偏压浅埋大断面隧道进洞施工技术研究——以黄祁宝隧道出口段为例

Research on Construction Technology for Entering Large Section Tunnel with Biased Pressure and Shallow Burial—Taking the Exit Section of Huangqibao Tunnel as an Example

隧道穿越偏压地形与破碎岩层的情况非常普遍,在洞口段隧道容易形成浅埋的情况,遇偏压地形且隧道多为大断面时,隧道掘进施工及运营安全将受到极大影响。以某高速铁路偏压浅埋大断面隧道进洞技术为例,利用文献研究、比较分析、实践总结等方法,将洞外、洞内整体考虑,研究偏压浅埋大断面隧道进洞施工的偏压处理技术、超前预支护技术、掘进工法及初期支护技术等内容,实现复杂条件下隧道安全进洞施工。

It is very common for tunnels to pass through uneven terrain and fractured rock layers,and shallow burial is prone to occur in the tunnel entrance section.When encountering uneven terrain and the tunnel is mostly of large cross-section,the safety of tunnel excavation construction and operation will be greatly affected.The article takes the entry technology of a certain high-speed railway's biased shallow buried large section tunnel as an example,and uses methods such as literature research,comparative analysis,and practical summary to consider the overall outside and inside of the tunnel.The article studies the biased pressure treatment technology,advanced pre support technology,excavation method,and initial support technology for the entry construction of biased shallow buried large section tunnels,achieving safe tunnel entry construction under complex conditions.