淺談泡沫劑及分散劑在盾構(gòu)施工中的應(yīng)用

1EPBprojects

insoftground

軟土地層中地質(zhì)條件決定方案Lyon(F)‘96NFMEPB,

?=10.98m

1.5-3barwater

Foam+Polymer+FillerBotlek(NL)‘99

HKEPB,?=9,76m

3.6barwater

Foam+PolymerAviles(ESP)‘99

LovatEPB,?=3.4m

2.5barseawater

Foam+PolymerToulouse(F)‘2003HKEPB,?=7.72m

mainly

underwatertable

Foam+Anti-ClayTorino(I)‘2004LovatEPB,?=7.7m

mainlyabove

watertable

Foam+PolymerBARCELONA2003HerrenknechtEPB?=12.06m

2.0barwaterpressure

foam+polymer+fillersuspensionChengdu(PRC)‘07

HKEPB,2actualrangeofEPBuse使用EPB的土質(zhì)范圍

weakgroundundergroundwaterpressure地下水壓下的軟弱地層0.0010.0100.100110100TonSchluffSandKies1009080706050403020100Particlesize粒徑[mm]verycoarse,frictionedsoil礫石，高摩擦力土體useFoam&specialPolymers+finefiller泡沫+特殊聚合物+細填料siltysands粉沙層useFoams用泡沫coarse,frictionedsoil粗砂，高摩擦力土體useFoam&Polymers用泡沫加聚合物clayadhesion&clogging粘性土，糊刀盤usefoamandanti-clay-additives采用泡沫加分散劑3Soilconditioningagents

用來做土壤改良的外加劑Decrease

clogging,adhesion,transportproblems降低堵塞、粘性、輸送問題等風險Increase

the

TBMspeed

增加TBM掘進速度Allow

fillingoftheworkingchamber提高土倉充填I(lǐng)ncreasetheTBMspeed

增加TBM掘進速度Decrease

abrasion,torque

降低磨損、扭距Increase

soiladhesion,impermeability增加土壤粘性，抗?jié)B透性Decrease

liquidsoilconsistency

降低濕渣土的稠度Decrease

settlements

減少沉降3.Polymers聚合物2.anti-clay-additives粘土分散劑Foams泡沫劑4SoilConditioningI渣土改良

Foam

泡沫劑MEYCO?SLF30 universal,badwater,clay適用各種土質(zhì)，粘土MEYCO?SLF33 universal適用各種土質(zhì)MEYCO?SLF41 soilwithwater,clay含水土壤，粘土5whatisfoam?

什么是泡沫？technicaldetail技術(shù)點inuse應(yīng)用6SurfactantTypes表面活化劑類型IonicClasses離子Structures結(jié)構(gòu)-Anionic陰離子~0Non-Ionic無離子+Cationic陽離子LinearAlkyl線狀烷基BranchedAlkyl支烷基DualhydrophilicGroups雙性親水團Amphoteric兩性7TunnelFoamAppearance泡沫狀態(tài)MEYCOFixSLFGroup系列88HighestFoamQuality

不同F(xiàn)ER下的發(fā)泡質(zhì)量FER=8FER=10FER=20FER=V壓縮空氣/V泡沫劑水溶液9Whyusedifferentfoams?選用不同泡沫劑的原因

airincorporationproperties與空氣的混合性能halflifetime穩(wěn)定時間anti-claybehaviour抗粘性能力ion-sensibility(Ca,Na,...)與離子敏感度

rheologicalbehaviour流變能力soildrainingbehaviour渣土排干能力foamshavedifferentproperties:不同的泡沫具有不同的特性labtestshavetobecarriedoutpriortositeuse.現(xiàn)場使用前須做室內(nèi)試驗以選用合適的型號10SoilConditioningII渣土改良

anti-clayadditives

粘土分散劑Rheosoil?211 standardanti-clay-polymer標準型聚合物Rheosoil?212 improvedversionof211

211的改進型Rheosoil?143 foaminganti-clay-polymer發(fā)泡型聚合物11clogging&adhesiononthecutterhead

刀盤的堵塞與粘附12Anti-clayadditives

粘土分散劑useinclayandclayeysoils

用于粘土或粘性土體-adhesiononmetalsurfaces

粘附于金屬表面-agglomeration(cohesion)ofsoilchipstobigblocks

土塊結(jié)團Problem

問題-cloggingofthecutterhead

刀頭堵塞-cloggingintheworkingchamber

土倉堵塞Consequence

結(jié)果Result

導致-lowTBMspeed

掘進速率低-highmaintenance&revisioncosts

保養(yǎng)、維護成本高13Changeofsoilbehaviour使用粘土分散劑的withRheosoilanti-clayadditives

效果14MadridMetroLamproject–beltview

馬德里地鐵－輸送帶效果Foam泡沫foam+Rheosoil211泡沫＋Rheosoil21115SoilConditioningIII

渣土改良

Polymers

聚合物MEYCO?FixSLFP1 mediumliquidsoils中度含水土壤MEYCO?FixSLFP2 waterbinding,increasing soiladhesion,stabiliser富含水，增加土壤粘性，增加土壤穩(wěn)定性16Hardrockchips,BodioTBM,CHreducedfinecontentexcessofwaterHowdopolymerswork?

聚合物的作用PolymerSLFP1PolymerSLFP217CharacteristicsofMEYCOSLFP1&P2

MEYCOSLFP1和P2機理觸變性提高土體顆粒聚合物鏈聚合物的長鏈結(jié)構(gòu)：

提高泡沫穩(wěn)定性

提高土體流變性

增強土體觸變性

防止土體離析

提高土體抗?jié)B性出土順暢18Usingpolymershere?

聚合物會起作用嗎

19SingaporeMetro-PolymerP1

新加坡地鐵－使用P1聚合物20GuangzhouMetroLine3

UseofMEYCOSLFP1

中交隧道廣州地鐵三號線使用MEYCOSLFP1地質(zhì)情況：在以④7~④

12為主的連續(xù)地層中掘進，以細砂、中砂、粗砂和礫砂為主，且含水量高問題：扭矩升高

土倉壓力建立困難

出土不能成形，呈流砂狀解決方法：MEYCOSLF30+10%SLFP1結(jié)果：扭矩降低建立穩(wěn)定的