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。
In the analysis, the uncertainty of attenuation relation is considered.
在分析中，考虑了衰减关系的不确定性。
Analysis of the attenuation law of ground motion energy.
地震动能量衰减规律的统计分析。
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