Mechanism Study and Tendency Judgement of Rockburst in Deep-Buried Underground Engineering

Rockburst is a type of dynamic instability failure phenomenon and frequently brings huge losses to underground engineering projects such as mines tunnels. In order explore rockburst mechanisms predict rockbursts better, relying on the background Wulaofeng deep-buried highway tunnel, in situ stress measurement was performed using new wireless devices, mechanics tests surrounding rock samples taken from different burial depths were carried out. The mechanism explored microscopic perspective based analysis scanning electron microscopy (SEM). tendency judged comprehensively by analysis, grade prediction numerical simulation. result showed that mechanical parameters granite rocks section larger than those entrance section, fractured morphology mainly comprised sheet monolithic block, corresponding transgranular fracture intergranular fracture. Rocks with few types mineral cementation, good crystallization small particle size differences had better energy storage release characteristics. There little difference buried depths, but there obvious grade. moderate–heavy level risk at vault right spandrel cross more severe, which basically consistent situation tunnel site. This study can provide theoretical basis for prevention control other similar projects.