引气剂在盾构隧道注浆材料中的应用研究OA

To explore the effects of synchronous grouting on tunnel structure uplift and ground settlement,this study proposes an improved grouting material to optimize construction performance.Microbubbles were intro-duced into the grout by adding an air entraining agent,endowing the grout with lightweight,elastic and compress-ible properties.A combination of laboratory experiments and field monitoring was employed to evaluate the influ-ence of air entraining agent content on grout properties and construction performance.A lightweight,elastic,and compressible synchronous grouting material for shield tunnels based on the air entraining agent was developed.The study revealed that under identical grouting pressure and volume conditions,the lightweight grouting material effectively suppressed tunnel uplift during construction,reducing the average uplift from 8.7 mm to 0.1 mm.Addi-tionally,ground settlement over 14 d decreased from 10.5 mm to 4.5 mm,a reduction of approximately 57%.The air-inducing effect of the air entraining agent enables grout lightweighting and enhances its performance,sig-nificantly mitigating tunnel uplift and ground settlement during shield tunnel construction.This provides an effi-cient grouting material solution for tunnel engineering projects.