结合包家山隧道的施工情况，利用数值模拟和现场试验两种方法，对设置变形缝和不设置变形缝两种工况下衬砌结构的受力、变形及安全性进行了对比分析。研究认为：a. 无论设置变形缝与否，隧道纵向的安全性要求均能满足。b. 对于隧道结构的横向安全性，不设置变形缝时，Ⅴ级围岩端的安全系数增加，Ⅳ级围岩端的安全系数减小，此时需要进行配筋；设置变形缝时，Ⅳ级和Ⅴ级围岩处的拱顶安全系数均较小，不能满足安全要求，此时需要进行配筋。

Based on the construction of Baojiashan tunnel,the authors used numerical simulation and field test to analyze lining force,deformation and safety in the conditions of setting deformation joint and not. Studies suggest that:a. whether deformation joint is set or not,tunnel's vertical safety can meet the security requirements;b. if we do not set deformation joint for tunnel structure of the horizontal safety,the safety factor increases in V grade rock side,decreases in IV class rock side and reinforcement is needed at this time; when deformation joint is set,IV and V grade-level department of dome rock safety factors are smaller and can not meet the safety requirements,then reinforcement is needed.