Environmentally friendly slurry and rheological properties for slurry shield tunnel
In order to solve the difficult degradation problem of traditional additive sodium carboxymethyl cellulose(CMC)for slurry shields,an environmental friendly slurry with flaxseed gum(natural green vegetable gum)as an additive was proposed.The effect of flaxseed gum on the rheological curve of bentonite slurry was analyzed by rheometer.The variation of yield stress and apparent viscosity under different flaxseed gum content was studied.The effect of CMC and existing green additive guar gum was compared.The mechanism of different additives in slurry was also clarified.The results showed that the three additives could improve the rheological properties of the slurry.The hydrodynamic behavior was well described by Herschel-Bulkley model.The apparent viscosity μ,yield stress τ0 and consistency coefficient k were positively correlated with the additive content C,while the rheological index n was negatively correlated with the content C.When the additive content was constant,the effect of flaxseed gum on the rheological properties of bentonite slurry was similar to CMC and higher than guar gum,which could replace the two as additives for environmental friendly slurry.
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