懸掛式防滲墻防滲效果的模擬試驗研究.pdf

1、河海大學碩士學位論文懸掛式防滲墻防滲效果的模擬試驗研究姓名：陳西安申請學位級別：碩士專業(yè)：巖土工程指導教師：王保田20070601ABSTRACTSeepagefailureisoneofthehighfrequentdisastersfordikeengineeringduringfloodseasonAtpresentanumberoffloeverticalcutofftechniqueshavebeenwidelyusedinl

2、eveeproject，andmanyrichexr麗enceshavebeenaccumulatedinthetreatmentofdiseasedleveeproject耽everticalseepagecontrollingtechniquehasbeenwidelyusedinleveeprojectanditisthemainreinforcingmethodsforseepagepreventing111eseepageco

3、ntrollingwallisoneofthetechniquesofverticalseepagecontrollingmethodanditcanbedividedintothreetypes：closedseepagecontrollingwail，semiclosedseepagecontrollingwallandsuspendedseepagecontrollingwailTheresearchofseepagepreven

4、tingindicatesthatthefoundationofthemiddleandlowel“reachesofYangtzeRiveismostlycomposedofdualsubsoillayerswhichisoffeIlsoftclayandlacksreliablemethodstopreventseepageThemiddleandlowerreachesofYangtzeRivehasbeenwidenandrei

5、nforced，buttherearestillsomehiddentroubles，forexampledisorderembankmentsoil，smalldegreeofcompaction，lowerconstructionqualitylowercriterionofcontrollingflood，seriousleakageofdikefoundation，severerodingofembankmentslopebad

6、lydestroyedbythehumanbeingdemolishingandagingofthebuildingsthatacrosstheembankmentlong—timeandcontinuoussettlementandsoonOnthebasisofthecharacteristicsofthemiddleandlowerreachesofYangtzeRiveaseeDagesandboxhasbeenmadetosi

7、mulatethespecialtyofthedualsubsoillayersThetestshavebeendoneindoorsandthefunctionsofsuspendedsecDagecontrollingwallinpreventingseeDagefailurehavebeendiscussedThefollowingarethemaincontentsThesoilthatisusedinthetestisfrom

8、thesouthbankofNanKingdikeofYangtzeRiveTheupperlayeriscomposedofsiItclayandtheunderlayeriscomposedofsiIt111esoilissametothatofthelocaispotsothehydraulicfactorsofseepagefailureisalsothesarlleThetestsofthetwokindsofsoilhave

9、beencarriedoutwhicharespecificgravitycoe伍cientofpermeabilityparticlesizeanalysis1iquidlimitandplasticlimitTheresultsindicatethatthesiltlacksmiddleparticlesandtheparticlesizeissymmetricalwhichcaneasilyleadstoseepagedeform

10、ationThehydraulicconductibilityofsiltis20timesthatofthesiItclayUnderthefunctionofhighwaterlevelduringfloodseasongreathydraulicpressurecallbeeasilyproducedunderthebottomofthesiltclaylayerwhichcancausesomedisasterstohappen

11、SosomeeffectivemeasnresmustbetakentopreventdangersBasedonthefoundationcharacteristicsofYangtzeRiveembankmentaseepagesandboxhasbeenmanufacturedwhichismadeofplexigiassItis2meterslonglmeterhighand10centimeterswidcSiltdayand

12、siItareputintothesandboxItcanbeusedtoanalyzethecharacteristicsofseepagefailureandthefunctionofsuspendedseepagecontrollingwallwhichisusedtopreventseepagefailureTheactualhydraulicgradientissimulatedbychangingthedeepnessoft

13、hesuspendedseepagecontrollingwallwhichiscomposedofsiltclayThemechanicalcompositionanddrydensityofthesoilaresametothatofthelocalspotsothecriticalhydraulicgradientandtheeffectofpreventingseepageareconsistentwiththatoflocal