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本文通过模型试验,研究均质围岩处于一般三轴应力下圆形巷道的破坏形式和破坏准则。结果表明当σ_1平行巷道轴时围岩最为稳定,当σ_1和σ_2垂直轴线时,随σ_1的增大,出现横向剪切破坏;而当σ_1垂直轴线,而σ_2平行轴线时可能出现拉伸、剪切、拉剪三种形式的破坏。根据本文的结论,可以预估在已知现场围岩应力下的巷道破坏形式,或在出现破坏时估计其应力状态。这对正确选择支护方式是十分重要的。
In this paper, by means of model tests, the failure modes and failure criteria of a homogeneous tunnel under a general triaxial stress are studied. The results show that the rock mass is the most stable when σ_1 is parallel to the roadway axis. When σ_1 and σ_2 are perpendicular to the axis, transverse shear failure occurs along with the increase of σ_1. When the vertical axis of σ_1 and the parallel axis of σ_2, Cut, cut the three forms of destruction. According to the conclusion of this paper, it is possible to predict the form of roadway destruction under the known surrounding rock stress or to estimate the stress state in the event of failure. This is the right way to choose support is very important.