玄武岩残积土土-水特征曲线试验研究

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1、玄武岩残积土土-水特征曲线试验研究张浪雷学文孟庆山李勇武汉科技大学城市建设学院中国科学院武汉岩土力学研宄所岩土力学与工程国家重点实验室摘要：利用非饱和土固结仪测得不同竖向应力及干密度下的玄武岩残积土土-水特征曲线，采用VanGerwchtcm模型对试验所得的土-水特征曲线进行拟合，比较和分析加压固结后，土体干密度、应力状态的改变对其土-水特征曲线的影响。结果表明:VG模型对所得数据的拟合度较高，适合玄武岩残积土土-水特征曲线的建模;竖向应力越大，土体水分越不容易排出，曲线越平缓，进气值、残余含水率与竖向应力呈正相关，当竖向应力超过400kPa时，竖向应力的增加对土-水特征曲线

2、的影响减小；随着干密度的增大，残余含水率增大，土体的持水能力增强;竖向应力对土-水特征曲线的影响主耍是通过改变土体的干密度来实现，而土体应力状态的改变对土-水特征曲线的影响较小。关键词：玄武岩残积土;竖向应力;丁•密度;土-水特征曲线;VG模型;作者简介：张浪，男，1990年出生，硕士研宄生作者简介：雷学文，leixuewen@wust.edu.cn基金：西部交通建设科技项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;云贵地区广泛分布着玄武岩，表面经过强风化作用形成低强度、高压