Research on Experiment of Stressing Dilatancy of Rock Mass and Constitutive Progress

The experiments and constitutive formulation of the stressing dilatancy of rock mass are analyzed systematically.Some conclusions have been drawn as follows: the effects of stress on rock mass expansion are described by using the definitions such as pre-peak dilatancy and post-peak bulking;the dilatancy could occur under loading and unloading,but the dilatancy in the latter is larger than that in the former;and the effects of dilatancy are highly suppressed by the confining pressure or intermediate principal stress;also,the derivation of constitutive equation must involve the non-associated flow rule and dilatancy property.Besides, the problems existed in actual researches are also noticed,and the importance of the research on dilatancy are emphasized at last.