Rock Burst Mechanism In High In-situ Stress And Rock Burst Criterion In Deep Underground Engineering

Recent years, because of more and more underground engineering in high in-situstress area, rock-burst has been a inevitable geological disaster in the process ofconstructing underground chamber. Rock-burst causes a massive loss to constructorsand equipments, the forecast and prevention of rock-burst have already been therecognized global challenge. The mechanism of rock-burst is so complex that it hasno one unitive and authoritative explain by far, and the veracity of forecast andprevent rock-burst is also unsatisfactory. So it is eager to explore the rock-burstmechanism and new method of forecast and preventing rock-burst. It is not onlysignificant to engineering safety but also increase efficiency.In this paper, first, the deformation behavior of underground chamber surroundingrock was analysed via research literature of domestic and overseas, and then it wasconfirmed of major influencing factors. Base of engineering project, the process andtendency of rock-burst were analysed via the using of3Dimensional Distinct ElementCode method. The study has confirmed the change rule of horizontal stress andvertical stress with chamber excavating, and it has analysed the possibility of causingrock-burst in excavating chamber with different excavating rate. Finally, it has studiedthe changing process of rock-burst energy, and divided the process into three stages.They were initial energy accumulation stage, energy dissipation of different formsstage and energy transforming and releasing stage. The study has proposed a newenergy criterion and grading standard for rock-burst. In addition, it has studied therationality of two different rock-burst criterion. The paper thought that the energycriterion of rock-burst still need to improve and complete. Dissipation structure theoryhas better prospect in analyzing mechanism of rock-burst, and the scholar should putmore study work into researching rock-burst energy dissipation structure theory. Therock-burst geology disaster can be forecasted and prevented effectively with itslucubrating.