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Numerical analysis of water flow characteristics after inrushing from the tunnel floor in process of karst tunnel excavation

机译：岩溶隧道开挖过程中底板涌水后水流特征的数值分析

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摘要

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.
机译：为了研究岩溶隧道开挖过程中突水后的水流特征，在齐岳山高危岩溶隧道的背景下，利用FLUENT软件对隧道底板突水的五个案例进行了数值模拟。首先，通过选择平面中的一系列探测线来绘制速度-距离曲线和压力-距离曲线。然后，分析了速度和压力的变化特征，并制定了各自的最佳逃生路线。最后，通过比较不同涌水位置和开挖情况下的案例研究，对隧道底板涌水后的水流特征进行了讨论和总结。结果表明：（1）隧道施工人员应首先移至隧道侧壁，然后在发生突水时迅速逃脱。 （2）逃生时，隧道施工人员不得停留在交叉通道和隧道的交叉区域。 （3）当左隧道发生底板涌水时，如果隧道施工人员在逃生过程中遇到交叉通道，则应迅速通过该通道，转向右隧道并进入入口。 （4）当左隧道发生底板涌水时，如果没有足够的时间逃逸，则隧道施工人员可以奔向右隧道工作面附近的手推车和其他设备。另外，可以在十字通道的较高位置设置一些救援设备。 （5）当交叉通道发生地面倒水时，隧道施工人员应迅速移至隧道侧壁，无涌水的情况下转向隧道，直奔入口。 （6）如果在交叉通道中发生从地面涌水的情况，则如果没有足够的时间逃逸，则隧道施工人员可以奔向左或右隧道工作面附近的手推车和其他设备。结果对确保隧道施工安全具有重要的现实意义和工程价值。

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  • 来源
    《Geomechanics and engineering》 |2016年第4期|471-526|共56页
  • 作者

    Li S. C.; Wu J.; Xu Z. H.; Li L. P.; Huang X.; Xue Y. G.; Wang Z. C.;

  • 作者单位

    Shandong Univ, Geotech & Struct Engn Res Ctr, Jinan 250061, Shandong, Peoples R China;

    Shandong Univ, Geotech & Struct Engn Res Ctr, Jinan 250061, Shandong, Peoples R China;

    Shandong Univ, Geotech & Struct Engn Res Ctr, Jinan 250061, Shandong, Peoples R China;

    Shandong Univ, Geotech & Struct Engn Res Ctr, Jinan 250061, Shandong, Peoples R China;

    Shandong Univ, Geotech & Struct Engn Res Ctr, Jinan 250061, Shandong, Peoples R China;

    Shandong Univ, Geotech & Struct Engn Res Ctr, Jinan 250061, Shandong, Peoples R China;

    Shandong Univ, Geotech & Struct Engn Res Ctr, Jinan 250061, Shandong, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    water inrush; velocity; pressure; flow characteristic; optimized escape routes; karst tunnel;

    机译：突水;速度;压力;流量特性;优化的脱险通道;岩溶隧道;

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