叙毕铁路新高坡隧道大变形控制技术研究

Research on Large Deformation Control Technology of Xingaopo Tunnel on Xuyong-Bijie Railway

新高坡隧道作为穿过大量软岩的深埋隧道,伴随着高地应力和富水条件产生了大变形。这种隧道围岩变形量大,而且位移速度也很大,一般可以达到数十厘米到数米,如果不支护或支护不当,收敛的最终趋势是隧道将被完全封死。新高坡隧道大变形危害巨大,严重影响施工工期或者线路正常运营,影响了工程质量,制约了工期。因此,加强对软弱围岩大变形的控制至关重要,文章通过分析叙毕铁路新高坡隧道大变形,探索铁路隧道软岩大变形控制技术设计原则和施工控制技术的具体应用,为提升工程质量提供建议。

Xingaopo tunnel is a deep-buried tunnel passing through a large amount of soft rock with high in-situ stress and abundant water,which will cause large deformation.The surrounding rock deformation of this kind of tunnel is large,and the displacement speed is also very large,generally reaching tens of centimeters to several meters.If there is no support or improper support,the final convergence trend is that the tunnel will be completely blocked.The large deformation of Xingaopo tunnel does great harm,seriously affecting the construction period or the normal operation of the line,affecting the project quality and restricting the construction period.Therefore,it is very important to strengthen the control of large deformation of weak surrounding rock.This paper analyzes the large deformation of Xingaopo Tunnel on Xuyong-Bijie railway,explores the design principles of large deformation control technology for soft rock of railway tunnels and the specific application of construction control technology.