Experimental Study on Performance and Grouting Water Plugging Effect of Ultrafine Cement-Sodium Silicate Slurry
The station hall and platform of Gaojiayuan Station on Beijing Metro Line No.14 are connected by a underground channel,which passes through a water-rich silty and fine sand stratum.In order to solve the problem of poor water plugging effect and excessive surface uplift in the underground channel,the scheme of ultrafine cement-sodium silicate slurry grouting to plug water was proposed.Firstly,the fluidity,setting time and consolidated body strength of the slurry were tested,and the mix proportion of ultrafine cement-sodium silicate was determined according to the test results.Liquid A was ultrafine cement slurry with a water-cement ratio of 1.0,liquid B was a sodium silicate with a concentration of 20 °Bé,and the retarder was disodium hydrogen phosphate with a dosage of 2.5%.Liquid A accounts for about 80%of the total grouting amount,and liquid B and retarder each account for about 10%.The relationship between the migration distance of particles of ultrafine cement slurry in the stratum and grouting pressure was studied by the PFC(Particle Flow Code)method.Combined with the results of slurry performance test and numerical simulation,a grouting scheme with a grouting pressure of 0.5 MPa,a grouting hole diameter of 5 cm,a spacing of 50 cm,and a plum blossom-shaped arrangement was proposed.The results of on-site grouting test in the underground channel show that the ultrafine cement-sodium silicate slurry grouting has a good effect on water plugging.
underground channelgrouting water pluggingexperimental studyparticle flow code methodwater-rich silty fine and sand stratumultrafine cement-sodium silicate slurrymix proportion
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维普
