随着人们对地层对衬砌结构受力约束作用的认识，形成了以地层和结构相互作用为特点的管片设计方法。
Along with the cognition of the restriction of the formation to the segments increases, the segment design with the characteristic of the interacting of formation and structure forms.
自由变形圆环法作为盾构隧道管片衬砌设计的传统方法，其计算结果虽安全但偏于保守。
As a traditional method of shield tunnel segment designing, the free displacement ring method is safe but conservative.
主要研究内容和成果如下：（1）对盾构管片结构设计方法进行了较系统的研究。
The major contents and achievements of the study are as follows:(1) The methods for the design of the segment structures are studied systematically.
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