###

←前一篇   |   后一篇→

(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)

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.

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.