Abstract:In view of the current shortcomings of the slurry shield chamber-filling method for opening the chamber in fractured and permeable strata, such as long construction period and high cost, the technical feasibility of preparing the fluidized curing materials by adding the curing agents into multiphase slurry from shield chambers is explored. Taking the chamber slurry as the base material, the fluidized soils with the different proportions are prepared by adding the different ratios of curing agents and polymer materials. And the fundamental performance test of fluidized soil, the natural flow-filling simulation test, the simulation test of fluidized state curing under pressure and the polymer slurry fluidized curing ratio test are carried out to comprehensively evaluate its fluidity and consolidation effects. The experimental results show that the slurry-based fluidized curing soil has the good fluidity and the early-stage strength can meet the chamber-filling requirements, which can effectively fill the weathered rock crevices under both natural and pressurized conditions. The slurry mixed with the polymer materials can significantly reduce the curing agent consumption. The technical approach of utilizing in-chamber slurry to prepare the fluidized curing materials is feasible for chamber-opening operations, which has the advantages of local material utilization, construction convenience and cost effectiveness. However, it is necessary to further study the impacts of varying geological conditions and stratum organic matter contents on curing effects.
