最后提出了最佳的黄土仰拱一次性开挖长度，并应用于黄土连拱隧道的施工。
According to the final results of analysis, a reasonable excavation length of inverted arch in one step was put forward and applied to the construction of multi-arch tunnel in loess.
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.
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.
运用计算软件ANSYS，采用围岩—结构模式，对TBM施工隧道仰拱预制块进行模拟动态施工的受力计算研究。
A simulation of dynamic forces acting on invert prefabricates in TBM construction tunnel is made with surrounding rock-structure model by using ANSYS software.
暗挖区间隧道通过采用超前探测、增设临时仰拱、袖阀管、锁脚锚管等技术措施，安全、顺利完成了北四环路和北辰桥段的施工。
By adopting some technology of advanced detection, adding temporary invert, sleeve valve pipe and lock foot bolts, the construction of the tunnel is completed safely and successfully.
暗挖区间隧道通过采用超前探测、增设临时仰拱、袖阀管、锁脚锚管等技术措施，安全、顺利完成了北四环路和北辰桥段的施工。
By adopting some technology of advanced detection, adding temporary invert, sleeve valve pipe and lock foot bolts, the construction of the tunnel is completed safely and successfully.
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