新吉坪隧道斜井进正洞挑顶施工技术研究

Research on Roof Construction Technology of Inclined Shaft Crossing Main Line in Xinjiping Tunnel

沪昆铁路客运专线新吉坪隧道所处地质条件复杂,区域地质作用剧烈,碳酸岩分布广泛,不良地质特别发育。针对斜井进正洞施工,提出了纵向爬坡导坑法。并以2#斜井为例,介绍了纵向爬坡导坑法施工工艺和斜井进正洞挑顶施工的控制要点,以及在施工过程中的控制量测方法,为新吉坪隧道斜井进正洞挑顶施工提供了技术指导,为类似工程施工提供参考。

Xinjiping tunnel is located in the complicated geological conditions and has complicated geolog- ical conditions, with widely distributed carbonatite and well developed unfavorable geology. According to the construction of inclined shaft into main tunnel, the longitudinal gradient climbing drift method is proposed. Tak- ing the NO. 2 inclined shaft as an example, the construction craft and control points and the measurement method are introduced for the roof brushing construction , which provides technological guidance to inclined shaft of Xin-jiping tunnel crossing main tunnel and supplies reference to the other similar projects.