Analysis on Safety Stability of Deep Tunnel Initial Support in SwellingLoess Based on FLAC3D
JI Yu-guo
YU Fei-fei
ZHANG Xian-tang
LI Hui
ZHOU Hong-min
Abstract：In order to analyze and study the safety stability after the initial support of the deep tunnel in swelling loess,based on the deep section of the Xiaohegou loess Tunnel engineering with a depth of about 88 m,a FLAC3D software was applied to the numerical simulation on the tunnel excavation and support before and after the design changed and to analyze the stress and deformation of the surrounding rock,the deformation of the combined support structure and the soil displacement condition of the unexcavated section in front of the tunnel.The results showed that in the construction of the deep tunnel in the swelling loess,a pilot support was conducted with the pilot small duct grouting outside the pipe shield.With the steel arch supports and the bolt/steel mesh/shotcreting combined support,the pilot support could effectively improve the whole strength and self stability of the surrounding rock,could bear the loading of the surrounding rock,could reduce the soil displacement and could improve the safety of the construction.
Keywords：loess tunnelinitial supportnumerical simulationFLAC3D softwarestability
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 43-47 )