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1、JournalofEngineeringGeology工程地質學報1004-9665/2014/22(2)一0188.08重塑膨脹土三向膨脹變形試驗研究木楊長青①②③董東①②③譚波①②③劉波①②③(①桂林理工大學廣西礦冶與環(huán)境科學實驗中心桂林541004)(②廣西巖土力學與工程重點實驗室桂林541004)(③桂林理工大學土木與建筑工程學院桂林541004)摘要以廣西寧明灰白重塑膨脹土為研究對象,運用自制“膨脹土三向脹縮測試儀”開展了不同初始含水率和三向壓力的膨脹試驗,研究了初始含水率和三向壓力對脹限、三向膨脹率的影響規(guī)律。試驗表明,三向等壓時,豎向的膨脹率始終大于水
2、平向膨脹率,比值為1.21~1.27,該比值與初始含水率、三向壓力無關;三向膨脹時程均可以分為快速膨脹、緩慢膨脹和趨于穩(wěn)定3個階段;脹限與三向壓力的對數線性相關,與初始含水率無關;相等初始含水率和干密度條件下,三向膨脹率均與三向壓力的對數線性相關。關鍵詞膨脹土三向脹縮測試儀三向壓力膨脹率時程脹限三向膨脹率中圖分類號:TU411.8文獻標識碼:ALABoRAToRYTESTSoNTHREE.DIRECTIoNALSWELLINGDEFoRMA-TIoNoFREMoLDEDEXPANSIVESoILYANGChangqing~DONGDong~TANBo①②③LIUB0
3、①②③(①GuangxiScientificExperimentCenterofMining,MetallurgyandEnvironment,Guilin面eofTechnology,Guilin541004)(②GuangxiKeyLaboratoryofGeomechanicsandGeotechnicalEngineering,Guilin541004)(③CollegeofCivilandArchitectureEngineering,GuilinUniversityofTechnology,Guilin541004)AbstractThispaperst
4、udiesthecharacteristicofremoldedgreyexpansivesoilinNingmingofGuangxiprovince.Aseriesofswellingtestswereconductedforcubicexpansivesoilofdifferentinitia1moisturecontentsandthree-directionalpressures.Thetestdeviceisahome.made“three—directionalswellingandshrinkageofexpansivesoiltester”Thet
5、estsinvestigatethenaturallawoftheeffectsoftheinitialmoisturecontentandthethree—directional.pressuretothemaximumwatercontent&thethree.directionalexpansionrate.Accordingtothetestresults,theverticalexpansionrateisalwayslargerthanhorizontalexpansionratewhenthree—directionalpressureisequa1.
6、Theirratiois1.21~1.27.Theratioisunrelatedtotheinitialmoisturecontentandthethree—directionalpressure.Thetime—deformationhistoryofthethree-directionalexpansionrateincludesthreephasestherapidexpansion,theslowexpansionandthestabilization.Themaximumwatercontenthasalinearcorrelationtotheloga
7、rithmofthethree—directionalpressure.Butitdoesnotassociatedwiththeinitialmoisture.Thethree.directionalexpansionratehasalinearcorrelationtothelogarithmofthethree.directionalpressure.whentheexpansivesoilhasthesameinitial收稿日期:2013-06-09;收到修改稿日期:2013—09-22.基金項目:國家自然科學基金項目(41062006)資助.第一作者