Abstract: Rockburst is a kind of surrounding rock failure mode in deep underground engineering, and the occurrence conditions of rockburst are restricted. According to the statistical result of rockburst in Jinping II deep-buried tunnel, even if stress conditon and rockmass strength achieve a certain requirements, the intensity of rock burst is still closely related with rockmass mechanical characteristics. Marble is given priority to Jinping deep buried tunnel, so research works about the marble mechanical characteristic in relation to rockburst are carried out. According to the marble triaxial compression test result, the brittle-ductile-plastic transition characteristic of marbe is verified, and the transition confining pressure and the related Hoek-Brown strength parameters of Baishan group are determined. Adopting the experience method, the rock is evaluated burst risk preliminarily. In order to further study the influence of rockmass mechanics characteristics on rockburst risk, based on the actual rockburst failure pattern, the stress paths of different depths measuring point are investigated, and the mechanical parameters of rock mass are checked. The mechanical state of surrounding rock in rockburst risk is analyzed, and study the influences of rock strength, integrity and brittle characteristics on the occurrence conditions of rockburst are studied. The results show that the rock strength and brittle characteristics can affect the degree of rockburst, but its influence is relatively small, while the integrity of rock mass has the obvious effect on rockburst formation.

Key words: deep-buried, marble, rockburst, stress path, brittle-ductile-plastic transition