考虑浆液自重的盾构隧道管片注浆浆液渗透扩散模型

叶飞; 陈治; 孙昌海; 韩兴博; 杨涛; 纪明

doi:10.11779/CJGE201612005

考虑浆液自重的盾构隧道管片注浆浆液渗透扩散模型 English Version

叶飞¹,
陈治^{1, 2},
孙昌海¹,
韩兴博¹,
杨涛¹,
纪明¹

1. 长安大学公路学院,陕西西安 710064;
2. 广东省南粤交通投资建设有限公司,广东广州 510101

基金项目: 国家自然科学基金项目（51478044,51178052,51678062）

详细信息

作者简介:
叶飞(1977- ),男,教授,主要从事隧道与地下工程方面的教学和科研工作。E-mail: xianyefei@126.com。

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出版历程
- 收稿日期: 2015-10-19
- 发布日期: 2016-12-24

Penetration diffusion model for backfill grouting through segments of shield tunnel considering weight of grout

1. School of highway, Chang’an University, Xi’an 710064, China;;
2. Guangdong Nanyue Transportation Investment & Construction Co. Ltd., Guangzhou 510101, China;

摘要

摘要: 为研究盾构隧道管片注浆的渗透扩散模型,以宾汉姆浆液流体为研究对象,基于广义达西定律（毛管组理论）,并运用相关流体力学理论,推导了考虑浆液自重的盾构隧道管片注浆渗透扩散模型的计算公式,并分析了其适用范围及各参数的确定方法。结合具体计算案例,讨论了注浆参数（注浆压力、注浆时间）、地层特性（地层渗透系数）等主要因素对浆液扩散半径的影响及浆液对管片总压力的影响。结果表明：考虑浆液自重后,浆液的扩散范围呈椭球形;相同的注浆压力下,顶部注浆孔的浆液扩散范围小于底部注浆孔浆液扩散范围（顶部注浆孔出现最小扩散半径,底部注浆孔出现最大扩散半径）;注浆压力、注浆时间及地层渗透系数增大,浆液扩散半径也增大,但其增长速率均减小;注浆压力增大,管片所受的注浆压力增大,单位管片所受的浆液压力呈线性增长,考虑浆液自重后,上部单位管片所受的浆液压力大于下部单位管片所受的浆液压力;注浆压力越大,注浆时间越长,地层渗透系数越大,最大扩散半径与最小扩散半径的差值越大,即浆液自重对浆液扩散半径的影响越大。
- 盾构隧道 /
- 管片注浆 /
- 宾汉姆流体 /
- 渗透扩散
Abstract: In order to study the penetration diffusion model for backfill grouting through segments of shield tunnel, taking the Bingham fluid as research object, the formulae for calculating the backfill grouting through segments of shield tunnel are deduced based on the generalized Darcy's law (capillary group theory) by means of the theory of fluid mechanics and their application scopes and the determination methods for their parameters are analyzed. For a specific case, the influences of grouting parameters (grouting pressure and grouting time) and ground conditions (permeability coefficient) upon the radius of grout diffusion and the total pressure on segments are discussed. The results show that after considering the weight of grouts, the diffusion shape of the grouts looks like a spheroid. Under the same grouting pressure, the diffusion range of the grouts from the top grouting hole is smaller than that from the bottom grouting hole (the minimum diffusion radius appears at the top grouting hole and the maximum diffusion radius appears at the bottom grouting hole). The diffusion radius increases along with the increase of grouting pressure, grouting time and permeability coefficient of strata, but its growth rate decreases. The pressure on segments increases with the increase of grouting pressure, and the pressure on unit segment grows linearly. The grouting pressure on the upper unit segment is greater than that on the bottom one considering the weight of the grouts. The difference between the maximum and the minimum diffusion radiis will be larger if the pressure on segments is greater, the grouting time is longer and the permeability coefficient of strata is larger. That is to say, the weight of the grouts has a great impact on the diffusion radius of the grouts.
- shield tunnel /
- grouting through segment /
- Bingham fluid /
- penetration diffusion

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参考文献(21)

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