一种富水砂层新型盾构环保泥浆配制及其性能研究OA

To address the performance deficiencies and environmental concerns associated with bentonite slurry used in earth pressure balance(EPB)shield tunneling in water-rich sand strata,this study developed an environmentally friendly,high-performance slurry.Through single-factor and orthogonal tests,the effects of seven additives on key performance indicators such as viscosity,fluid loss,pH value,and colloid rate were systematically evaluated.The results indicate that sodium alginate(SA)is most effective in increasing viscosity,carboxymethyl starch(CMS)excels in reducing fluid loss,and guar gum possesses both functions.Leveraging the synergistic effects among additives,the optimal slurry formulation was determined as water:bentonite:guar gum:SA:CMS=1 000:150:0.2:0.6:2(mass ratio),with CMS dosage controlled to maintain pH<10.At a 10％incorporation ratio of this optimal slurry,the conditioned muck exhibited the best plastic flow behavior,a significantly reduced internal friction angle,and a permeability coefficient as low as 5.3×10⁻⁷ m/s,demonstrating superior performance compared to traditional bentonite slurry.This research provides an efficient and eco-friendly slurry formulation for EPB shield construction in water-rich sand strata,contributing to the green and sustainable development of slurry technology.