Abstract
AbstractIn this paper, the construction process of the diversion tunnel of Er-Jia-Gou Reservoir in Harbin is numerically simulated. Based on Biot consolidation theory and porous elastic medium theory, considering the influence of groundwater seepage during the construction process, a three-dimensional fluid solid coupling model of the tunnel is established to simulate the seepage field, stress field and displacement field changes during the construction process. According to the calculation results, the distribution of pore water pressure and stress around the tunnel during the construction process is analyzed, and the variation rules of pore water pressure, stress and the displacement of the vault and arch bottom of the tunnel are obtained when the shallow tunnel construction passes through the sudden change area of rock mass. Finally, the influence range of the sudden change area of rock mass grade in the tunnel construction process is determined: pore water pressure, stress and vertical displacement will be affected at 20 m from the sudden change area. The results of the paper can provide reference for the safe construction of shallow tunnels.
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