理论与试验研究

砂土地层浅埋隧道掌子面被动极限支护压力计算

  • 叶友林 ,
  • 钱子杰 ,
  • 路志旺 ,
  • 商诗健 ,
  • 牛奔
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  • 1.沈阳建筑大学 土木工程学院,沈阳 110168;
    2.沈阳建筑大学 交通与测绘工程学院,沈阳 110168;
    3.中国建筑第六工程局有限公司天津轨道交通分公司,天津 300451
叶友林(1985—),男,河南汝南人,博士,教授,主要从事隧道结构变形及地下工程方面的研究。E-mail:yeyoulin1985@126.com

收稿日期: 2024-06-14

  网络出版日期: 2025-06-13

基金资助

国家自然科学基金(52008269);辽宁省博士科研启动基金(2024010136-JH3/101)

Calculation of Passive Limit Support Pressure of Shallow Buried Tunnel Face in Sandy Soil Stratum

  • Ye Youlin ,
  • Qian Zijie ,
  • Lu Zhiwang ,
  • Shang Shijian ,
  • Niu Ben
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  • 1. School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, P.R. China;
    2. School of Transportation Engineering, Shenyang Jianzhu University, Shenyang 110168, P.R. China;
    3. China Construction Sixth Engineering Bureau Limited Tianjin Rail Transit Branch, Tianjin 300451, P.R. China

Received date: 2024-06-14

  Online published: 2025-06-13

摘要

为了更好地评估砂土地层中浅埋盾构隧道掌子面被动失稳破坏模式,对既有三维计算模型进行改进,使失效区域更接近真实土体破坏轮廓,考虑上下部块体之间的摩擦,采用极限平衡法,建立极限支护压力计算公式。采用有限差分软件FLAC3D构建数值模型,分析掌子面被动破坏支护力变化规律及破坏模式。将理论模型得到的极限支护压力解与数值模拟及现有被动破坏理论模型得到的解进行比较,验证模型的可靠性。结果表明:理论计算模型可以满足掌子面被动失稳的极限支护压力计算;极限平衡计算模型的上下块体间存在摩擦,考虑静摩擦力进行计算更为合理;对数螺线转角的最优解受到内摩擦角的影响,当内摩擦角增大时,对数螺线转角的最优解会变小;浅埋盾构隧道掌子面被动极限支护压力随着土体内摩擦角的增大而增大,随着隧道直径的增大而减小。

本文引用格式

叶友林 , 钱子杰 , 路志旺 , 商诗健 , 牛奔 . 砂土地层浅埋隧道掌子面被动极限支护压力计算[J]. 地下空间与工程学报, 2025 , 21(3) : 805 -815 . DOI: 10.20174/j.JUSE.2025.03.08

Abstract

In order to better evaluate the passive instability failure mode of shallow shield tunnel face in sandy soil stratum, the existing three-dimensional calculation model is improved to make the failure area closer to the real soil failure contour. Considering the friction between the upper and lower blocks, the limit support pressure calculation formula is established by using the limit equilibrium method. The finite difference software FLAC3D is used to construct the numerical model, and the variation law and failure mode of the passive failure support force of the tunnel face are analyzed. The limit support pressure solution obtained by the theoretical model is compared with the solution obtained by numerical simulation and the existing passive failure theoretical model to verify the reliability of the model. The results show that: The proposed theoretical calculation model can meet the limit calculation of passive instability of the tunnel face. The limit equilibrium method is used to calculate the friction between the upper and lower blocks of the model, and it is more reasonable to consider the static friction force. The optimal solution of the logarithmic spiral angle is affected by the internal friction angle. When the internal friction angle increases, the optimal solution of α will become smaller. The passive limit support pressure of the tunnel face of the shallow shield tunnel increases with the increase of the internal friction angle of the soil and decreases with the increase of the tunnel diameter.

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