云桂铁路对门山隧道富水软岩大变形段掘进施工技术研究

Study on Excavation and Construction Technology for Large Deformation Section of Water-rich Soft Rock in Duimenshan Tunnel of Yungui Railway

文章结合云桂铁路对门山隧道穿越强风化软质粉砂岩地层出现的大变形问题,在现场地质调查、研究及监控量测数据分析的基础上,提出了针对性的变形控制措施。在对门山隧道施工过程中,通过选择合理的开挖方式、合理优化支护措施、采用可调整式钢拱架、设置超前导洞及超前钻孔释放应力、加大变形预留量等措施有效地控制了围岩变形。本隧道所采取的变形控制技术措施达到了有效控制软岩大变形的目标。

Combined with the large deformation problem when the Duimenshan Tunnel of Yungui Railway throughout the strong weathering soft siltstone strata, the paper puts forward the targeted deformation control measures on the basis of the analysis of the field geological survey, research and monitoring measurement data analysis. In the construction process of the Duimenshan tunnel, through the measures of selecting reasonable excavation methods, reasonably optimizing the support measures, using adjustable steel arch, setting the lead hole and the leading hole release stress, and increasing the amount of deformation reserve, the deformation of the surrounding rock is effectively controlled. The deformation control technology measures achieve the goal of effective control of soft rock deformation.