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位于京广二线衡阳至韶关段的大瑶山隧道进口平行导坑设计施工长度为3800米,一直与上崩圹斜井沟通(图一)。平导的主要作用是为正洞无轨运输,全断面开挖提供通风,排水和提前进入正洞,提前处理断层带及破碎岩质地段,借以加快正洞施工进度和确保工期。因此平导的快速掘进具有战略意义。负责该隧道口施工的隧道局一处二队
The design and construction of the parallel tunnel at Dayaoshan Tunnel in Hengyang-Shaoguan section of Jing-Guang Second Line has been designed and constructed to a length of 3,800 meters and has been in communication with the uplifted and inclined shafts (Figure 1). The main function of the flat guide is to provide ventilation, drainage and advance access to the main tunnel for full-face excavation of positive-hole and no-track transportation. The fault zone and broken rock sections are treated in advance so as to speed up the construction progress of the positive holes and ensure the construction period. Therefore, the guide of fast heading has strategic significance. In charge of the construction of the tunnel tunnel bureau a second team