Open Access

ARTICLE

Investigation of the Mechanism of Grout Penetration in Intersected Fractures

Yanxu Guo¹, Peng Zhao², Qingsong Zhang¹, Rentai Liu^1,*, Lianzhen Zhang³, Yankai Liu¹

1 Geotechnical and Structural Engineering Research Center, Shandong University, Jinan, 250061, China.
2 Powerchina Huadong Engineering Corporation Limited, Hangzhou, 311122, China.
3 College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao, 266580, China.

* Corresponding Author: Rentai Liu. Email: .

(This article belongs to the Special Issue: EFD and Heat Transfer)

Fluid Dynamics & Materials Processing 2019, 15(4), 321-342. https://doi.org/10.32604/fdmp.2019.07844

Abstract

To study the penetration mechanism of cement-based slurry in intersected fractures during grouting and the related pressure distribution, we have used two different variants of cement, namely, basic cement slurry and fast-setting cement slurry. The influence of a retarder, time-varying viscosity, fracture width and location of injection hole is also considered. A finite element software is used to implement two and three-dimensional numerical models for grouting of intersected fractures in hydrostatic conditions. Results show that there are significant differences in the diffusion morphology and pressure distribution depending on the considered cement slurry. Retarder can effectively slow down the rising rate of injection pressure and extend the diffusion distance of grout. The influence of the branch fracture is more important when basic cement slurry is considered, indicating that the change of grout pressure is correlated with the slurry viscosity. The faster the viscosity increases, the less evident is the effect.

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