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

A technology for improvement and weathering of dregs, which is applied in the direction of earth square drilling, mining equipment, tunnels, etc., can solve the problems of strong weathered layers that are easily cemented when exposed to water, high excavation torque of the cutter head, and cementation of dregs, etc. Effects of void collapse, reduction of excavation torque and screw conveyor torque, reduction of adhesion

Inactive Publication Date: 2015-11-11
BEIJING URBAN CONSTR DESIGN & DEV GRP CO +1
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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.

Method used

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Embodiment Construction

[0027] In a broad embodiment of the present invention, a method for improving water-rich weathered heterogeneous slate interactive strata with muck for shield excavation, through the filling channel of the cutter head panel and the holes on the radial arms in front of the shield cutter head, The foam mixing system is used to inject high-concentration foam into the dregs, and at the same time, through the filling channels and holes in the soil bin, the polymer injection system is used to inject low-volume polymers into the dregs for compounding raise.

[0028] Slag improvement materials generally include surfactants (such as foaming agents), minerals (such as clay or bentonite), polymers (such as polymers) and other composite additives. The filling positions are generally the injection holes distributed on the cutter head panel, the soil bin partition and the screw machine cylinder. The material selection and filling method should be comprehensively considered according to the ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D9/08
Inventor 张雨刘双全项瀚仪龙长喜刘莎莎孙晓鹏李烺綦兴南
Owner BEIJING URBAN CONSTR DESIGN & DEV GRP CO
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