泥水盾构泥膜形成时开挖面地层孔压变化规律研究

闵凡路; 朱伟; 魏代伟; 夏胜全

泥水盾构泥膜形成时开挖面地层孔压变化规律研究 English Version

闵凡路¹,
朱伟^{2, 3},
魏代伟²,
夏胜全²

1. 河海大学力学与材料学院，江苏南京 210098; 2. 河海大学岩土工程科学研究所，江苏南京 210098

基金项目: 国家重点基础研究发展计划（973计划）项目（2012CB719804）；国家自然科学基金项目（50908075，50979028）；江苏省重点基金项目（BK2011025）

详细信息

作者简介:
闵凡路(1985- )，男，山东滕州市人，博士研究生，主要从事泥水盾构开挖面稳定性控制及泥浆成膜等方面的研究。E-mail: minfanlu@126.com。

中图分类号: TU411
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出版历程
- 收稿日期: 2012-03-08
- 发布日期: 2013-04-17

Change of pore water pressure in soil as filter cakes formed on excavation face in slurry shield

1. College of Mechanics and Materials, Hohai University, Nanjing 210098, China. 2. Geotechnical Research Institute of Hohai University, Nanjing 210098, China; 3. College of Environmental Science and Engineering, Hohai University, Nanjing 210098, China

摘要

摘要: 为保证开挖面的稳定，泥水盾构泥水舱中的泥浆必须在开挖面上形成微透水的泥膜，将部分泥浆压力转化为有效应力，泥浆压力才能平衡地层中的土压力和水压力。目前关于泥膜形成时泥浆压力的转化规律及其影响因素尚不清楚。针对这一问题，在自制的泥浆渗透装置中，以12组不同性质的泥浆开展渗透试验，通过测定泥膜形成过程中地层超静孔隙水应力的变化，并分析影响其分布的因素，明确了泥膜的作用机理。结果表明：随着泥膜的形成，泥浆压力在地层中转化为抵抗地层静水压力的孔压、超静孔隙水应力和抵抗地层土压力的有效应力；超静孔隙水应力在泥膜段迅速降低，在地层深处逐渐趋于稳定；泥浆的密度是影响地层超静孔隙水压力分布规律的主要因素之一，泥浆黏度对其影响较小。这一结果对于泥浆压力的设定和泥浆的配制有重要的指导意义。
- 泥水盾构 /
- 开挖面稳定 /
- 泥浆压力 /
- 泥膜 /
- 超静孔隙水应力
Abstract: To ensure the stability of excavation face in slurry shield, a filter cake with low permeability must be formed on the working face. Based on the filter cake, part of the slurry pressure can transform into effective stress. Then the slurry pressure can counteract the soil pressure and water pressure in the soil. The variation of slurry pressure as forming a filter cake and its influencing factors are still unknown at present. With regard to the problem, a slurry infiltration apparatus is developed and a series of pressure filtration tests are carried out on 12 different slurries. By measuring the change of the excess pore water pressure as forming a filter cake and analyzing its influencing factors, the working mechanism of the filter cake is identified. The test results indicate that the slurry pressure is transformed into three different parts: pore pressure to counteract the water pressure, excess pore water pressure, and effective pressure to counteract the soil pressure. The excess pore water pressure rapidly decreases in the filter cake, then reaches a steady value in the deep zone of soil. The density of slurries is one of the primary factors that influence the distribution of the excess pore water pressure, while the viscosity has little effect on it. This study has an important directive significance for setting slurry pressure and adjusting slurry in slurry shield.
- slurry shield /
- excavation face stability /
- slurry pressure /
- filter cake /
- excess pore water pressure

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参考文献(13)

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泥水盾构泥膜形成时开挖面地层孔压变化规律研究 English Version

作者简介: 闵凡路(1985- )，男，山东滕州市人，博士研究生，主要从事泥水盾构开挖面稳定性控制及泥浆成膜等方面的研究。E-mail: minfanlu@126.com。

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出版历程

Change of pore water pressure in soil as filter cakes formed on excavation face in slurry shield

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目录

作者简介:
闵凡路(1985- )，男，山东滕州市人，博士研究生，主要从事泥水盾构开挖面稳定性控制及泥浆成膜等方面的研究。E-mail: minfanlu@126.com。