Theoretical analysis shows that the progressive failure of the surrounding rock of opening is mainly caused by strength attenuation and creep mass.
理论分析说明，巷道围岩的渐进破坏主要是岩体强度衰减和蠕变性质影响的结果。
The method can estimate the effects of the progressive failure, no-tension and dilation of rock mass.
由此可有效地处理岩石的软化、膨胀、不抗拉等特性。
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