向莆铁路赤岭隧道燕尾段小间距施工技术

随着我国高速铁路建设的发展,在施工中遇到隧道燕尾段的情况会越来越多,其特点是左右洞间距小、中间岩柱加固困难、后行隧道开挖对先行隧道影响大,安全质量控制难度大。向莆铁路赤岭隧道为燕尾式隧道,通过采用合理确定左右线的施工顺序和滞后距离、设对拉锚杆对中岩墙进行加固、严格控制开挖进尺和爆破效果等措施,安全顺利通过了小间距段。

Short-Spaced Construction Techniques for the Red Mountain Swallow-Tailed-Type Tunnel of the Xiang-Pu Railway

With the rapid development of the high-speed railway in our country,more and more swallow-tailed-type sections are faced with in the construction of tunnels,the characteristics of which are that the space between the right and left cavities is small,the strengthening of the mid-rock columns is difficult,the excavation of the following tunnel has a great effect on the advancing tunnel,and the safety and quality control is very difficult.The Red Mountain Tunnel of the Xiang-Pu Railway is a swallow-tailed-type tunnel.However,the excavation of the tunnel is safely and smoothly performed in the short-spaced sections of the tunnel only because some corresponding measures,such as reasonably choosing the right sequences of construction processes and lagging distances,providing opposite-pulling anchor bars to strengthen the mid-rock wall,and strictly control the drilling footage and the blasting effects,etc.,are adopted.