北京鹰山特大断面隧道开挖技术

Technology of Excavating the Yingshan Mountain Tunnels in superlarge Scale,Bejing

摘要:

北京鹰山隧道断面特大，埋深特浅，采用正台阶弧形导坑施工法开挖，效率及成本均优。采取的技术措施为：以新奥法施工原则为指导；上台阶开挖留核心土；下台阶实行马口开挖；加宽加高开挖断面；加固拱脚锚杆等。

Abstract:

The cross section of Beijing Yingshan Mountain tunnel is superlarge scale supershallow overburden,by using of positive step are guiding adit excavation on method are both satisfactory in effect and cost.the measures are using New Austrian New Austrian Method Principle as the guide;Medium part soil is left for supporting in upperstep excavation,double pilot hole excavation is conducted at lower step the excavation surface is widened and heightened and fixed by anchor rod,etc.