Journal of Shandong University(Engineering Science) ›› 2020, Vol. 50 ›› Issue (5): 20-25.doi: 10.6040/j.issn.1672-3961.0.2019.746

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Variation of granular slurry diffusion distance in sand medium

FENG Xiao1, XIA Chong1, WANG Fenggang2, ZHANG Bing2   

  1. 1. School of Transportation Engineering, Shandong Jianzhu University, Jinan 250101, Shandong, China;
    2. Jinan Liwen Geotechnical Engineering Co., Ltd., Jinan 250101, Shandong, China
  • Published:2020-10-19

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Abstract: Based on the mass conservation equation, linear filtration law, Darcy's law and specific boundary conditions, a theoretical diffusion distance model of granular slurry under laminar flow conditions was established. By developing and applying an assembly-type device for permeating grouting, the diffusion rules of grout under different water-cement ratio and flow rate were studied. The value of model test was compared with the theoretical values when the filtration effect was considered or not. The results showed that when the flow velocity v0 was constant, the theoretical diffusion distance without filtration effect considered was not consistent with reality. Both the water-cement ratio and velocity of grout were positively correlated with diffusion distance. When the water-cement ratio was 1∶1, the deviation between the value of model test and the theoretical calculation with filtration considered was 18.4 to 20.8 cm, with a deviation rate of 68.9% to 71.9%. When the water-cement ratio came to 2 ∶1, corresponding values were within 20.7 to 23.4 cm, and 27.0% to 28.2% respectively. The research results could guide the drilling spacing design of grouting and had some application value for project.

Key words: sand layer, granular slurry, osmotic grouting, filtration effect, diffusion distance

CLC Number: 

  • TU581
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