金沙江中游上江坝址河床深厚覆盖层建高坝可行性探讨.pdf

《金沙江中游上江坝址河床深厚覆盖层建高坝可行性探讨.pdf》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、JournalofEngineeringGeology工程地质学报1004—9665／2009／17(6)43745-07金沙江中游上江坝址河床深厚覆盖层建高坝可行性探讨王启国(长江水利委员会长江岩土工程总公司武汉430010)摘要上江坝址为金沙江中游龙头水库的比选坝址之一，坝址河床覆盖层最厚达206．2m，在深厚覆盖层上修建最低249in级的高土石坝，筑坝技术难度大。通过测绘、钻探、物探、物理力学性质测试等工作揭示：(1)河床覆盖层由漂卵石、低液限粘土、砾卵石、碎块石、砂砾石等组成；(2)河床覆盖层中各粗粒土强度相对较高，低液限粘土强度较低，为坝基一条连续完整的相对软弱带；(3

2、)坝址位于龙蟠断陷盆地内，主要受新构造垂直差异运动的影响，河床接受金沙江上游及坡体上物质堆积，逐渐形成了现今的深厚覆盖层。初步研究本坝址在河床覆盖层上建高土石坝是可行的，但需要对坝基采取工程处理措施。探讨了不同建坝方案所引发的工程地质问题，为筑坝技术研究提供了地质依据。关键词深厚覆盖层成因工程特性建坝可行性高土石坝上江坝址中图分类号：P642；TV221．2文献标识码：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．作者简介：王启国，工程地质专业．Email：cjwwqg001@163．con746Jou