新建隧道正交下穿既有隧道合理位置的研究  

Study on the rational position of the new tunnel perpendicularly undercrossing the existing tunnel

作　　者：刘颀楠[1] 

机构地区：[1]江苏建筑职业技术学院能源与交通学院,江苏徐州221006

出　　处：《铁道科学与工程学报》2016年第11期2229-2234,共6页Journal of Railway Science and Engineering

基　　金：交通运输部西部交通建设科技资助项目(200831800044)

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。In order to reveal the influence of the construction of the new tunnel on the safety of the existing tun-nel structure and surface buildings. Based on a new subway tunnel project, a three-dimensional finite differencemethod was used to construct the three-dimensional numerical model of the perpendicularly undererossing tunne-ling construction on the existing tunnel. The influence of the vertical distance between the new and existing tun-nels on the deformation of the existing tunnel structure and the law of the surface subsidence was discussed. Therational position of the construction of the new tunnel was obtained. Results show that appropriate increase of thevertical net distance between the new and existing tunnels and the horizontal spacing of the new tunnel can effec-tively control the settlement values of the surface and the existing tunnel. However, considering all aspects of tun-nel construction and operation costs, it is proposed that the new and existing tunnels should be controlledbetween 6 and 10m, whereas the horizontal spacing of the new tunnel should be greater than 2D. Otherwise, theneed to strengthen the tunnel surrounding soil and other auxiliary measures would occur in order to ensure thesafety of the existing tunnel structure and the smooth construction of the new tunnel. The results of the researchhave good engineering practice value for the construction of the new tunnel perpendicularly undercrossing the ex-isting tunnel.

关 键 词：新建隧道 正交下穿 既有隧道 合理位置 数值模拟 

分 类 号：TU471.8[建筑科学—结构工程]