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某线××以南两座越岭隧道甲、乙分别长为:5592、4522米。山体埋藏均较深。该两隧道为适应加快施工进度、增加工作面需要,除设计平行导坑外,并选定了斜井位置。斜井由于全线通车日期推迟,并因斜井过长而放弃。两座长隧道均采用平行导坑作为辅助坑道施工。施工方法为下导坑漏斗棚架蘑菇形开挖。解放后,平行导坑相继用于我国长隧道施工已有多座。在施工实践中,显示出比其他辅助坑道独特的优越作用。但是有关这方面的经验,有系统的报道还不多。其中有关技术条件的选择,也还存在着一些不同的看法,需要进一步
Two lines south of a certain line xxianling tunnel A, B, respectively, length: 5592,4522 meters. The mountain is buried deep. In order to speed up the construction progress and increase the working face requirements, the two tunnels have been designed with the exception of parallel guide pits and the location of inclined shafts. Inclined shaft due to the opening of the entire postponed, and due to long shaft and give up. Two long tunnels are used as a pilot excavation parallel pit construction. Construction method for the lower lead funnel scaffolding mushroom-shaped excavation. After the liberation, parallel pilots have been used for long tunnel construction in our country. In construction practice, it shows a unique superiority over other auxiliary tunnels. However, there are not many systematic reports on this experience. Among them, the choice of technical conditions, there are still some different views, you need to further