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Numerical analysis of water flow characteristics after inrushing from the tunnel floor in process of karst tunnel excavation
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  • Journal title : Geomechanics and Engineering
  • Volume 10, Issue 4,  2016, pp.471-526
  • Publisher : Techno-Press
  • DOI : 10.12989/gae.2016.10.4.471
 Title & Authors
Numerical analysis of water flow characteristics after inrushing from the tunnel floor in process of karst tunnel excavation
Li, S.C.; Wu, J.; Xu, Z.H.; Li, L.P.; Huang, X.; Xue, Y.G.; Wang, Z.C.;
 Abstract
In order to investigate water flow characteristics after inrushing in process of karst tunnel excavation, numerical simulations for five case studies of water inrush from the tunnel floor are carried out by using the FLUENT software on the background of Qiyueshan high risk karst tunnel. Firstly, the velocity-distance curves and pressure-distance curves are drawn by selecting a series of probing lines in a plane. Then, the variation characteristics of velocity and pressure are analyzed and the respective optimized escape routes are made. Finally, water flow characteristics after inrushing from the tunnel floor are discussed and summarized by comparing case studies under the conditions of different water-inrush positions and excavation situations. The results show that: (1) Tunnel constructors should first move to the tunnel side wall and then escape quickly when water inrush happens. (2) Tunnel constructors must not stay at the intersection area of the cross passage and tunnels when escaping. (3) When water inrush from floor happens in the left tunnel, if tunnel constructors meet the cross passage during escaping, they should pass through it rapidly, turn to the right tunnel and run to the entrance. (4) When water inrush from floor happens in the left tunnel, if there is not enough time to escape, tunnel constructors can run to the trolley and other equipment in the vicinity of the right tunnel working face. In addition, some rescuing equipment can be set up at the high location of the cross passage. (5) When water inrush from floor happens in the cross passage, tunnel constructors should move to the tunnel side wall quickly, turn to the tunnel without water inrush and run to the entrance. (6) When water inrush from floor happens in the cross passage, if there is not enough time to escape, tunnel constructors can run to the trolley and other equipment near by the left or the right tunnel working face. The results are of important practical significance and engineering value to ensure the safety of tunnel construction.
 Keywords
water inrush;velocity;pressure;flow characteristic;optimized escape routes;karst tunnel;
 Language
English
 Cited by
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Semianalytical Solution to Determine Minimum Safety Thickness of Rock Resisting Water Inrush from Filling-Type Karst Caves, International Journal of Geomechanics, 2018, 18, 2, 04017152  crossref(new windwow)
2.
A multi-factor comprehensive risk assessment method of karst tunnels and its engineering application, Bulletin of Engineering Geology and the Environment, 2017  crossref(new windwow)
3.
Flow Characteristics and Escape-Route Optimization after Water Inrush in a Backward-Excavated Karst Tunnel, International Journal of Geomechanics, 2017, 17, 4, 04016096  crossref(new windwow)
4.
A possible prediction method to determine the top concealed karst cave based on displacement monitoring during tunnel construction, Bulletin of Engineering Geology and the Environment, 2017  crossref(new windwow)
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