CN105089671A - Muck improvement method for full-section extra-hard diabase stratum shield tunneling - Google Patents

Muck improvement method for full-section extra-hard diabase stratum shield tunneling Download PDF

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Publication number
CN105089671A
CN105089671A CN201510321456.2A CN201510321456A CN105089671A CN 105089671 A CN105089671 A CN 105089671A CN 201510321456 A CN201510321456 A CN 201510321456A CN 105089671 A CN105089671 A CN 105089671A
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China
Prior art keywords
diabase
improvement method
stratum
foam
filling
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CN201510321456.2A
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Chinese (zh)
Inventor
周刘刚
杨凯
恽军
武福美
朱伟
王良
王东清
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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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Priority to CN201510321456.2A priority Critical patent/CN105089671A/en
Publication of CN105089671A publication Critical patent/CN105089671A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a muck improvement method for full-section extra-hard diabase stratum shield tunneling. The muck improvement method comprises the following steps: injecting a channel and a hole in each spoke arm in front of a shield cutter head by virtue of a cutter head panel; injecting high-volume high-molecular polymer into the muck by virtue of a polymer injection system; and carrying out compound injection on the muck by injecting low-concentration foam into the muck through the channel and holes in a muck bin via a foam mixing generating system.

Description

A kind of extremely hard diabase stratum shield driving sediment improvement method of tunneling boring
Technical field
The present invention relates to shield structure sediment improvement technical field, particularly relate to a kind of extremely hard diabase stratum shield driving sediment improvement method of tunneling boring.
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, vault superstratum and substrate underlying strata are the rich water tunneling boring diabase of middle weathering layer equably, because rich water tunneling boring diabase master stratum is characterized as: Fu Shui high-strength pole ground consisting of hard rock, diabase tunneling boring distributes, rock saturation uniaxial compressive strength 140MPa, belong to pole hard rock, cause shield driving difficulty, cutter very easily weares and teares.Face rock stratum is mingled with the weathering thin layer be interspersed, be rich in quartzy vein and metalliferous mineral, cause Rock Joints Surrounding crack obvious, globality is poor, after cutterhead excavation, and face out-of-flatness, sillar charges into cutterhead, add cutter head torque and cutter attack power, cutter inordinate wear is serious, and the tool changing that opens a position is frequent.Rock crack is grown, and crevice water enriches, and supply is abundant, and recharge rate is fast, and have pressure-bearing property, be strong water rich strata, conveying worm is gushed seriously, and screw conveyor mouth rock ballast spray deposition is serious, and fltting speed and efficiency of construction are extremely low.
Therefore wish that a kind of extremely hard diabase stratum shield driving sediment improvement method of tunneling boring overcomes or at least alleviates above-mentioned defect.
Summary of the invention
The object of the present invention is to provide a kind of extremely hard diabase stratum shield driving sediment improvement method of tunneling boring to overcome the above-mentioned problems in the prior art.
For achieving the above object, the invention provides a kind of extremely hard diabase stratum shield driving sediment improvement method of tunneling boring, by the position, hole on cutter head panel filling passage and each spoke arm in shield cutter front, adopt polymer loading system to dregs filling high additive high molecular polymer, meanwhile by the filling passage in native storehouse and position, hole, foam mix generation systems is adopted to carry out compound filling to dregs filling low concentration foam.
Preferably, described high additive high molecular polymer additive comprises: water miscible polyacrylamide particle.
Preferably, the additive of described low concentration foam forms by surfactant, stabilizing agent, hardening agent and bleeding agent are composite, and carrier is water.
Preferably, the quantity of described cutter head panel filling passage is 2 roads or 3 tunnels.
Preferably, the filling number of channels in described native storehouse is 2 tunnels.
Preferably, polymer loading system can also be adopted in screw machine to dregs filling high additive high molecular polymer.
Preferably, the polymer volume of described high additive high molecular polymer: 8-10 ‰, stratum injection rate: 30-35%.
Preferably, the consistency of foam of described low concentration foam: 2%; Stratum injection rate (FIR): 40-50%; Foam Expansion rate (FER): 1:8-1:10
The invention provides a kind of extremely hard diabase stratum shield driving sediment improvement method of tunneling boring, the method reduce spiral and gush, improve dregs stream plasticity, reduce cutter head torque, reduce tool wear, improve drivage efficiency.By good sediment improvement, improve the sealing of dregs, reduce excavation face water permeability, close excavation face crack, increase dregs viscosity and workability, after additive slurries and dregs mix and blend, improve the parcel carrying capacity to dregs, and then reach the segregation weakening dregs, improve the proterties of dregs water, stone separation, improve dregs stream plasticity, reduce spiral and gush and the sprinkling of operation area aggregate chips, improve operating efficiency.Reduce dregs angle of internal friction, lubrication excavation face rock stratum, lubrication and cooling cutter head panel and cutter, alleviate and impact simultaneously, to reduce cutterhead excavation moment of torsion and tool wear, thus reduces the tool changing frequency that opens a position, improve drivage efficiency.
Detailed description of the invention
In the present invention one broad embodiment, a kind of extremely hard diabase stratum shield driving sediment improvement method of tunneling boring is by the position, hole on cutter head panel filling passage and each spoke arm in shield cutter front, adopt polymer loading system to dregs filling high additive high molecular polymer, meanwhile by the passage in native storehouse and position, hole, foam mix generation systems is adopted to carry out compound filling to dregs filling low 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.
Shield driving sediment improvement high molecular polymer additive material is divided into insoluble and water-soluble two large classes.
Insoluble polymer is mainly: super absorbent resin class (SuperAbsorbentPolymer, be called for short SAP), also super-absorbent material is claimed, high water absorbency polymer, is mainly divided into starch based, cellulose family, synthetic polymer class (polyacrylic, polyvinyl alcohol, polyoxyethylene) three major types according to raw material sources.Polyacrylate is commonly used during shield-tunneling construction sediment improvement.This family macromolecule has high-hydroscopicity, characteristic such as pressurization water retention, thickening property etc., after water suction, volume is inflatable to tens of to thousands of times, its water sucting mechanism is mainly physical absorption (absorption principle of capillary tube, when having pressure, water can flow out) and (by the mode of chemical bond, water and hydroaropic substance is combined into as a whole with chemisorbed.Pressurization can not be released water).
Water-soluble polymer: also claim water-soluble high-molecular material, is mainly divided three classes: water-soluble macromolecule, mainly contains starch based, seaweeds etc.; Semi-synthetic water soluble polymer, mainly contains modified cellulose (CMC etc.), modified starch; Synthesizing water-solubility macromolecule, mainly contains polymer resin (polyacrylamide, polyacrylic acid, polyethylene glycol, polyethylene glycol oxide etc.), condensation resinoid (epoxy resin, polyurethane resin etc.).Polyacrylamide (PAM) is commonly used during shield-tunneling construction sediment improvement.Hydrophilic radical in water-soluble polymer not only makes it have water-soluble, but also has chemical reaction function, and the multiple physical function such as dispersion, flocculation, thickening, drag reduction, bonding, film forming, plastic, chelating.There is water-soluble, peptizaiton, flocculation, tackifying, drag reduction effect, rheological characteristic, suspension effect etc.
When polymer solution adds in the soil body, polymer expands because of water suction, makes the soil body become dry, prevents the generation of gushing; The molecule in the soil body can be connected, strengthen the viscosity of excavation face water and soil, reduce soil body permeability; Improve dregs stream plasticity, the lubrication soil body also helps in conveying worm, form soil plug effect; Lower the adhesion strength of the soil body and knife disc tool.
Shield structure high molecular polymer is a kind of flowable liquids with certain viscosity of formulated homogeneous at the scene, through Cemented filling in cutterhead, Tu Cang, conveying worm, thus increase the viscosity of quarrel soil, improve the working environment of cutterhead, increase the sealing of Tu Cang and be convenient to the transport of quarrel soil.
High molecular polymer can produce following effect: make the shield structure front soil body even after injecting the soil body; Strengthen the slump of soil; Reduce the water permeability of soil, play the effect of water proof; Reduce cutter head torque, reduce facility wearing and tearing; Reduce the viscosity of soil, prevent " mud cake " phenomenon.For solving the creeping of sandy soil, changing the composition of soil, to ensure the mobility of soil and to reduce the water permeability of soil, making excavation face keep stable.
High molecular polymer is used for the effect of shield structure sediment improvement:
(1) good suppression stratum clay dispersibility, when being conducive to shield structure argillic horizon, excavation face is stable.
(2) space truss structure that formed of high molecular polymer, the Absorbable organic halogens soil layer construction when shield tunneling sand, sand ovum layer, suppress sand, sand ovum layer dispersion flows, this system is conducive to the formation of mud cake, is conducive to consolidating tunnel sandy soils dispersion flows.
(3) high molecular polymer has anti-inorganic salts pollution capacity, applies and also have good stability in the water type of high salinity.
(4) high molecular polymer has SELECTIVE FLOCCULATION, the granule of silty sand can be agglomerated into larger particles, can play the effect of water blockoff for High water cut stratum by the crosslinking feature of high polymer self.
(5) effectively can alleviate the spewing phenomenon in shield driving, keep the stream plasticity that dregs is good.
Described high additive high molecular polymer additive comprises: water miscible polyacrylamide particle.
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.
The quantity of described cutter head panel filling passage is 2 roads or 3 tunnels.
Filling number of channels in described native storehouse is 2 tunnels.
Verify through on-the-spot routine test, determine in the extremely hard diabase stratum of rich water tunneling boring, at cutterhead front filling high additive high molecular polymer, low concentration foam of annotating in native storehouse.
The interpolation proportioning matched with driving speed and actual formation feature is as follows:
Consistency of foam: 2%; Stratum injection rate (FIR): 40%; Foam Expansion rate (FER): 1:8.
Consistency of foam: 2%; Stratum injection rate (FIR): 50%; Foam Expansion rate (FER): 1:10.
Polymer volume: 8 ‰, stratum injection rate: 30%.
Polymer volume: 10 ‰, stratum injection rate: 35%.
The compound filling simultaneously of high molecular polymer and foam, based on polymer, foam is auxiliary.I.e. reasonable position, hole injection hole filling high additive high molecular polymer on each spoke arm in cutterhead front, adopt polymer loading system, cutter head panel selects the filling of 2-3 paths.In native storehouse, select position, reasonable hole filling low concentration foam, filling adopts foam mix and generation systems simultaneously, selects 2 paths filling.According to actual formation feature, during strong water rich strata, can assisted Selection to annotate in screw machine 1 road polymer.Can according to actual formation feature, the concrete distribution of the passage of adjustment filling in good time, in the hope of the best improved effect of compound filling.
High additive high molecular polymer is added by cutterhead front, improve the sealing of excavation face rock stratum, shutoff Bedrock Crevice Water more effectively, improve denseness and the workability of the dregs entering Tu Cang, reduce based on the segregation of the dregs of hard rock aggregate chips, precipitation, improve dregs stream plasticity, row property and carry conveying capacity, the smooth deslagging of belt conveyor can be passed through, reduce the phenomenon that spiral is gushed and operating space aggregate chips sprays, improve operating efficiency, improve operating environment.Auxiliary filling foam in storehouse, jointly reduces dregs internal friction, has carried out lubrication and cooling to cutterhead, cutter and helical blade, reduce its degree of wear, decrease the tool changing frequency that opens a position, improve excavation efficiency simultaneously.Totally improve dregs state and construction parameter, enhance construction continuity, improve drivage efficiency.
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 (8)

1. the extremely hard diabase stratum shield driving sediment improvement method of tunneling boring, it is characterized in that, by the position, hole on cutter head panel filling passage and each spoke arm in shield cutter front, adopt polymer loading system to dregs filling high additive high molecular polymer, meanwhile by the filling passage in native storehouse and position, hole, foam mix generation systems is adopted to carry out compound filling to dregs filling low concentration foam.
2. the extremely hard diabase stratum shield driving sediment improvement method of tunneling boring as claimed in claim 1, it is characterized in that, described high additive high molecular polymer additive comprises: water miscible polyacrylamide particle.
3. the extremely hard diabase stratum shield driving sediment improvement method of tunneling boring as claimed in claim 1, it is characterized in that, the additive of described low concentration foam forms by surfactant, stabilizing agent, hardening agent and bleeding agent are composite, and carrier is water.
4. the extremely hard diabase stratum shield driving sediment improvement method of tunneling boring as claimed in claim 1, is characterized in that, the quantity of described cutter head panel filling passage is 2 roads or 3 tunnels.
5. the extremely hard diabase stratum shield driving sediment improvement method of tunneling boring as claimed in claim 1, it is characterized in that, the filling number of channels in described native storehouse is 2 tunnels.
6. the extremely hard diabase stratum shield driving sediment improvement method of tunneling boring as claimed in claim 1, is characterized in that, polymer loading system can also be adopted in screw machine to dregs filling high additive high molecular polymer.
7. the extremely hard diabase stratum shield driving sediment improvement method of tunneling boring as claimed in claim 2, is characterized in that, the polymer volume of described high additive high molecular polymer: 8-10 ‰, stratum injection rate: 30-35%.
8. the extremely hard diabase stratum shield driving sediment improvement method of tunneling boring as claimed in claim 3, is characterized in that, the consistency of foam of described low concentration foam: 2%; Stratum injection rate (FIR): 40-50%; Foam Expansion rate (FER): 1:8-1:10.
CN201510321456.2A 2015-06-12 2015-06-12 Muck improvement method for full-section extra-hard diabase stratum shield tunneling Pending CN105089671A (en)

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CN110157446A (en) * 2019-05-13 2019-08-23 中铁第五勘察设计院集团有限公司 A kind of dispersing agent and preparation method thereof for improveing clay
CN110656943A (en) * 2018-06-28 2020-01-07 中南大学 Method for improving shield sandy muck improvement capacity and determining parameters

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CN110656943A (en) * 2018-06-28 2020-01-07 中南大学 Method for improving shield sandy muck improvement capacity and determining parameters
CN110656943B (en) * 2018-06-28 2020-12-04 中南大学 Method for improving shield sandy muck improvement capacity and determining parameters
CN110157446A (en) * 2019-05-13 2019-08-23 中铁第五勘察设计院集团有限公司 A kind of dispersing agent and preparation method thereof for improveing clay

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Application publication date: 20151125