed;and the basic law and characteristics on failure of red sandstone under constant dynamic load and different horizontal static loads and different vertical loads are studied.It is indicated that the applied static stress has influence on the dynamic static coupling failure strength,elastic module and Poisson′s ratio.The results show that in the range of elasticity of rock the original fracture occurrence of rock may lag,but beyond elastic limit of rock the original fracture occurrence of rock may advance because of static stress.In addition,applied static stress influences failure pattern of rock specimen;for example,macroscopic fracture of rock specimen may occur in the direction of static stress.These theoretical and experimental gists are provided to analyze mining in deep mining and stability of pillar.