玄武岩残积土土-水特征曲线试验研究  

RESEARCH ON THE SOIL-WATER CHARACTERISTIC CURVE OF BASALT RESIDUAL SOIL

作　　者：张浪[1] 雷学文[1] 孟庆山[2] 李勇[1] 

机构地区：[1]武汉科技大学城市建设学院,武汉430065 [2]中国科学院武汉岩土力学研究所,岩土力学与工程国家重点实验室,武汉430071

出　　处：《工业建筑》2017年第12期17-20,81,共5页Industrial Construction

基　　金：西部交通建设科技项目(2009318802074)

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Van Genuchten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400 k Pa时,竖向应力的增加对土-水特征曲线的影响减小;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要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。By using the unsaturated soil consolidation apparatus,soil-water characteristic curves of basalt residual soil were measured under different vertical stress and dry densities.The soil-water characteristic curves were fitted by Van Genuchten model;the influence of the change of soil dry density and stress state on the soil-water characteristic curve was compared and analyzed after pressure consolidation.The experimental results showed that the model of VG model had higher fitting degree of the obtained data,which was suitable for the modeling of soil-water characteristic curve of basalt residual soil;the higher the vertical stress,the less the soil moisture was discharged,the more gentle the curve,the inlet value and residual moisture content were positively correlated with vertical stress,when the vertical stress exceeded 400 kPa,the effects of vertical stress on the soil-water characteristic curve were reduced;with the increase of dry density,the residual moisture content increased and the water holding capacity of soil was enhanced.The influence of vertical stress on the soil-water characteristic curve was mainly achieved by changing the compactness of the soil,and the changes of soil stress state had less influence on the soil-water characteristic curve.

关 键 词：玄武岩残积土 竖向应力 干密度 土-水特征曲线 VG模型 

分 类 号：TU41[建筑科学—岩土工程]