Influence of Grout Viscosity on the Grouting Reinforcement Effect of Completely Weathered Granite

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China Journal of Highway and Transport ›› 2018, Vol. 31 ›› Issue (10) : 246-254.

YANG Lei¹, LIN Rong-feng¹, LI Zhao-feng¹, LI Shu-cai¹, ZHANG Qing-song¹, LIU Ren-tai¹, ZHANG Xiao¹, WANG Kai¹, CHEN Hui²

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Abstract

Cement grout is a commonly used grouting material for water disaster control and ground reinforcement in various tunnel and underground engineering applications. Due to the limitations of the conventional method in viscosity adjustment of cement grout by changing the water-cement ratio, this study selected the cement grout with a fixed 1:1 water-cement ratio as the research object, and two types of admixtures were used to adjust the properties of the cement grout, to realize the aim of dynamic regulation of the grout's viscosity and fluidity to a certain extent. The typical completely weathered granite was used as a model medium to conduct the grouting experiment, and the diffusion rules of cement grouts with varying viscosities in the completely weathered granite, as well as the influence of grout viscosity on the reinforcement effect, were investigated. The experimental results indicate that the diffusion of cement grout in the completely weathered granite strata presents a fracturing propagation mode; with the increase in the grout viscosity, the pattern of the grout vein transforms gradually from the "three-bifurcation" type to the "polygonal-line" type, and the thickness of the primary grout vein gradually increases. Moreover, an increasing grout viscosity results in the improvement of the overall reinforcement effect, mainly in terms of the compressive and shear strengths of the grouted medium. In addition, as the slurry viscosity reaches 24.6 s, the uniaxial compressive strength of the reinforced soil mass increases by 87%, and the shear strength parameters of cohesive force and internal friction angle increase by 220% and 46.6%, respectively. The change trend of the internal friction angle and the shear strength is basically consistent, which indicates that the increase in the internal frictional angle is a key factor to affect the overall shearing properties of the medium. It is also noted that the viscosity corresponding to approximately 18.8 s is a sensitive value for predicting the change in the grout vein pattern and the variation of rate of improvement of the grouted medium strength. This research can provide references for grout material selection, viscosity regulation, and the evaluation of reinforcement effect in the grouting engineering of completely weathered granite and similar strata.

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tunnel engineering / grouting reinforcement / grouting experiment / completely weathered granite / cement grout / viscosity

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YANG Lei, LIN Rong-feng, LI Zhao-feng, LI Shu-cai, ZHANG Qing-song, LIU Ren-tai, ZHANG Xiao, WANG Kai, CHEN Hui. Influence of Grout Viscosity on the Grouting Reinforcement Effect of Completely Weathered Granite[J]. China Journal of Highway and Transport, 2018, 31(10): 246-254

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Received	Published
2017-12-15	2018-10-20
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2018-11-07

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