不同净距下浅埋分岔隧道力学行为研究-《高速铁路技术》

文章信息/Info

Title:: Study on Mechanical Behavior of Shallow-buried Bifurcation Tunnels with Different Clear Distances

Author(s):: XING Yuyao; XIE Yizheng; Chongqing Jiaotong University, Chongqing 400074, China

Keywords:: shallow-buried bifurcation tunnel|close-spaced tunnel|surrounding rock displacement|different clear distances|numerical simulation

摘要:: 文章以重庆市嘉滨路连接道为工程背景,采用有限元法与现场监控、量测对不同净距下浅埋分岔隧道力学行为进行了研究,结果表明:(1)对于围岩位移来说,隧道净距越大,连接断面水平收敛就越大,净距越小,连接断面拱顶及拱底的竖向位移就越大;(2)对于初期支护应力,沿隧道方向的初支应力主要集中在连接断面前2 m的小净距隧道拱脚处以及中夹岩左右侧拱肩处,且隧道过渡段初期支护主应力随净距的增加而减小。

Abstract:: Based on the case study of Jiabin Road connecting road in Chongqing, this paper studies the mechanical behavior of shallow-buried bifurcation tunnels with different clear distances by using the finite element method, field monitoring, and measurement. The results show that: (1) For the displacement of surrounding rock, the larger the tunnel clearance, the greater the horizontal convergence of the connecting section, and the smaller the clearance, the greater the vertical displacement of the crown and the invert of the connecting section. (2) As for the primary support stress, the primary support stress along the tunnel direction is mainly concentrated at the arch springing of the close-spaced tunnel of 2 m in front of the connecting section and at the arch spandrels on the left and right sides of the intermediate rock, and the primary support principal stress of the transition section of the tunnel decreases with the increase of the clear distance.