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中文摘要：
探讨了采用Lambe应力路径、主应力空间及塑性评估指数分析围岩应力调整和屈服的方法，并以锦屏二级水电站引水隧洞西端绿泥石片岩段施工为依托，采用有限差分软件FLAC”模拟和分析了高地应力条件下工程软岩隧洞采用长台阶法开挖过程中围岩的应力调整特征。分析发现采用主应力空间法表示应力路径和计算塑性评估指数时同时考虑了3个主应力的影响，计算结果较采用Lambe应力路径法更为直观和准确；同时模拟结果显示，隧洞开挖过程中围岩应力调整主要集中在离掌子面1，5B的范围，且拱顶较边墙及仰拱先进入塑性状态。
英文摘要：
Analysis methods of surrounding rock stress adjustment and yield are discussed based on Lambe stress path, principal stress space and plastic assessment index. The stress adjustment characteristics of surrounding rock during tunnel excavating by long bench method in soft rock with high ground stress is investigated using finite difference software FLAC3D, relying on construction of the western section diversion tunnels with chlorite schist surrounding rock at Jinping 1I hydroelectric station. The analysis shows that （ 1 ） stress path expressed by principal stress space method and p~astic assessment index method are more intuiti,~e and accurate than using Lambe stress path method because of three principal stresses are considered; （2） stress adjustment of surrounding rock occurs mainly in the front and rear sides 1.5B away from the tunnel face in the process of excavation, and arch crown rock enters plastic state earlier than side wall and inverted arch.
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