Experimental study of deep depth tunnel surrounding rock rockburst proneness with equivalent material simulating method based on digital speckle correlation technique

Used equivalent material simulating experimental method,with the help of digital speckle correlation technique,researched the surrounding rock stress evolutive characters and law of deformation and failure during the excavation of deep rock roadway,revealed the deep rock surrounding rock stability control mechanism.Analysed the regularities of rock burst and surrounding rock failure considering the excavation speed and support pattern,seeked the internal relations between rock burst and surrounding rock deformation and failure in deep depth tunnel.Obtianed the following rules from the experimental results with excavation speed accelerated,the surrounding rock deformation plastic zone gradually expanding,deep stone drift rock burst tendency and damage level is gradually increasing;weak rock bolt support has some control function on surrounding rock deformation,strong anchor nets supporting has obvious effect on the surrounding rock,supporting strength improves,deep rock's resistance to plastic deformation ability increases,overall deformation decreases,stability of surrounding rock increases.