The latest experimental results of rock creep were used: the third invariant of deviator stress tensor had greater effec文中应用了课题组近期岩石流变实验研究的结果：应力偏量第三不变量对岩石蠕变影响显著；岩石侧向蠕变的应力阀值比轴向蠕变应力阀值低20%~40%。