摘要
利用有限差分软件FLAC^(3D),建立辅助通道以不同角度(30°,45°,60°,75°,90°)进入隧道主洞的模型,对不同围岩级别下的工况进行模拟。得到以下结论:在相同围岩条件下,主洞开挖阶段,角度越大,交叉口处隧道围岩的竖向变形量越小;主洞开挖阶段,交叉角越大,最大主应力越小,最小主应力越大,交叉口处的拱顶及仰拱的形变值随角度的增大而减小,且为非线性变化;交叉口处隧道的最大主应力在主洞开挖前后的变化量随角度的增大而减小,最小主应力的变化量随角度的增大而增大;主洞开挖前后,拱顶围岩位移变化量大于仰拱围岩位移变化量。
Using the finite difference software FLAC^(3D),a model of the auxiliary passage entering the main tunnel at different angles(30°,45°,60°,75°,90°)was established,and the working conditions under different surrounding rock levels were simulated.The following conclusions are obtained:Under the same conditions of surrounding rock,the larger the angle of the main tunnel excavation stage,the smaller the vertical deformation of the surrounding rock at the intersection.In the excavation stage of the main tunnel,the larger the intersection angle,the smaller the maximum principal stress,the greater the minimum principal stress,and the deformation value of the arch and inverted arch at the intersection decreases with the increase of the angle,and it is a nonlinear change.The change of the maximum principal stress of the tunnel at the intersection before and after the excavation of the main tunnel decreases with the increase of the angle,and the change of the minimum principal stress increases with the increase of the angle.Before and after the excavation of the main tunnel,the displacement change of the surrounding rock of the vault is greater than that of the surrounding rock of the inverted arch.
作者
张伦钊
Zhang Lunzhao(Sichuan Communications Construction Group Co.,Ltd.,Chengdu Sichuan 610000,China)
出处
《山西建筑》
2024年第22期136-139,共4页
Shanxi Architecture
关键词
交叉口
辅助通道
深埋隧道
FLAC^(3D)有限元
围岩响应
intersection
auxiliary passage
deep tunnel
FLAC^(3D)finite element analysis
surrounding rock response
