Besed on size effect,study on size effect of surrounding rock plastic deformation. Through theoretical analysis,to determine the key influencing factors of size effect on large cross section tunnel surrounding rock plastic deformation,in order to better understand the structure sta-bility of large cross section tunnel.%基于尺寸效应，对围岩塑性变形尺寸效应进行了研究，通过理论分析，确定了大断面隧道围岩塑性变形尺寸效应的关键影响因素，以更好的了解大断面隧道的结构稳定性。
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