铁道科学与工程学报2016，Vol.13Issue(11)：2229-2234,6.
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
摘要
Abstract
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 difference method was used to construct the three-dimensional numerical model of the perpendicularly undercrossing 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.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 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 controlled between 6 and 1 0m,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 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Key words
new tunnel/perpendicular undercrossing/existing tunnel/reasonable position/numerical analysis分类
建筑与水利引用本文复制引用
刘颀楠..新建隧道正交下穿既有隧道合理位置的研究[J].铁道科学与工程学报,2016,13(11):2229-2234,6.基金项目
交通运输部西部交通建设科技资助项目 （）
