Experimental Study on Environment Friendly Slurry for Slurry Shield Tunnelling

Abstract:

Based on water,clay,starch and minor solid alkali,an environment friendly slurry for slurry shields driving in sandy soils was invented by using the gelatinization property of starch.The true triaxial test coupled SteREO Discovery (V12) were performed to explore the mechanical property of an environment friendly slurry under the complicated stress state.And the mesostructure of a tight membrane and filter cake even in sandy soils were also observed.Experimental results indicate that the environment friendly slurry is characterized by short formation time,compact structure,strong infiltration capacity and wide area with respect to effective support pressure of the slurry.Furthermore,under the drained or undrained condition,the permeability of slurries has great effect on the strength and deformation of sandy soil,and the effective support pressure of slurries has an upper and lower limit value.

Key words:slurrytype shield; slurry; true triaxial test; effective slurry support pressure; mesostructure