Numerical Simulation of a Mined Tunnel Through Mixed Fill Stratum
Based on a mined section of Xi'an metro line 8,a 3D numerical calculation model of the mined tunnel through mixed fill stratum is established by FLAC3D.Then the stress and deformation of surrounding rock,stress and deformation of lining structure and surface deformation are analyzed.The results show that the stress of sur-rounding rock is distributed in layers and increased with buried depth.The tunnel excavation disturbance area is within about 1 time of tunnel diameter;When the mined tunnel is excavated,the influence range and deformation of surrounding rock gradually increase and becomes stable;The stress in both sides of lining structure and vault are concentrated and diffused,showing compressive stress and tensile stress.The horizontal deformation of the tunnel side wall is the greatest,the vertical deformation shows settlement in vault and uplift at the arch bottom;The hori-zontal deformation of the surface at the central axis of the tunnel is zero,which has a central symmetric distribution;The vertical deformation of the surface is the greatest at the central axis,which has an axisymmetric distribution.The relevant conclusions can provide reference for the construction of similar mined tunnels.
mined tunnelmixed fill stratumnumerical simulationstressdeformation
国家科技期刊平台
NSTL
万方数据
