Abstract: To study the influence of fine particle formation on the treatment of slurry and water for largediameter shield tunneling, the working principle, equipment parameters, treatment effect, treatment capacity and influencing factors of centrifuge and pressure filter are introduced by taking Wangjing tunnel of BeijingShenyang passengerdedicated line. Moreover, the slurry treatment effect of slurrywater separation technology under different slurry proportions and admixtures in different strata is studied based on geological conditions (sand, clay) in Beijing. The results show that by choosing appropriate parameters, equipment configuration, operating parameters and admixtures, the fine particles with diameter smaller than 20 μm can be effectively processed, the slurry index can be controlled, and slurry cyclic utilization, "zero emission and zero pollution" can be achieved.

Key words: slurry shield, slurrywater separation, centrifugal separation, pressure filtration separation, clay stratum, sand stratum, admixtures