›› 2017, Vol. 38 ›› Issue (4): 925-933.doi: 10.16285/j.rsm.2017.04.001

• 基础理论与实验研究 •    下一篇

考虑渗滤效应的砂土介质注浆扩散规律研究

李术才,冯 啸,刘人太,张乐文,韩伟伟,郑 卓   

  1. 山东大学 岩土与结构工程研究中心,山东 济南 250061
  • 收稿日期:2015-05-04 出版日期:2017-04-11 发布日期:2018-06-05
  • 作者简介:李术才,男,1965年生,博士,教授,博士生导师,主要从事裂隙岩体断裂损伤与地质灾害超前预报及防治方面的教学与研究工作。
  • 基金资助:

    国家自然科学青年基金(No. 51309146);山东大学自主创新基金(No. 2012GN011)。

Diffusion of grouting cement in sandy soil considering filtration effect

LI Shu-cai, FENG Xiao, LIU Ren-tai, ZHANG Le-wen, HAN Wei-wei, ZHENG Zhuo   

  1. Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan, Shandong 250061, China
  • Received:2015-05-04 Online:2017-04-11 Published:2018-06-05
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (51309146) and Independent Innovation Fund of Shandong University (2012GN011).

摘要: 在对砂土介质渗透注浆过程中,砂土骨架颗粒对水泥颗粒产生滤过作用,导致水泥颗粒发生不均匀扩散,称之为渗滤效应。采用Kozeny-Carman模型,分析了渗滤效应对砂土介质孔隙率、渗透系数及水泥浆渗流速度的影响;应用自主研发的恒压注浆装置,研究了不同颗粒级配砂样在不同注浆参数下注浆量的变化规律,然后通过多元回归获得了水泥浆扩散距离的函数关系式。试验结果表明,渗滤效应对水泥颗粒滞留封堵的影响较大,水泥颗粒质量分数是影响浆液扩散距离的主控因素。依据达西渗流定律和回归关系式分别得到了考虑渗滤效应和忽略渗滤效应时水泥浆扩散距离的理论值,并与试验值进行比对分析,结果表明,忽略渗滤效应的理论值存在较大误差。所得结论可指导注浆设计,对类似工程具有借鉴意义。

关键词: 砂土介质, 渗滤效应, 恒压渗透注浆, 扩散规律, 多元回归分析

Abstract: In the process of grout penetration in sandy soil, the soil skeleton particles filtrate cement particle leading to an anisotropic diffusion, referred to as filtration effect. In this paper, Kozeny-Carman model is adopted to analyze the influence of filtration on soil porosity, permeability coefficient and slurry flow velocity. A constant pressure device is employed to investigate the grouting quantity variation of sand samples with different grading associated with different grouting parameters. Then, a quantitative relationship is obtained using multiple regression techniques. Test results show that filtration effect remarkably influences plugging behavior of cement grout and cement particle mass fraction is the main controlling factor of the grouting distance. According to Darcy’s law and regression relationship, theoretical values of grouting distance are determined with considering the filtration effect and ignoring the filtration effect respectively. Comparisons to the tested value indicate that omission of filtration effect lead to a considerable deviation of the theoretical value. Results can be used to instruct grouting design and offer references to similar projects.

Key words: sandy soil medium, filtration effect, constant pressure penetrating grouting, diffusion law, multiple regression analysis

中图分类号: 

  • TU 411

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