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工程科学与技术:2020,52(5):125-135
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基于颗粒吸附概率模型的渗透注浆滤过机制研究
(1.山东大学 岩土与结构工程研究中心,山东 济南 250061;2.纽卡斯尔大学 工程与建筑环境学院,澳大利亚 卡拉汉 NSW2308;3.山东建筑大学交通工程学院,山东 济南 250101;4.中国石油大学(华东) 储运与建筑工程学院,山东 青岛 266580;5.青岛地铁集团,山东 青岛 266000)
Study on the Filtration Mechanism in Permeation Grouting Using the Particle Deposition Probability Model
(1.Geotechnical and Structural Eng. Research Center, Shandong Univ., Jinan 250061, China;2.Faculty of Eng. and Built Environment, The Univ. of Newcastle, Callaghan NSW2308, Australia;3.School of Transportation Eng., Shandong Jianzhu Univ., Jinan 250101, China;4.College of Pipeline and Civil Eng., China Univ. of Petroleum, Qingdao 266580, China;5.Qingdao Subway Group Co. Ltd., Qingdao 266000, China)
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投稿时间:2019-08-16    修订日期:2020-08-21
中文摘要: 滤过效应对悬浊液渗透注浆扩散具有重要影响,滤过系数为渗透扩散关键影响参数,现有研究多将该系数假定为常数,具有较大局限性。考虑渗流域内各组分质量守恒,引入线性滤过定律,采用颗粒沉积概率模型描述水泥颗粒在多孔介质内沉积吸附行为,建立了考虑渗滤效应的水泥浆液渗透注浆柱形扩散理论模型。基于1维渗透注浆试验过程信息,提出了柱形扩散理论模型参数反演确定方法。自主研发了3维渗透注浆模型试验系统,可以实现恒流量条件下砂层渗透注浆以及试验过程中的多元信息采集。开展了3维渗透注浆柱形扩散模型试验,结合理论模型计算结果,对比分析了孔隙率及浆液压力时空变化规律,探讨了注浆速率及浆液水灰比对滤过机制影响规律,并对理论计算模型准确性进行了验证。结果表明,注浆速率越小,注浆口处孔隙率衰减量越大,同时孔隙率沿浆液扩散方向衰减越剧烈;浆液水灰比越小,孔隙率衰减越快,滤过效应越显著。与试验值对比,所建立模型孔隙率最大计算误差小于12%,注浆压力最大计算误差小于14.2%,所建立模型可较好地描述水泥浆液多孔介质柱形扩散过程。
Abstract:The filtration effect has an important effect on the diffusion of suspension permeation grouting. Filtration coefficient is the key parameter of permeation diffusion. Most of the existing studies assumed the coefficient as a constant, which had great limitations. Based on the mass conservation of each component, linear filtration law and homogeneous capillary model, the permeation diffusion equation of cement grout was established, using the particle deposition probability model to describe the filtered process of cement particles in porous media. Additionally, the determination method of model parameters was proposed. The 3D model test system of permeation grouting was developed. Using the model test system, the seepage grouting of sand with constant flow rate can be realized, and the multi-information in the grouting process can be collected. The model test of radial diffusion permeation grouting was carried out. The temporal and spatial variations of porosity and grout pressure were analyzed, combined with the theoretical model calculation results. The influences of grouting rate and water cement ratio on filtration mechanism were discussed, and the accuracy of theoretical calculation model was also verified. The results showed that the smaller the grouting rate, the bigger the porosity attenuation at the grouting hole, and the more severe the porosity attenuation along the slurry diffusion direction. The smaller the grout water-cement ratio, the faster the porosity attenuation and the more significant the filtration effect. Compared with the experimental results, the maximum calculation error of porosity and grouting pressure were less than 12% and 14.2%, respectively. The model can describe the radial diffusion process of cement slurry well.
文章编号:201900802     中图分类号:TU43    文献标志码:
基金项目:国家自然科学基金联合基金项目(U1706223);国家自然科学基金项目(51779133;51879152)
作者简介:朱光轩(1991-),男,博士生.研究方向:地下工程水害治理理论及工程应用.E-mail:1085361636@qq.com
引用文本:
朱光轩,张庆松,冯啸,刘人太,张连震,刘诗群,张建伟.基于颗粒吸附概率模型的渗透注浆滤过机制研究[J].工程科学与技术,2020,52(5):125-135.
ZHU Guangxuan,ZHANG Qingsong,FENG Xiao,LIU Rentai,ZHANG Lianzhen,LIU Shiqun,ZHANG Jianwei.Study on the Filtration Mechanism in Permeation Grouting Using the Particle Deposition Probability Model[J].Advanced Engineering Sciences,2020,52(5):125-135.