缓倾软岩隧道底鼓设计变更优化方案  

Design Change Optimization Plan for the Floor Drum of Gently Inclined Soft Rock Tunnel

作　　者：朱科[1] ZHU Ke(China Railway 18th Bureau Group 3rd Engineering Co.Ltd.,Zhuozhou Hebei 072750,China)

机构地区：[1]中铁十八局集团第三工程有限公司,河北涿州072750

出　　处：《铁道建筑技术》2024年第8期77-79,123,共4页Railway Construction Technology

基　　金：中国铁建股份有限公司科技研究开发计划项目(2019-C21)。

摘　　要：以贵南铁路九万大山一号隧道为依托工程,结合高铁隧道缓倾软岩地层围岩物性指标试验及隧底隆起变形机理分析,从缓倾软岩隧道底鼓控制要点及控制措施出发,提出针对缓倾岩层区段底部结构隆起等相似病害采用加深仰拱、调整仰拱结构曲率、加强仰拱支护强度和刚度等变更优化设计方案,即该类围岩地段拱墙轮廓及厚度维持原设计不变,隧底结构调整仰拱曲率至1/8,仰拱厚度调整为70 cm,并加强控制爆破以减小对围岩的扰动。Based on the project of Jiuwan Dashan No.1 Tunnel of the Guiyang-Nanning High-speed Railway,and combined with the physical property index test of the surrounding rock in the gently inclined soft rock strata of the high-speed railway tunnel and the analysis of the deformation mechanism of the tunnel floor drum,this article sets out from the control points and measures of the gently inclined soft rock tunnel floor drum,and proposes a design change optimization plan of deepening the inverted arch,adjusting the curvature of the inverted arch structure,and strengthening the supporting strength and stiffness of the inverted arch for similar diseases such as the bottom structure uplift in the gently inclined soft rock strata section.The contour and thickness of the arch wall in the surrounding rock area will remain unchanged from the original design.The tunnel bottom structure will be adjusted to 1/8 of the inverted arch curvature,and the inverted arch thickness will be adjusted to 70 cm in a modified design.And the control of blasting will be strengthened to reduce disturbance to the surrounding rock.

关 键 词：缓倾软岩地层 隧道底鼓 设计变更优化 仰拱曲率 支护加强 

分 类 号：U452.2[建筑科学—桥梁与隧道工程]