会计学水泥(shuǐní)粉喷机水泥土搅拌法分为深层搅拌法（湿法）和粉体喷搅法（干法）。水泥土搅拌法适用于处理正常固结的淤泥与淤泥质土、粉土、饱和黄土、素填土、黏性土以及(yǐjí)无流动地下水的饱和松散砂土等地基。当地基土的天然含水量小于30％、或地下水的pH值小于4时不宜采用干法。水泥浆液搅拌法是美国在第二次世界大战后研制成功的，称（Mixed－in－PlacePile(简称MIP法）。国内1978年研制出第一台搅拌机械。粉体喷射搅拌法（DryJetMixingMethod，简称DJM法）由瑞典人KjeldPaus于1967年提出设想，1971年制成第一根桩，1974年获得专利。铁道第四勘察设计院1983年开始试验研究，并应用(yìngyòng)于过程中。水泥土搅拌法的优点：（1）最大限度地利用了原土；（2）搅拌时无振动、无噪音和无污染，对周围原有建筑物及地下沟管影响很小；（3）设计灵活，可按不同地基土的性质及工程设计要求，合理选择固化剂及其配方；（4）根据上部结构的需要可灵活地采用柱状、壁状、格栅状和块状等加固形式；（5）与钢筋混凝土桩基相比，可节约钢材(gāngcái)并降低造价。11.1IntroductionTheuseofinsitusoilmixing(SM)toimprovetheengineeringandenvironmentalpropertiesofsoftorcontaminatedgroundhasincreasedwidelysinceitsgenesis.Thisindicatesgrowinginternationalinterestandacceptanceofthisrelativelynewandquicklydevelopingtechnology.Inthismethodofgroundimprovement,soilsaremixedinsituwithdifferentstabilizingbinders,whichchemicallyreactwiththesoiland/orthegroundwater.Thestabilizedsoilmaterialthatisproducedgenerallyhasahigherstrength,lowerpermeabilityandlowercompressibilitythanthenativesoil.Themostimportantbindersarecementsandlimes.SMtechnologycanbesubdividedintotwogeneralmethods:theDeepMixingMethodandShallowMixingMethod.ThemorefrequentlyusedandbetterdevelopedDMMisappliedforstabilizationofthesoiltoaminimumdepthof3mandiscurrentlylimitedtotreatmentdepthofabout50m.Thebindersareinjectedintothesoilindryorslurryformthroughhollowrotatingmixingshaftstippedwithvariouscuttingtools.Themixingshaftsarealsoequippedwithdiscontinuousaugerflights,mixingbladesorpaddlestoincreasetheefficiencyofthemixingprocess.Insitusoilmixingisaversatilegroundimprovementmethod.Itcanbeusedtostabilizeawiderangeofsoils,includingsoftclays,siltsandfine-grainedsands.Stabilizationoforganicsoilsisalsoavailable,butismoredifficultandrequirescarefullytailoredbindersandexecutionprocedures.However,theengineeringpropertiesofthestabilizedsoilwillnotonlydependonthecharacteristicsofthebinder.Theywillalsodepend,toalargeextent,ontheinherentcharacteristicsofeachsoilandthewayithasbeendeposited,aswellasonm