Study on Tunnel Face Stability and Reasonable Grouting Reinforce Parameters in Ice Water Accumulation
Based on the ice water accumulation section of Milin tunnel in Linzhi City,Xizang Autonomous Region,the numerical models and without considering seepage are established to compare the relationship between relative extrusion deformation and strength reduction coefficient of tunnel face with different grouting reinforce parameters.The results show that under the above two conditions,the curve trend of different grouting parameters and tunnel safety factor is consistent.The tunnel safety factor increases with the increase of grouting thickness,transverse length of grouting and equivalent cohesive force and gradually tends to be stable.The permeability coefficient has little effect on the tunnel safety factor.However,the safety factor of tunnel face considering seepage is much less than that without considering seepage.
ice water accumulation tunnelstability of tunnel facereasonable grouting reinforce parametersseepage condition
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