A new modified Hoek-Brown failure criterion considering the effect of the intermediate principal stress and its applicability analysis
To consider the effect of intermediate principal stress on rock failure, the generalized Hoek-Brown criterion was modified by incorporating a new term to quantitatively account for the nonlinearity of rocks in high stress states.The failure envelope of the modified generalized as the Hock-Brown criterion in the principal stress space is a curved hexagonal pyramid which touches the three outer apices of the original Hock-Brown criterion.In the (σ1-σ3)-(σ3 + nσ2) plane, it has a nonlinear form of powerlaw curve.The comparison results with three failure criteria based on multi-axial test strength data of four rocks indicate that the new three-dimensional Hock-Brown criterion achieved the least misfit to most of the test data, followed by the Mogi (1971) criterion, whereas the Hock-Brown and the Drucker-Prager criterion have a poor performance compared to the former two criteria.The modified Hock-Brown criterion is proved to be a good candidate for prediction multi-axia strength of rocks.
L.J.Ma G.A.Wang X.Y.Liu Q.K.Yi Y.S.Wang
State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact,PLA University of Science and Technology, Nanjing, China
国际会议
The 3rd ISRM Young Scholars Symposium on Rock Mechanics(第三届国际岩石力学青年学者论坛)
北京
英文
559-564
2014-11-08（万方平台首次上网日期，不代表论文的发表时间）