Shield synchronous grouting slurry

Abstract

The invention belongs to novel materials in tunnel construction, in particular to shield synchronous grouting slurry capable of effectively controlling stratum displacement caused by shield construction and tunnel floating after escaping from the shield tail. The properties of the novel shield synchronous grouting slurry material relate to the control of stratum settlement caused by shield construction, the tunnel floating after escaping from the shield tail, and the long-term stability of the tunnel. The invention aims at overcoming the shortcoming in condensation time of conventional single-fluid activity and inertia material, mainly adopts yellow sand, lime putty and fly ash, and adds proper amount of additives to prepare the high-quality synchronous grouting material with high density, high early strength, small shrinkage deformation, good fluidity, good filling property, good stability, seismic resistance and no liquefaction. By the application of the synchronous grouting slurry in engineering test, the invention effectively controls the ground settlement and the tunnel floating after escaping from the shield tail, simultaneously excellent performance and construction effect of the synchronous grouting material obtain general consent from the building side and the construction side, and the synchronous grouting slurry has practicality and promotion value.

Description

technical field [0001] The invention belongs to new materials for tunnel construction, in particular to a novel shield synchronous grouting grout capable of effectively controlling stratum displacement caused by shield construction and the uplift of the tunnel after the tunnel escapes from the tail of the shield. Background technique [0002] The shield synchronous grouting technology refers to that in the process of shield tunneling construction, after the tunnel lining segments are assembled and the tunnel comes out of the shield tail, under a certain grouting pressure, a certain amount of grouting will have a certain early strength and final strength. The grouting material is filled into the gap behind the tail of the shield, and after it is consolidated and hardened, it can fill the building gap behind the wall, provide a certain bearing capacity, and stabilize the segment lining. The types of shield tail grouting are divided into after-the-fact grouting, synchronous gro...

AI Technical Summary

Problems solved by technology

Its disadvantages are low strength in the early stage, lack of chemical stability in the later stage, and easy segregation. It cannot effectively control the buoyancy of the tunnel after it breaks away from the shield tail and maintain the longitudinal stability of the tunnel in the later stage.