1. 利用回归分析预测围岩最终的变形以及二衬施作的合理时机。（4）对反分析方法进行了总结和分类，介绍了黄金分割法的原理。
The final deformation of the rock and the reasonable time of the lining construction are predicted using the regression analysis. Finally, the back analysis method is summarized and classified, and the principle of the golden section method is introduced.
2. 并通过数值模拟评价了隧道拆除临时支撑及二衬施作对结构、地层的影响；
The numerical simulation is carried out to appraise the effect of the structure and stratum in process of removing temporary support and adding second lining support.