Method for improving residue soil for shield excavation of water-rich weathering uneven slate interaction formation

Abstract

The invention discloses a method for improving residue soil for shield excavation of a water-rich weathering uneven slate interaction formation. Through a cutterhead panel injection channel and holes in various spiders in front of a shield cutterhead, high-concentration foams are injected into the residue soil by a foam mixing and generating system; and through an injecting channel and holes in a soil bin, low-mixing-amount high-molecular polymer is injected to the residue soil by a polymer injecting system so as to implement combined injection.

Description

technical field [0001] The invention relates to the technical field of improvement of shield dregs, in particular to a method for improvement of dregs for shield excavation in water-rich weathered heterogeneous slate interactive strata. Background technique [0002] Slag improvement means that in order to make the slag formed by the cutting of the shield machine cutter head have good flow plasticity, suitable consistency, low water permeability and low frictional resistance, the special adding device for the shield machine is added to the front of the cutter head, The additive is injected into the soil bin and the screw conveyor, and the additive is fully mixed with the muck by using the rotary stirring of the cutter head, the stirring device of the soil bin, and the rotating agitation of the screw conveyor, so as to improve the properties of the muck and facilitate the earth pressure balance of shield tunneling. The role of tunneling control. [0003] The main purpose of m...

AI Technical Summary

Problems solved by technology

Especially in the front and above of the cutterhead, void areas, void zones or water-permeable passages are formed. If there is continuous hydraulic supply in the formation, the risk is higher. Long-term pressure-holding tunneling

[0014] The formation has well-developed joints and fissures, good water permeability, high permeability coefficient, low rock strength, full and strongly weathered layers are easily cemented when exposed to water, and the muck has cementation properties. The cutter head has high excavation torque and thrust. Mud cakes and piles are easy to form at the partition of the soil bin, and the frictional resistance is large, and the hob is easy to be worn

The slag discharge of the screw machine is characterized by segregation of mud and water, the slag body is viscous and cemented into agglomerates, and the fragmented slag body is less. When the screw machine spews out, it is prone to poor soil discharge and low excavation efficiency.