石林隧道斜井转正洞交叉口施工技术

隧道斜井转正洞交叉口施工中,合理的施工方案是确保施工安全和确保工期的前提。石林隧道斜井与正洞交叉口施工中,按照不同的围岩级别采用了不同的斜井进正洞方法:Ⅱ、Ⅲ级围岩宜采用全断面开挖法直接进入正洞;Ⅳ、Ⅴ级围岩采用导洞转向法,斜井施工至与正洞交界后,以圆曲线形式转体进入正洞。特别是斜井与正洞相交处,安排了详细的施工程序,确保了隧道斜井顺利进入正洞,保证了隧道施工工期和施工质量。

Construction Technique for the Intersection of the Inclined Shaft and Main Tunnel of the Shilin Tunnel

A reasonable construction scheme is the foundation of safe and smooth construction during the construction of an intersection of an inclined shaft and the main tunnel.Different methods for intersecting the inclined shaft and main tunnel are addressed with respect to surrounding rock of various classes.For surrounding rock of classes II and III,a full-face excavation should be implemented to enter directly into the main tunnel.For surrounding rock of classes IV and V,the pilot tunnel method should be used wi...