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1、第29卷增刊巖土力學(xué)Vol.29Supp.2008年11月RockandSoilMechanicsNov.2008文章編號(hào):1000-7598-(2008)增刊-288-05泥漿性質(zhì)對泥水盾構(gòu)開挖面泥膜形成質(zhì)量影響11,2341韓曉瑞,朱偉,劉泉維,鐘小春,閔凡路(1.河海大學(xué)巖土工程科學(xué)研究所,南京210098;2.河海大學(xué)環(huán)境科學(xué)與工程學(xué)院,南京210098;3.中鐵十四局集團(tuán)南京長江隧道工程指揮部,南京211800;4.河海大學(xué)土木工程學(xué)院,南京210098)摘要:泥水盾構(gòu)以壓力泥漿支護(hù)開挖面,泥膜的形成對開挖面穩(wěn)定非常重要,尤其在高滲透性地層,泥漿極易穿透地
2、層直接滲出而不能形成所需的支護(hù)壓力。以南京長江隧道為背景,詳細(xì)闡述了泥膜的作用原理及泥膜質(zhì)量的評價(jià)指標(biāo),并通過自行設(shè)計(jì)的成膜裝置開展泥漿性質(zhì)對泥水盾構(gòu)開挖面泥膜形成質(zhì)量的影響試驗(yàn)研究。試驗(yàn)結(jié)果表明,泥漿顆粒級配及密度相同時(shí),泥漿粘度高,物理穩(wěn)定性好,則泥膜形成容易,形成泥膜薄、致密,濾水量小。試驗(yàn)結(jié)果對泥水盾構(gòu)施工具有指導(dǎo)意義。關(guān)鍵詞:泥水盾構(gòu);泥膜;開挖面穩(wěn)定;泥漿中圖分類號(hào):TU411文獻(xiàn)標(biāo)識(shí)碼:AInfluenceofslurrypropertyonfilter-cakequalityonworkingfaceofslurryshield11,2341HANX
3、iao-rui,ZHUWei,LIUQuan-wei,ZHONGXiao-chun,MINFan-lu(1.ResearchInstituteofGeotechnicalEngineering,HohaiUniversity,Nanjing210098,China;2.CollegeofEnvironmentalScienceandEngineering,HohaiUniversity,Nanjing210098,China;3.NanjingYangtzeRiverTunnelEngineeringHeadquarters,ChinaRailwayFourteen
4、thGroupCorporation,Nanjing211800,China;4.CollegeofCivilEngineering,HohaiUniversity,Nanjing210098,China)Abstract:Inslurryshield,theworkingfaceissupportedbythepressedslurry.Soitisveryimportanttobuildupafilter-caketoprotecttheworkingface,especiallyinhighlypermeablegroundwheretheslurryisea
5、sytopenetratethegroundwithoutallowingtobuilduptherequiredsupportpressure.Thefunctionandqualityestimateindicesoffilter-cakewereexpounded.Aseriesoffilter-cakebuildinguptestswerecarriedoutfortheNanjingYangtzeRiverTunnelwiththeapparatuswhichwasdevelopedjustfortheresearch—theinfluenceofslur
6、rypropertyonfilter-cakequalityontheworkingfaceofslurryshield.Inthesetests,therangesofgrainsizedistributionanddensityoftheslurriesweresame.Asshownintheresults,iftheviscosityishighandthestabilityisgood,thefilter-cakewillbeeasytobuildup;itwillbethinandcompact;andthedischargedwaterwillbeli
7、ttle.Theresultofthisresearchissignificantintheslurryshieldconstruction.Keywords:slurryshield;filter-cake;workingfacestability;slurry發(fā)揮作用;3)泥漿從開挖面滲透到一定范圍的地層1引言[1]中,使開挖面地層增加粘聚力,其中開挖面上不隨著武漢長江隧道、南京長江隧道、上海長江透水泥膜的形成是核心因素。隧道、獅子洋隧道等一批大型泥水盾構(gòu)的修建,我在低滲透性的粘土及粉質(zhì)粘土等地層,地層孔國掀起了一股修建大型過江過河隧道的熱潮,泥水隙較小,泥