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1、玄武巖殘積土土-水特征曲線試驗研究張浪雷學文孟慶山李勇武漢科技大學城市建設學院中國科學院武漢巖土力學研宄所巖土力學與工程國家重點實驗室摘要:利用非飽和土固結儀測得不同豎向應力及干密度下的玄武巖殘積土土-水特征曲線,采用VanGerwchtcm模型對試驗所得的土-水特征曲線進行擬合,比較和分析加壓固結后,土體干密度、應力狀態(tài)的改變對其土-水特征曲線的影響。結果表明:VG模型對所得數據的擬合度較高,適合玄武巖殘積土土-水特征曲線的建模;豎向應力越大,土體水分越不容易排出,曲線越平緩,進氣值、殘余含水率與豎向應力呈正相關,當豎向應力超過400kPa時,豎向應力的增加對土-水特征曲線
2、的影響減小;隨著干密度的增大,殘余含水率增大,土體的持水能力增強;豎向應力對土-水特征曲線的影響主耍是通過改變土體的干密度來實現,而土體應力狀態(tài)的改變對土-水特征曲線的影響較小。關鍵詞:玄武巖殘積土;豎向應力;丁?密度;土-水特征曲線;VG模型;作者簡介:張浪,男,1990年出生,碩士研宄生作者簡介:雷學文,leixuewen@wust.edu.cn基金:西部交通建設科技項B(2009318802074)STUDYONTHESOIL-WATERCHARACTERISTICCURVEOFBASALTRESIDUALSOILZhangLangLeiXuewenMengQingsh
3、anLiYongCollegeoO^xbanConstruction,WuhanUniversityofScienceandTechnology;StateKeyLaboratoryofGeomechanicsandGeotechnicalEngineering,InstituteofRockandSoilMechanics,ChineseAcademyofScience;Abstract:Byusingtheunsaturatedsoilconsolidationapparatus,soil-watercharacteristiccurvesofbasaltresidual
4、soilweremeasuredunderdifferentverticalstressanddrydensities,thesoil-watercharacteristiccurveswerefittedbyVanGcnuchtcnmodel,theinfluenceofthechangeofsoildrydensityandstressstateonthesoil-watercharacteristiccurvewascomparedandanalyzedafterpressureconsolidation.Theexperimentalresultsshowedthat
5、themodelofVGmodelhadhigherfittingdegreeoftheobtaineddata,whichwassuitableforthemodelingofsoil-watercharacteristiccurveofbasaltresidualsoil;thehighertheverticalstress,thelessthesoilmoisturewasdischarged,themoregentlethecurve,theinletvalueandresidualmoisturecontentwerepositivelycorrelatedwith
6、verticalstress,whentheverticalstressexceeded400kPa,theeffectsofverticalstressonthesoil-watercharacteristiccurvewerereduced;withtheincreaseofdrydensity,theresidualmoisturecontentincreasedandthewaterholdingcapacityofsoilwasenhanced.Theinfluenceofverticalstressonthesoil-watercharacteristiccurv
7、ewasmainlyachievedbychangingthecompactnessofthesoil,andthechangesofsoilstressstatehadlessinfluenceonthesoil-watercharacteristiccurve.Keyword:basaltresidualsoil;verticalstress;drydensity;soil-watercharacteristiccurve;VGmodel;云貴地區(qū)廣泛分布著玄武巖,表面經過強風化作用形成低強度、高壓