针对TBM施工隧道仰拱预制块的特殊结构，采用围岩-结构模式，进行了模拟施工动态的受力影响计算分析。
According to the special structure of precast block of inverted arch for TBM construction tunnel, the dynamic construction state is modeled by FEM with surrounding rock - structure calculating model.
结果表明：突水位置发生在仰拱或墙脚位置时，对衬砌结构的受力影响显著；
The results show that mechanical behavior of lining structure change evidently when suddenly effluent water happen at inverted arch or foot of wall.
为此，自行设计制造成本低、结构简单、移动快捷、轻便的片式仰拱栈桥在隧道施工现场愈来愈普遍。
To this end, sheet-type invert trestle of low cost, simple structure, convenient mobility and light weight is becoming increasingly popular at tunnelling.
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