Abstract
Large-diameter slurry shield tunneling generates substantial amounts of slurry during construction. To reduce disposal costs of waste slurry and achieve resource utilization while addressing grouting reinforcement requirements in silt soil strata, this study systematically investigated the influence of waste slurry content and AB liquid volume ratio on grout performance using response surface methodology and various analytical methods. The results reveal the effects of slurry content and AB liquid volume ratio on two-component grout properties: increasing waste slurry content decreases grout density and increases consistency, while causing bleeding rate and fluidity to first decrease then increase, and initial setting time to first increase then decrease; increasing the AB liquid volume ratio enhances fluidity and consistency, and prolongs initial setting time. The interaction effects between slurry content and AB liquid volume ratio on grout performance were clarified. A practical mix ratio suitable for silt soil strata was proposed: Liquid A consists of cement 123.46 kg/m³, fly ash 100 kg/m³, sand 210.05 kg/m³, water 135.19 kg/m³, and slurry 58.1 kg/m³; Liquid B is 40°Bé sodium silicate; the volume ratio of Liquid A to Liquid B is 30:1.
Full Text
Preamble
Title: Experimental Study on the Performance of Cement-silicate Grouting Prepared by SPB Shield Slurry Based on Response Surface Methodology
Method
Author: Guo Fei (China Railway Guangzhou Group Co., Ltd., Guangzhou 510088)
Abstract
Large-diameter slurry shield tunneling generates substantial quantities of waste slurry. To reduce disposal costs and enable resource utilization of this waste material, while simultaneously addressing the need for grouting reinforcement in silt soil layers, this study employs response surface methodology combined with multiple analytical techniques to systematically investigate how waste slurry content and AB liquid volume ratio affect grout performance.
The results reveal the influence mechanisms of these factors on two-component grout properties. Increasing waste slurry content reduces grout density and increases consistency, while causing both bleeding rate and fluidity to initially decrease and subsequently increase; initial setting time follows the opposite trend, first increasing then decreasing. An increased AB liquid volume ratio enhances fluidity and consistency while prolonging initial setting time. The study also clarifies the interactive effects between slurry content and AB liquid volume ratio on grout performance.
A practical mix proportion suitable for silt soil layers is recommended: Solution A contains cement (123.46 kg/m³), fly ash (100 kg/m³), sand (210.05 kg/m³), water (135.19 kg/m³), and slurry (58.1 kg/m³); Solution B is 40°Bé sodium silicate; the volume ratio of Solutions A to B is 30:1.
Keywords: slurry shield; waste slurry; two-component grout; response surface methodology; mix proportion test