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Volume 39 Issue 4
Aug.  2020
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ZHANG Qiao. Finite element analysis on safety thickness of the inrush prevention layer in rock beds of the small Three Gorges karst tunnel[J]. CARSOLOGICA SINICA, 2020, 39(4): 614-621. doi: 10.11932/karst2020y33
Citation: ZHANG Qiao. Finite element analysis on safety thickness of the inrush prevention layer in rock beds of the small Three Gorges karst tunnel[J]. CARSOLOGICA SINICA, 2020, 39(4): 614-621. doi: 10.11932/karst2020y33

Finite element analysis on safety thickness of the inrush prevention layer in rock beds of the small Three Gorges karst tunnel

doi: 10.11932/karst2020y33
  • Publish Date: 2020-08-25
  • In view of the geotechnical characteristics of the karst in the small Three Gorges tunnel, the finite element method is used to establish a numerical calculation model of a typical tunnel section to analyze the variation laws of tunnel surrounding rock displacement and plastic zones when the water filled karst cave is located in different directions and distances of the tunnel. Then in combination with the displacement change of surrounding rock and the distribution of plastic zones, the minimum safe thickness of the rock layer to prevent water inrush from the surrounding rock of the tunnel is determined. The research results show that under the action of karst water pressure, when the cavity diameter ratio is fixed, the influence of the karst cave on the tunnel is gradually weakened as the cave gradually moves away from the tunnel. When the interval diameter ratio is fixed, the larger the diameter of the karst cave, the more obvious the influence on the tunnel. At the same time, according to the displacement of surrounding rock and the calculation results of plastic zones, the minimum inrush prevention thickness of the tunnel surrounding rock is obtained. The research results can provide technical support for the safe construction in the small Three Gorges karst tunnel.

     

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