文中采用陈至达(1962年)的光测应力分析基本方程，并导出适合于光弹性数据处理的三次样条函数。
Basic equation of photoelastic stress analysis by Chen (1962) is adopted; and a cubic spline function suitable for processing of photoelastic data is derived.
基于陈至达提出的大变形问题基础理论，指出了以传统小变形理论研究软弱围岩隧道大变形问题存在的弊端。
Based on the basic principle of large deformation body put forward by Chen Zhida, it is unreasonable to study large deformation tunnel with small deformation theory.
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