多空隙组合介质隧道渗透物理模型试验

发布时间：2018-05-23 18:11

本文选题：隧道开挖 + 渗流物理模型　；参考：《中国农村水利水电》2017年03期

【摘要】：跃龙门隧道工程施工期出现严重的涌突水问题,不仅制约隧道开挖安全,而且会因地下水位降低而触发该区植被生态健康问题。结合该隧道的水文地质条件,并基于相似模型原理,选用普通砖钻孔填砂模拟具有多空隙组合特征的岩体,设计研制了隧道渗透物理模型。物理模型考虑了岩体主要裂隙倾角分别为0°和60°两种情况。对两个倾角8种工况进行了渗透试验,测试分析表明:(1)主要裂隙方向会对渗流产生较大的影响,当倾角与水流方向夹角较小时涌水现象较为突出;(2)隧道正上方的地下水位下降最快,离隧道轴线越远的水位下降越慢,稳定渗流时的水位也越高,连接相同高程测点在同一时刻的水位形成的水面线均呈现降落漏斗形状;(3)试验获得的稳定渗流时间与原型观测结果一致;(4)模型影响范围与数值计算隧道开挖影响范围较为接近。
[Abstract]:Serious water inrush occurred during the construction period of Yuelongmen Tunnel, which not only restricted the safety of tunnel excavation, but also triggered the ecological health problem of vegetation in this area because of the lowering of groundwater level. Combined with the hydrogeological conditions of the tunnel and based on the principle of similar model, the permeability physical model of the tunnel is designed and developed by selecting ordinary brick drilled sand to simulate the rock mass with the characteristics of multi-void combination. The physical model takes into account that the inclination of the main fractures is 0 掳and 60 掳, respectively. The permeation tests were carried out on two inclined angles under 8 working conditions. The test and analysis show that the direction of the main fractures will have a great influence on the seepage flow. When the angle of inclination and the direction of water flow is small, the phenomenon of water gushing is more prominent.) the groundwater level above the tunnel decreases fastest, the farther away from the axis of the tunnel, the lower the water level, and the higher the water level when the seepage is stable. The stable seepage time obtained by the experiment is consistent with the prototype observation results. The influence range of the model is close to that of the numerical calculation of tunnel excavation.
【作者单位】：四川大学水力学与山区河流保护国家重点实验室;四川大学水利水电学院;核工业西南勘察设计研究院有限公司;
【基金】：国家重点基础研究发展规划项目(“973”计划)(2015CB057903) 四川省科技计划专项(2014SS027,CLRQT-2013-010)
【分类号】：U451

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