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泥水盾构泥膜渗透性及其对开挖面稳定性影响

陈仁朋, 尹鑫晟, 李育超, 孟凡衍, 亓帅

陈仁朋, 尹鑫晟, 李育超, 孟凡衍, 亓帅. 泥水盾构泥膜渗透性及其对开挖面稳定性影响[J]. 岩土工程学报, 2017, 39(11): 2102-2108. DOI: 10.11779/CJGE201711018
引用本文: 陈仁朋, 尹鑫晟, 李育超, 孟凡衍, 亓帅. 泥水盾构泥膜渗透性及其对开挖面稳定性影响[J]. 岩土工程学报, 2017, 39(11): 2102-2108. DOI: 10.11779/CJGE201711018
CHEN Ren-peng, YIN Xin-sheng, LI Yu-Chao, MENG Fan-yan, QI Shuai. Permeability of filter cake and its influence on face stability of slurry shield-driven tunnels[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(11): 2102-2108. DOI: 10.11779/CJGE201711018
Citation: CHEN Ren-peng, YIN Xin-sheng, LI Yu-Chao, MENG Fan-yan, QI Shuai. Permeability of filter cake and its influence on face stability of slurry shield-driven tunnels[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(11): 2102-2108. DOI: 10.11779/CJGE201711018

泥水盾构泥膜渗透性及其对开挖面稳定性影响  English Version

基金项目: 国家自然科学基金项目(51225804,U1234204,41472244); 教育部博士点基金项目(20120101110027)
详细信息
    作者简介:

    陈仁朋(1972-),男,教授,博士生导师,主要从事土的基本特性、土与结构相互作用等方面的教学和科研工作。E-mail:chenrp@zju.edu.cn。

  • 中图分类号: TU432

Permeability of filter cake and its influence on face stability of slurry shield-driven tunnels

  • 摘要: 泥膜是维持泥水盾构开挖面稳定的关键因素。通过渗透柱试验研究了加压泥浆向砂土渗透、并在砂土表面形成泥膜的行为,获得了泥膜渗透性与时间的关系。结果显示泥水盾构在开挖时,由于刀盘不断切削泥膜,开挖面上只能形成微透水的泥膜;当拼装管片时,刀盘停止转动,开挖面上则会形成难透水的泥膜。建立了在开挖面上设置微透水的泥膜的二维数值模型,通过瞬态渗流分析获得土体孔压的最大值。根据地层孔压计算了失稳区域内的渗透力,获得了不同泥浆压力下在泥膜表面和地层中的分配比例。当有效泥浆压力越大,孔压在泥膜和失稳区以外地层的下降幅度就越大,对维持开挖面稳定的贡献越小。基于极限平衡法,提出了泥水盾构开挖面极限泥浆压力的计算方法,结果显示目前工程中采用的方法高估了开挖面极限泥浆压力。
    Abstract: The hydraulic conductivity of filter cake is important for the stability of tunnel face when the slurry shield is excavated. The behaviors of slurry penetration and filter cake formation are investigated based on the infiltration column tests. The change of hydraulic conductivity of filter cake with time is obtained from tests. The permeable filter cake is formed on the tunnel face during advancing because the filter cake is destroyed by cutter and re-built. The scarcely-permeable filter cake is formed during assembling of linings because the cutter wheel stops rotating. A two-dimensional numerical model considering the permeable filter cake is established for calculating the pore pressure in the filter cake and stratum. The numerical results show the maximum pore pressure when the slurry shield is advancing. The seepage forces on the filter cake and failure zone are computed according to the pore pressure. The distributive ratios of the seepage force in the filter cake to the seepage force in the stratum are obtained under different slurry pressures. The efficiency of stabilizing the tunnel face deteriorates when the slurry pressure increases. For a higher slurry pressure, more pore pressure drops beyond the failure zone. A new calculation approach for the limit slurry pressure is proposed based on the limit equilibrium method. The results show that the limit slurry pressure is overestimated by the existing methods.
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出版历程
  • 收稿日期:  2017-01-28
  • 发布日期:  2017-11-24

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