研究目的: 目前对海底隧道渗流场的研究大多基于半无限空间的单孔隧道,考虑实际工程常采用三孔并行的排布方式,且实际工程中隧道下方常存在相对不透水层或基岩等不透水边界,本文以渗流力学为基础采用镜像法和竖井理论推导有限厚度地层海底隧道渗流场解析解,将公式进行退化和数值验证,并对不透水边界距离、三孔隧道埋深、间距及注浆参数进行分析。
研究结论: (1)隧道下方不透水边界对涌水量影响较大,当不透水边界距隧道中心为25r1时,对涌水量基本没有影响;(2)三孔并行隧道间渗流场存在相互影响,且随隧道间距的增加影响逐渐减弱,当隧道间距大于30r1时,涌水量基本没有影响;(3)三孔并行隧道涌水量随埋深增大呈现出先减小后增大趋势,埋深为2r1时涌水量最小;(4)三孔并行隧道涌水量随注浆圈厚度增大和渗透系数减小而减小,实际工程中应注浆密实度和注浆厚度并重;(5)本研究成果可为相关海底隧道工程的设计与施工提供参考。
Abstract
Research purposes: At present, the research on the seepage field of subsea tunnels is mostly based on the single-hole tunnel in semi-infinite space. Considering that the actual project often uses the three-hole parallel layout method and that there are often impermeable boundaries such as a relatively impermeable layer or bedrock under the tunnel in the actual project, this paper uses the image method and the shaft theory to derive the analytical solution of the seepage field of the subsea tunnel in soil of finite depth based on the seepage mechanics, and the formula is degenerated and verified numerically. The impermeable boundary distance, buried depth, spacing, and grouting parameters of the three-hole tunnel are analyzed.
Research conclusions: (1)The impermeable boundary under the tunnel has a great impact on the water inflow. When the impermeable boundary is 25r1 from the tunnel center, it has no impact on the water inflow.(2)The seepage field between three parallel tunnels affects each other, and the influence gradually weakens with the increase of tunnel spacing. When the tunnel spacing is greater than 30r1, the water inflow basically has no effect.(3)The water inflow of three-hole parallel tunnel decreases first and then increases with the increase of buried depth, and the water inflow is the smallest when the buried depth is 2r1.(4)The water inflow of the three-hole parallel tunnel decreases with the increase of the thickness of the grouting and the decrease of the permeability coefficient. In practical engineering, the grouting compactness and grouting thickness should be equally important.(5)The results of this study can provide reference and guidance for the design and construction of relevant subsea tunnel projects.
关键词
海底隧道 /
三孔并行 /
有限厚度地层 /
渗流场解析解 /
涌水量
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Key words
subsea tunnel /
three-hole parallel /
soil of finite depth /
analytical solution of seepage field /
water inflow
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中图分类号：
U452
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参考文献
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脚注
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基金
国家自然科学基金项目(51978424);河北省重点研发计划项目(22375416D);河北省自然科学基金项目(E2022210040)
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