CN105156122A - Muck improvement method for shield driving of water-rich slate and sandy gravel compound stratum - Google Patents

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

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Publication number
CN105156122A
CN105156122A CN201510321357.4A CN201510321357A CN105156122A CN 105156122 A CN105156122 A CN 105156122A CN 201510321357 A CN201510321357 A CN 201510321357A CN 105156122 A CN105156122 A CN 105156122A
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China
Prior art keywords
foam
slate
sandy gravel
improvement method
water
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Pending
Application number
CN201510321357.4A
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Chinese (zh)
Inventor
张雨
刘双全
项瀚仪
龙长喜
刘莎莎
孙晓鹏
李烺
綦兴南
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Beijing Urban Construction Group Co Ltd
Beijing Urban Construction Design and Development Group Co Ltd
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Beijing Urban Construction Group Co Ltd
Beijing Urban Construction Design and Development Group Co Ltd
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Application filed by Beijing Urban Construction Group Co Ltd, Beijing Urban Construction Design and Development Group Co Ltd filed Critical Beijing Urban Construction Group Co Ltd
Priority to CN201510321357.4A priority Critical patent/CN105156122A/en
Publication of CN105156122A publication Critical patent/CN105156122A/en
Pending legal-status Critical Current

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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

A kind of rich water slate and sandy gravel compound stratum shield driving sediment improvement method
Technical field
The present invention relates to shield structure sediment improvement technical field, particularly relate to a kind of rich water slate and sandy gravel compound stratum shield driving sediment improvement method.
Background technology
Sediment improvement refers to that the dregs in order to make shield cutter cut formation has good stream plasticity, suitable denseness, lower water permeability and less frictional resistance, the adding set special by shield structure injects additive in cutterhead front, Tu Cang and conveying worm, the Stirring of cutterhead, native storehouse mixing plant is utilized to stir and conveying worm Stirring, additive is fully mixed with dregs, improve dregs proterties to reach, be beneficial to the effect of earth pressure balanced shield, EPBS digging control.
The main purpose of sediment improvement:
(1) make dregs have good stream plasticity, be beneficial to the realization of earth pressure balance effect, be beneficial to and control soil pressure, stablize excavation face, control stratum settlement;
(2) make dregs have good sealing, be beneficial to the water permeability lowering dregs, reduce stratum soil erosion, reduce dregs segregation or screw machine spewing phenomenon.
(3) make dregs have good mobility, workability and row property, be beneficial to conveying worm deslagging, reduce dregs deposition consolidation, reduce the formation of mud cake.
(4) make dregs have lower rub rent power and adhesion strength, be beneficial to and effectively reduce cutterhead and conveying worm moment of torsion, reduce the wearing and tearing to cutter and spiral, improve shield driving parameter, improve drivage efficiency.
When Shield Tunneling scope and vault superstratum are rich water slate and sandy gravel mutual stratum, the master stratum on this stratum is characterized as: arch and vault superstratum are sandy gravel, and underlying strata is strong, middle wind slap.Boulder bed invades the uneven thickness of excavated section, and two class stratum are compound stratum proterties.
On to cover cobble content in sand-pebble layer high, quartzite cobble particle diameter about 20-80mm, content 50-70%, remaining is circle gravel and medium coarse sand, saturated.Cobble uniaxial compressive strength is high, large to shield cutter wearing and tearing; Sand pebble layer is loose, poor stability, and be subject to disturbance during driving, sedimentation is wayward, easily loosens and caves in; Sand pebble layer transmission coefficient is high, and in saturation state, good water permeability, tax water-holding quantity are large; Sandy gravel angle of internal friction is large, workability and poor fluidity, and frictional resistance is large, and cutter head torque easily increases.
Severely-weathered slate stratum of underliing is excavation scope main composition, and local, bottom is middle wind slap.Severely-weathered slate is cataclastic texture, and lamelliform constructs, cranny development, and core is fragment shape, chunky shape, and immersion is softening disintegration easily.Middle wind slap lamellar structure, bedding and joint fissure are comparatively grown, and mineral are mainly mica, quartz, and local horsestone English vein, core is pie, short cylinder.Because slate meets the easy softening transform of water, disintegration, intensity and supporting capacity die-off, and this bedded joint cranny development, water permeability is stronger, rock stratum pore water enriches, and under cutterhead excavation and agitated conditions, face easy disintegrating caves in, appearance is come to nothing, and under repeatedly stirring, meets water softening and becomes muddy, adhesion strength is strong, and cutter head torque is large, cutterhead and the easy mud lining of Tu Cang, dregs poor fluidity, belt deslagging difficulty, easily bonds, fall mud, drivage efficiency is low, and construction environment is poor.
Under two class stratum complex characters, rich groundwater in addition, the general characteristic of this stratum driving is: bed boundary is unstable, critical surface poor stability, and face self-stable ability is poor, easy avalanche, comes to nothing, so that surface settlement is larger; Greatly, deslagging is difficult, easy mud lining for cutterhead and screw machine moment of torsion; Tool wear is serious, and the tool changing condition that opens a position is poor; Overall drivage efficiency is low, and settlement Control difficulty is large.
Therefore wish that a kind of rich water slate and sandy gravel compound stratum shield driving sediment improvement method overcome or at least alleviate above-mentioned defect.
Summary of the invention
The object of the present invention is to provide a kind of rich water slate and sandy gravel compound stratum shield driving sediment improvement method to overcome the above-mentioned problems in the prior art.
For achieving the above object, the invention provides a kind of rich water slate and sandy gravel compound stratum shield driving sediment improvement method, by the injection hole on cutter head panel filling passage and each spoke arm in cutterhead front, adopt foam mix generation systems to dregs filling high concentration foam.
Preferably, the additive of described high concentration foam forms by surfactant, stabilizing agent, hardening agent and bleeding agent are composite, and carrier is water.
Preferably, the consistency of foam of described high concentration foam: 4-5%; Stratum injection rate (FIR): 50-60%; Foam Expansion rate (FER): 1:14-1:16.
Preferably, the quantity of described cutter head panel filling passage is 3-5 road.
Preferably, the quantity of described injection hole and position, select according to the distance of shield tunneling locus of radius and the even angle of cutterhead spoke arm.
The invention provides a kind of rich water slate and sandy gravel compound stratum shield driving sediment improvement method, the method has following beneficial effect: 1. close excavation face and stratum, arch, and reducing comes to nothing caves in, control settlement; Improve the sealing of dregs, reduce excavation face water permeability, reducing the erosion of underground water on excavation face and stratum, arch affects, and keeps excavation face self-stability; 2. increase dregs row property, reduce and adhere to, prevent mud lining, reduce cutterhead excavation moment of torsion and conveying worm moment of torsion; 3. realize lubrication and cooling to cutter, spiral, reduce the mill of sandy gravel to cutter and spiral.The method improve shield driving parameter, improve drivage efficiency, and improve the defective mode of dregs, improve its mobility, be beneficial to set up earth pressure balance effect.
Detailed description of the invention
In the present invention one broad embodiment, a kind of rich water slate and sandy gravel compound stratum shield driving sediment improvement method, by the injection hole on cutter head panel filling passage and each spoke arm in cutterhead front, adopt foam mix generation systems to dregs filling high concentration foam.
Sediment improvement material generally has surfactant-based (as foaming agent), mineral substance (as clay or swell soil), high score subclass (as polymer) and other compound adding materials.Its filling position is generally the injection hole be distributed on cutter head panel, native storehouse dividing plate and screw machine cylindrical shell, its material selection and charging method should consider according to the characteristic sum Suporting structure ability on driving stratum and configuration feature, generally compound should be taked to add for bad ground, the principle that multipath injects, namely two or more additive material is chosen, suitable position, hole is selected at cutterhead, Tu Cang and screw machine place, according to rational dispense path, according to respective add-on system and approach, combine injection, to obtain good improved effect simultaneously.
High concentration foam forms by kinds of surface activating agent, stabilizing agent, hardening agent and bleeding agent etc. are composite, and carrier is water.As the surfactant of expanding foam solution main component, be made up of the long-chain molecule be polymerized, containing hydrophobic group and hydrophilic group, the action effects such as infiltration, emulsification, foaming, antifriction can be played.Mix with water in the course of the work, by compressed air, through foam-making apparatus, expansion of liquids is made to produce foam, be injected in shield cutter, Tu Cang and conveying worm, to improve the physically-based model of the excavation face soil body further, increase its plastic fluidity and sealing, prevent cutting native sand and stick in cutterhead and conveying worm, avoid occlusion phenomena, alleviate mechanical load, reduce cutter head torque and thrust, play the effect of soil improvement.
Foam is typical solution-air two phase system, and it more than 90% is air, and 10% is foaming agent solution; And foaming agent solution 90% ~ 99% is water, all the other are foaming agent stoste.
(1) surface tension reduces.The surface coverage of water layer of surface activating agent, its hydrophobic group contacts with air, thus reduce the surface tension of water.
(2) adsorptivity.When surfactant adds in liquid, it can be adsorbed on solid-liquid, and on the interface of fluid-gas and different liquids, formation aligns, and forms adsorbed film.
(3) lubrication.Capillary reduction adds lubrication.Flowing due to Bound moisture makes the soil particle of original combined water constraint flow freely.
(4) electrostatic repulsion.The grogs combined by electrostatic force is separated.The surface of SURFACTANT ADSORPTION minute crack in the soil body, increases the degree of depth in crack, weakens the healing ability of minute crack, enhanced diffustion ability, and soil particle is repelled mutually with identical electric charge.
(5) compactness adding the mixing soil body of foam has larger change, partial particulate in foam displaces dregs and moisture, composite soil bulk density is reduced, reduce the contact between particle, bubble serves certain lubrication, reduce the roughness of contact surface, reduce inner frictional resistance.Improve the sealing of the soil body simultaneously, reduce the permeability of the soil body.
(6) the foams mix soil body has certain elasticity, strength and stiffness, contributes to the soil pressure maintaining native storehouse necessity, and makes its even variation.
The effect of foam in sediment improvement
(1) make the strength and stiffness of the excavation face soil body be strengthened, be beneficial to and set up soil pressure, safeguard excavation face stability, control stratum settlement.
(2) foam has good greasy property and certain intensity, elasticity, can reduce the angle of internal friction of the soil body in storehouse, improves the stream plasticity of the soil body in native storehouse, is beneficial to stable soil pressure, realizes earth pressure balance, safeguards that excavation face is stablized; Be beneficial to the mobility improving the excavation soil body, increase the row property of dregs, make Tu Cang and spiral casting unobstructed; Prevent " obturation " phenomenon from occurring; Foam has compressibilty, can improve the compressibilty of the spoil after improvement, suppresses the generation of " mud cake " problem, reduces the moment of torsion of cutterhead and conveying worm, improves boring parameter; Absorption bubble between particles can reduce the direct friction of soil body particle and cutter disc system, is beneficial to the wearing and tearing reducing cutterhead, cutter and conveying worm, cooling cutter.
(3) foam can replace the water in soil particle gap, is beneficial to the permeability reducing dregs, improves its sealing, and reduce underground water and run off, minimizing is gushed.
(4) in loose sand-pebble layer, can fill and replace sand particles gap, increase the cohesion between particle, improve the force-bearing situation of the soil body, make soil body power transmission even, be beneficial to adjustment support pressure, ensure stable driving, simultaneously because of its good diffusivity and permeability, under the stirring of cutterhead, rapid permeability is in dregs, and parcel sandy gravel particle, reduces the compactness of the soil body, improve the stream plasticity of the soil body, reduce excavation moment of torsion.
Verify through on-the-spot routine test, determine in rich water sandy gravel and slate compound stratum, because of its rich groundwater, therefore take high concentration foam, and suitably improve Foam Expansion rate, reinforced foam stability, postpone to be dissipated as important indicator, the interpolation foam volume proportioning matched with driving speed and actual formation feature is as follows:
Consistency of foam: 4%; Stratum injection rate (FIR): 50%; Foam Expansion rate (FER): 1:14.
Consistency of foam: 5%; Stratum injection rate (FIR): 60%; Foam Expansion rate (FER): 1:16.
Consistency of foam: 4.5%; Stratum injection rate (FIR): 55%; Foam Expansion rate (FER): 1:15.
Injection hole on each spoke arm in cutterhead front, according to stratum injection rate, filling passage can select 3 ~ 5 tunnels, and choose reasonable injects hole count and position simultaneously, by distance and the selection of spoke arm even angle of excavation locus of radius.
By adding the high concentration foam improvement soil body, dregs stream plasticity significantly improves, and cutter head torque and thrust drop to reasonable interval, and boring parameter is greatly improved, and enhances construction continuity, improves drivage efficiency.Excavation face disintegration is come to nothing minimizing, and stratum settlement is controlled.Dregs temperature reduces, and tool abrasion declines.
Finally it is to be noted: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit.Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.

Claims (5)

1. rich water slate and a sandy gravel compound stratum shield driving sediment improvement method, is characterized in that, by the injection hole on cutter head panel filling passage and each spoke arm in cutterhead front, adopts foam mix generation systems to dregs filling high concentration foam.
2. rich water slate as claimed in claim 1 and sandy gravel compound stratum shield driving sediment improvement method, it is characterized in that, the additive of described high concentration foam forms by surfactant, stabilizing agent, hardening agent and bleeding agent are composite, and carrier is water.
3. rich water slate as claimed in claim 2 and sandy gravel compound stratum shield driving sediment improvement method, is characterized in that, the consistency of foam of described high concentration foam: 4-5%; Stratum injection rate (FIR): 50-60%; Foam Expansion rate (FER): 1:14-1:16.
4. rich water slate as claimed in claim 1 and sandy gravel compound stratum shield driving sediment improvement method, is characterized in that, the quantity of described cutter head panel filling passage is 3-5 road.
5. rich water slate as claimed in claim 1 and sandy gravel compound stratum shield driving sediment improvement method, is characterized in that, the quantity of described injection hole and position, selects according to the distance of shield tunneling locus of radius and the even angle of cutterhead spoke arm.
CN201510321357.4A 2015-06-12 2015-06-12 Muck improvement method for shield driving of water-rich slate and sandy gravel compound stratum Pending CN105156122A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109944599A (en) * 2019-03-12 2019-06-28 北京市政建设集团有限责任公司 A method of it is excessive to solve shield dregs water content
CN111305854A (en) * 2019-12-28 2020-06-19 北京市政建设集团有限责任公司 Method for solving problem of sludge cake rich in HBW grease in shield tunneling of sandy cobble stratum
CN113775347A (en) * 2021-11-10 2021-12-10 北京城建集团有限责任公司 Muck improvement method based on cobble rock stratum shield engineering characteristic classification

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109944599A (en) * 2019-03-12 2019-06-28 北京市政建设集团有限责任公司 A method of it is excessive to solve shield dregs water content
CN111305854A (en) * 2019-12-28 2020-06-19 北京市政建设集团有限责任公司 Method for solving problem of sludge cake rich in HBW grease in shield tunneling of sandy cobble stratum
CN113775347A (en) * 2021-11-10 2021-12-10 北京城建集团有限责任公司 Muck improvement method based on cobble rock stratum shield engineering characteristic classification

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