Abstract: As an academic report，the paper states the research achievements in the past and is composed of the relevant papers by the writer，including the theory of FEM limit analysis，the failure mechanism of tunnel，criteria of dividing deepburied and shallow-buried tunnels，stability analysis of tunnel surrounding rock without lining as well as the design and calculation methods of tunnels with preliminary and secondary lining，which can be references for the specialists in this field．

Key words: the failure mechanism of tunnel, loess tunnel, FEM strength reduction, safety factor of shear, failure surface; stability analysis

摘要： 作为一个学术报告对以往研究成果做一个综述，内容包括有限元极限分析法原理、隧洞的破坏机理、隧洞深、浅埋分 界标准，无衬砌隧洞围岩的定量稳定性分析质以及有衬砌隧洞时隧洞初衬与二衬的设计计算方法，以供同行们参考。

关键词: 隧洞破坏机理, 黄土隧洞, 有限元强度折减法, 剪切安全系数, 破裂面, 稳定分析