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1、JournalofEngineeringGeology工程地質(zhì)學(xué)報1004—9665／2009／17(6)43745-07金沙江中游上江壩址河床深厚覆蓋層建高壩可行性探討王啟國(長江水利委員會長江巖土工程總公司武漢430010)摘要上江壩址為金沙江中游龍頭水庫的比選壩址之一，壩址河床覆蓋層最厚達(dá)206．2m，在深厚覆蓋層上修建最低249in級的高土石壩，筑壩技術(shù)難度大。通過測繪、鉆探、物探、物理力學(xué)性質(zhì)測試等工作揭示：(1)河床覆蓋層由漂卵石、低液限粘土、礫卵石、碎塊石、砂礫石等組成；(2)河床覆蓋層中各粗粒土強度相對較高，低液限粘土強度較低，為壩基一條連續(xù)完整的相對軟弱帶；(3
2、)壩址位于龍蟠斷陷盆地內(nèi)，主要受新構(gòu)造垂直差異運動的影響，河床接受金沙江上游及坡體上物質(zhì)堆積，逐漸形成了現(xiàn)今的深厚覆蓋層。初步研究本壩址在河床覆蓋層上建高土石壩是可行的，但需要對壩基采取工程處理措施。探討了不同建壩方案所引發(fā)的工程地質(zhì)問題，為筑壩技術(shù)研究提供了地質(zhì)依據(jù)。關(guān)鍵詞深厚覆蓋層成因工程特性建壩可行性高土石壩上江壩址中圖分類號：P642；TV221．2文獻(xiàn)標(biāo)識碼：AFEASIBILITYSTUDYoNCoNSTRUCTIoNoFHIGHDAMATMIDDLEREACHESoFJINSHARⅣERWITHTHICKRⅣERBEDDEPoSITWANGQiguo(Yangtze
3、RiverC,eotechnicalEngineeringCorporation，Changjiang耽ResourcesCommission。Wuhan430010)AbstractShan~iangisoneofthesitesforconstructingtheleadingdamtothemiddlereachesofJinshaRiverRes-ervoirdamsite．ThemaximumthicknessofQuaternarysoilis206．2mintheriveratthepossibledamsite．Theminimumheightoftheemban
4、kmentdamis249m．Thesizeofthedam．Constructionofsuchdamisofagreatdif-ficuhy．Throughmapping，drilling，physicalexplorationItheworkofphysicalandmechanicaltestinghavere-vealed：(1)thebeddepositscomposedofthedriftgravel，lowliquidlimitclay。gravel，fragmentsofstone，sandandgravel，etc；(2)thecoarse—grainedso
5、ilisrelativelyhighintensity，clayoflowliquidlimitlowerintensity，therelativeweaknessofthedamwiththefoundationforacomplete；(3)thedamaddressesinLongpanriftbasin，wherethereisamajordiferencebetweentheverticalstructuresoftheneo—tectonics，armdepositionareafortheupperreachesoftheJinshaRiver．Preliminar
6、ystudyshowsthattheconstructionofahighearth—-rockdamatthesiteisfeasible．HoweverItheneedforthedamfoundationtreatmentmeasureshastobetakenbytheproject．Thepaperfurtherdiscussestheefectsofdifferentprogramscausedbydamconstructionandengineeringgeologicalprob·lems，thetechnologyfortheconstructionofthed
7、am．Thepaperprovidesthegeologicalbasisforfurtherresearch．KeywordsDeepoverburden，Causes，Engineeringproperties-Thefeasibilityofbuildingadam，HighearthdamShangjiangdam收稿日期：2009—03—12；收到修改稿日期：2009—06—05．作者簡介：王啟國，工程地質(zhì)專業(yè)．Email：cjwwqg001@163．con746Jou
