基于颗粒吸附概率模型的渗透注浆滤过机制研究
Study on the Filtration Mechanism in Permeation Grouting Using theParticle Deposition Probability Model
作者：朱光轩(山东大学 岩土与结构工程研究中心)；张庆松(山东大学 岩土与结构工程研究中心)；冯啸(山东建筑大学 交通工程学院)；刘人太(山东大学 岩土与结构工程研究中心)；张连震(山东大学 岩土与结构工程研究中心)；刘诗群(青岛地铁集团)；张建伟(青岛地铁集团)
Author：zhu guangxuan()；()；FENG Xiao()；()；()；()；()
收稿日期：2019-08-16 年卷（期）页码：2020,52(5):-
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：渗透注浆;沉积概率模型;滤过效应;柱形扩散;水泥浆液
Key words：permeation grouting; deposition probability model; filtration effect; radial diffusion; cement grout
基金项目：国家自然科学基金联合(U1706223)；国家自然科学基金(51779133)；国家自然科学基金(51879152)
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。基于一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。开展了三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。
英文摘要
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 assume the coefficient as a constant, which has 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 describes the filtered process of cement particles in porous media. In addition, the determination method of model parameters is proposed. 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 results show 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 of the model is less than 12%, and the maximum calculation error of grouting pressure is less than 14.2%. The model can describe the radial diffusion process of cement slurry well.
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