Optimization Analysis of Grouting Fault Fracture Zone Tunnel Based on Numerical Simulation
Geological disasters of water and mud inrush of tunnels occur in fault fracture zones,which may cause not only casualties but also economic losses and construction time delays.In order to solve the problem of sudden water inrush during tunnel construction,the fault fracture zone of No.1 Tunnel,Daliangshan,is taken as an example.Ac-cording to the engineering geological conditions and hydrogeological characteristics,the tunnel is divided into dif-ferent risk levels.The pure water slurry or cement-water glass double slurry grouting materials were applied in dif-ferent risk levels of tunnel sections by grouting measures such as post excavation peripheral grouting,peripheral deep hole pre grouting and full section deep hole pre-grouting.In addition,a numerical model is established by COMSOL software to study the changing law of tunnel stress and seepage after grouting.The research results show that grouting effectively alleviates stress concentration and reduces seepage concentration so that thereby reducing he incidence of sudden water inrush can be reduced in tunnels during construction.
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