Muck improvement method for shield driving of water-rich slate and sandy gravel compound stratum

Abstract

The invention discloses a muck improvement method for shield driving of a water-rich slate and a sandy gravel compound stratum. The method is characterized in that through filling channels of a cutter panel and injection holes on each spoke arm in front of a cutter, a foam blending generation system is used to fill high-concentration foam to muck.

Description

technical field [0001] The invention relates to the technical field of shield tunneling dreg improvement technology, in particular to a method for improving dregs for shield tunneling in composite strata of water-rich slate and sand pebbles. 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...

AI Technical Summary

Problems solved by technology

Because slate is easy to soften, deform and disintegrate when exposed to water, its strength and bearing capacity are suddenly reduced, and the joints and fissures in this layer are well developed, with strong water permeability and rich pore water in the rock formation. Disintegrates and collapses, voiding occurs, under repeated agitation, it softens into mud when it encounters water, strong adhesion, large cutter head torque, easy to form mud cake on cutter head and soil bin, poor fluidity of muck, difficult to discharge slag by belt, easy Bonding, mud drop, low excavation efficiency, poor construction environment

[0011] Under the complex properties of the two types of strata, coupled with abundant groundwater, the general characteristics of the excavation in this stratum are: the stratum interface is unstable, the stability of the critical surface is poor, the self-stabilization ability of the face is poor, and it is easy to collapse and void, resulting in large ground subsidence; The torque of the cutter head and screw machine is large, it is difficult to discharge slag, and it is easy to form mud cakes; the tool wear is serious, and the conditions for opening and changing tools are poor; the overall excavation efficiency is low, and the settlement control is difficult