Experimental Study on Ratio of Drag Reducing Mud in Expansive Soil Area
The development of underground spaces is advancing towards larger cross-sections and longer distances,with jacking force increasing proportionally to the jacking distance.Therefore,effectively controlling the jacking force has become essential.Anti-friction slurry,as a crucial construction material,plays a role in reducing friction,providing lubrication,and supporting the surrounding strata,with its performance directly affecting construction outcomes.Relying on the shallow-buried tunnel section of Luzhou Avenue in the Binhu Science City of Hefei,this study focuses on optimizing the anti-friction slurry mix ratio for expansive soil areas to enhance the efficiency of large-section pipe-jacking construction.Using orthogonal experiments,the effects of bentonite,carboxymethyl cellulose(CMC),and soda ash on the slurry's anti-friction performance were studied.Funnel viscosity,water separation rate,and water loss were tested to evaluate the performance.The results showed that increasing the bentonite content significantly reduces water loss and water separation rates,but excessive amounts decrease fluidity.A CMC content of 0.1%achieves the lowest water separation rate,while soda ash demonstrates optimal performance at a content of 0.3%.The final optimal mix ratio was determined as bentonite∶CMC∶soda ash=8%∶0.1%∶0.3%,providing a reliable formula for pipe-jacking construction in expansive soil areas.
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万方数据
维普
