简介:有在直径的30m和在高度的6m的大规模桶基础被用作风汽轮机的基础。宽浅的基础与有到直径的高度的高比率的传统的桶基础不同。新类型基础的cover-load-bearing模式能抵抗更多的外部装载。完成适用的模式,在桶内的泥泞土壤应该被增强,它将改进土壤力量并且转变为土壤和基础整个部分抵抗外部装载。增强方法的真空和电镀物品渗透的土壤在实验被使用。结果证明泥泞土壤的适用的行为被否定压力和电镀物品渗透的效果有效地改进,并且有更好的力量的改进泥泞土壤能和桶基础工作,意味着新桶基础的最高封面的适用模式被完成。在增强过程的土壤期间,基础向下移动了,即,基础的解决几乎在真空和电镀物品渗透的方法引起的预装的过程期间被完成。
简介:Thispaperpresentsaninvestigationonstrengthofcementdeepmixing(CDM)mixture.Fourtypicalworksofoffshoreorland-basedprojectsareintroduced.Withsamplesfromtheseprojectsandlaboratorytests,statisticalanalysisismadeontheincrementlawofthestrengthofcement-soilmixturewithdifferentamountofcement,andstrengthsunderdifferentworkingconditionsarecompared.Itisfoundthattheamountofcementinthecement-soilmixtureiscloselyrelatedtotheunconfinedcompressivestrengthofthemixture.Attheageof90d,theunconfinedcompressivestrengthofthecement-soilmixtureincreasedby0.054Mpa-0.124Mpawitheachcementincreasing10kg/m3inthecement-soilmixture,averagelyincreasedby0.085Mpa,whilethatattheageof120dincreasedby11%incomparison.Thequalityofthecement-soilmixtureshouldbecomprehensivelyevaluatedinaccordancewiththetrimmedaverageofstrength,coefficientofvariationandrockqualitydesignation(RQD)indicatorsofsamplingratio.
简介:把没有庄稼植被,广泛地在国外被使用的平衡模型,温度和湿度在完整的照明回答联合温室土壤的模型的精力基于表面被建立。就在温室,弱太阳的放射和土壤的很少表面蒸发的相对关上的环境而言,在不同土壤层的水内容的每日的变化可以被忽视,然后,温度和湿度地联合模型被简化到一个一个维的热散开模型。简化模型和湿度地联合模型采用了土壤的一样的计算方法物理参数和热散开的分离格式微分方程,并且没有庄稼植被,在完整的照明在温室土壤被用于温度地的连续模拟。通过在模拟结果和试验性的数据之间的比较,简化模型的精确被验证。在24h周期的土壤热流动变化的典型规则也被获得。
简介:SomelaboratorydiffusiontestswereconductedwithdiffusiondevicetodeterminethediffusioncoefficientofCr(Ⅵ)ionpassingthroughDalianredclaysamples.TheconcentrationsofCr(Ⅵ)atdifferentplacesofthesampleswerethenmeasuredspectrophotometricallyafterastandingtimeof1000d.Aone-dimensionalsolutetransportequationwasusedtosimulatethetransportofCr(Ⅵ)throughclaysamples.Back-calculationofdiffusioncoefficientofCr(Ⅵ)wasmadewithfinitedifferencemethod.Parametricanalysiswasconductedtosimulatevariationsinsoildrydensity,temperature,pHandstandingtime.Theresultsshowthatthemethodusedinthispaperissimpleandeffective.ThediffusioncoefficientofCr(Ⅵ)inDalianredclayvariesfrom1.50×10-7cm2/sto2.08×10-7cm2/s.After1000ddiffusion,theconcentrationofthesourcesolutiondropsdownto1.27mg/Lfrom62.5mg/L,andthediffusiondistanceisonly3.5cm.Undertheassumptionthatdiffusioncoefficientisconstant,thediffusioneffectbecomesmoreobviouswithlowerdensity,lowertemperature,higherpHvalue,andmuchmoretime.