Study on Layout Design and Construction Stability of Diversion Tunnel Junction
[Purposes]This paper aims solve the problems of narrow terrain,complex logistics organiza-tion,large mutual interference during construction,complex stress and poor stability of surrounding rock at the intersection of the 2#construction branch hole and the main hole of Longtan Tunnel.[Methods]It is proposed to set up a bottom-hole slag transfer yard at the intersection of the main and branch tunnels.The overall layout scheme of the bottom-hole sinking trackless track three-dimensional conversion slag yard is elaborated in detail,and the adverse impact area of construction and the process that should be paid attention to are determined by numerical simulation.[Findings]This plan promotes the safe and rapid construction of the junction,and effectively improves the efficiency of slag discharge and material transportation in the subsequent tunnel construction.[Conclusions]In the tunnel construction with a large slope inclined shaft,the reasonable setting of the bottom slag field can solve the logistics organiza-tion problem of material transportation during tunnel construction.During the tunnel construction,the de-formation of the surrounding rock of the junction is large,so we should focus on the construction of the junction and strengthen the surrounding rock support of junction.
diversion tunneljunctionplane layoutstability of surrounding rock
NETL
NSTL
万方数据
