兰渝铁路桃树坪隧道3号斜井进正洞施工技术

大断面隧道施工中,斜井进正洞衔接段施工是工程的重点和难点之一.在建的兰渝铁路桃树坪隧道位于第三系粉细砂层中,地下水位在洞顶2 m以上,为双线大断面饱和沙土隧道.以桃树坪隧道3#斜井进入正洞段施工为例,详细介绍了大断面饱和沙土隧道由斜井进入正洞施工技术,为类似工程施工提供参考.

Construction Technology of No.3 Inclined Shaft of Taoshuping Tunnel into the Main Tunnel of the Railway from Lanzhou to Chongqing

In the process of large cross-section tunnel construction,the linking-up section construction of inclined shaft into the main tunnel is one of the important difficulties of the project.Taoshuping tunnel of the railway from Lanzhou to Chongqing is located in Tertiary fine sand layer,and the groundwater level is more than 2 meters above the tunnel roof.It is a double large cross-section saturated sand tunnel.Taking the construction of No.3 inclined shaft of Taoshuping tunnel into the main tunnel as an example,the construction technology of inclined shaft into the main tunnel of the large cross-section saturated sand tunnel is described in detail,which can provide a reference for the similar project construction.