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1、ProposedDesignPhilosophy,Construction,InstallationandMonitoringMethod(asper22.1.7ofsection1.0)1.SourceofborrowspitindicatingthelocationandquantityWehavelicensegivenbyVietnamauthoritytoexploitaquantityof8,400,000m3inNhaBeriverandthelocationisinNhonTrachdistrict,DongNaipro
2、vince.2.PhysicalproprietiesofproposedfillmaterialThesamplingtestofsandproposedtouseiscarriedoutaccordingtoAASHTOM45-89,C144-88(seeTestResultofAnalysesofSandcomponent).Thespecificweightofthesandis2.634,unitweight1.5g/cm3,organiccontent2.87%andmodules2.52.3.Proposedmethodo
3、fstatementandmonitoringdevices3.1MethodstatementAccordingtothegeotechnicalreportofthesite,thevoidratioofthesoftsiltyclay(e)is2.377,andthepermeabilitycoefficient(Kv)5.5*10-7cm/s.Ifweadopt“wickdrainsandpre-loading”methodtoreachasoilbearingcapacityof50Kpa,75Kpa,100Kpaundert
4、hesite’sconditions,theconsolidationperiodwouldbefarbeyondtheproposedworkperiod.Forthepurposeofreducingtheconsolidationperiodoffoundationsoilanoverloadshouldbeadded,thoughtheloadingwouldbe7.30mhightofulfillthebearingcapacityof100Kpa.Obviously,thistechniquewouldbearatremen
5、dousnumberofloadingandunloading,whichwouldalsomeanahighconstructioncost.Thestabilityofsideslopewouldalsobedifficulttomonitor.BasedonourpreviousexperienceofsoftsoilimprovementofChinacoastalandHiepPhuocPowerPlantinNhaBe,15kmSoutheastofHochiminhCity,thepre-loadingmethodisap
6、propriateonlyforgeneralarea.Inprocessareawesuggesttoadoptedthefollowingmethod(detailsseedrawings“ProposedProcessAreaPlan”and“ProposedProcessAreaZone”inpage6,7):f=50Kpa,vacuumprecompressionmethod;f=75Kpa,vacuumprecompressionandfillingwater(2.0m)onmembranemethod;f=100Kpa,v
7、acuumprecompressioncompoundwithloadingmethod.Thehydraulicfillingofseasandshouldbeadoptedundertheelevation+2.80,whichisspecifiedinthetenderdocuments.Butbasedonoursiteinvestigationreport,weproposetousesweetwatersandinsteadofseasandforthesefollowingreasons:(1)Finegradeandhi
8、ghmudcontentoftheseasand;(2)Nolocalfacilitiesavailablesuchashydraulicfillingmudabsorption.Thebackfillma
