2) Arch heading method
弧形导坑法
3) parenthetic pilot tunnel
弧形导坑
1.
Taking the breakthrough construction of each working face of Hanguguan Tunnel of the passenger special line on Zhengzhou-Xi’an Railway as the example, this paper sums up the main points of the breakthrough among different excavation methods such as CRD, and parenthetic pilot tunnel, etc.
以郑西铁路客运专线函谷关隧道各工作面贯通施工为例,总结出CRD、弧形导坑等不同开挖方法间的贯通要点,指出该工法符合大断面黄土隧道施工安全、快速的要求,特别当黄土隧道断面大于160 m2时更为有效。
4) guiding hole method
导洞法
1.
In this article,transitional section is formed by vertical and horizontal guiding hole method during construction of No.
介绍北京地铁五号线区间利用纵-横导洞法形成渡线大断面,并在管线渗漏水严重、围岩极差的情况下,采用地面防护与地下辅助工法相结合的施工技术,确保了危楼、管线及暗挖结构的安全。
5) three-pilot drift method
三导洞法
1.
By means of numerical analysis, the construction process of three-pilot drift method and single-pilot drift method on geology condition of four-grade and five-grade rock mass was discussed.
应用数值分析手段，探讨了Ⅳ、Ⅴ级围岩条件下三导洞法和中导洞法施工过程中，围岩应力场和位移场的分布特征及支护结构的内力演变规律。
6) two-guiding-hole method
中导洞法
1.
According to the result,the three-guiding-hole method is more suitable for this construction because their wall-rock displacement and vertical stress are smaller and the prejudicial stress of the middle wall is lower than the two-guiding-hole method.
以张石高速公路二期工程岔道一号隧道为实例,对三导洞法和中导洞法两种施工方法进行了数值模拟,分析比较了这两种施工方法在不同施工工序下的围岩位移场、围岩竖向应力场以及中隔墙竖向应力的变化,从而得出了在相同支护条件下,采用三导洞方案进行岔道一号双连拱隧道施工时,与中导洞方案相比围岩位移值小,竖向应力和中墙所受偏压力低,因而优于中导洞方案。
补充资料：弧形
1.半圆形(包括大半圆形和小半圆形)。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条