Seepage characteristics of slurry and its influence on ground strength of slurry shield in sand
CAOLiqiang
ZHANGDingli
FANGQian
SUWei
LIAOJunhua
Abstract：During slurry shield tunneling,a filter cake with low permeability will be formed on the working face when pressurized slurry infiltrates into the stratum.To ensure the stability of the working face,the slurry pressure which acts on the filter cake that is almost impervious to water to counteract the soil pressure and water pressure.Based on the Nanjing Weisan road river-cross-ing tunnel,three kinds of stratums with different grain size and gradations are picked to carry out a model experiment about pressurized slurry infiltrating into the stratum and to investigate the seepage characteristics and the influence law caused by infiltration of ground strength.According to the results,the permeability coefficient is an important factor influencing the permeability depth and the quality of the filter cake.The permeability depth and the amount of infiltration wa-ter both present a linear relationship with the permeability coefficient.The shear strengths altered by water and slurry show different change laws with the variation of grain size.The research can provide some references for reasonable slurry pressure of slurry shield.
Keywords：slurry shieldfilter cakeseepage characteristicsshear strength
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 7-13,31 )