The Chinese Journal of Nonferrous Metals
JOURNAL OF RAILWAY SCIENCE AND ENGINEERING
|第13卷 第11期 总第80期 2016年11月|
(江苏建筑职业技术学院 能源与交通学院,江苏 徐州 221006)
摘 要: 为揭示新建隧道正交下穿施工对既有隧道结构安全及地表建筑物产生的影响,依托某新建地铁区间隧道工程,采用三维有限差分方法构建新建隧道正交下穿既有隧道数值计算模型,探讨新旧隧道垂直净距和新建隧道水平间距对既有隧道结构变形及地表沉降规律的影响,得出新建隧道正交下穿施工的合理位置。研究结果表明:适当增加新旧隧道垂直净距、新建隧道水平间距都可以有效的控制地表及既有隧道沉降值,但综合考虑隧道施工及运营成本等各方面因素,建议新旧隧道垂直净距应控制在6~10 m之间,新建隧道水平间距应大于2D。否则,需要采用注浆加固隧道周围土体等辅助措施,以确保既有隧道结构的安全及新建隧道的顺利施工。其研究成果对类似新建隧道正交下穿施工具有良好的工程实践价值。
（Jiangsu Vocational Institute of Architectural Technology, Xuzhou 221006, China）
Abstract:In order to reveal the influence of the construction of the new tunnel on the safety of the existing tunnel structure and surface buildings. Based on a new subway tunnel project, a three-dimensional finite difference method was used to construct the three-dimensional numerical model of the perpendicularly undercrossing tunneling construction on the existing tunnel. The influence of the vertical distance between the new and existing tunnels on the deformation of the existing tunnel structure and the law of the surface subsidence was discussed. The rational position of the construction of the new tunnel was obtained. Results show that appropriate increase of the vertical net distance between the new and existing tunnels and the horizontal spacing of the new tunnel can effectively control the settlement values of the surface and the existing tunnel. However, considering all aspects of tunnel construction and operation costs, it is proposed that the new and existing tunnels should be controlled between 6 and 10m, whereas the horizontal spacing of the new tunnel should be greater than 2D. Otherwise, the need to strengthen the tunnel surrounding soil and other auxiliary measures would occur in order to ensure the safety of the existing tunnel structure and the smooth construction of the new tunnel. The results of the research have good engineering practice value for the construction of the new tunnel perpendicularly undercrossing the existing tunnel.
Key words: new tunnel; perpendicular undercrossing; existing tunnel; reasonable position; numerical analysis