毕威高速公路玄武岩红土土水特征曲线测定与模型应用研究  

Determination of Soil-Water Characteristic Curve and Model Research of Basalt Laterite in Bijie-Weining Highway

作　　者：唐军[1] 余沛[2,3] 颜荣涛[2] 魏厚振[3] 

机构地区：[1]贵州省交通规划勘察设计研究院股份有限公司,贵阳550001 [2]天津城市建设学院土木工程系,天津300384 [3]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：《路基工程》2011年第5期66-68,72,共4页Subgrade Engineering

基　　金：国家自然科学基金项目(19872211);交通部西部交通建设科技项目(2009 318 802 074)

摘　　要：采用压力板仪分别测试了1.184,1.263,1.348,1.424 g/cm3四种干密度玄武岩风化红土的土水特征脱湿曲线,试验结果显示:随着体积含水量的减小,基质吸力呈变大的趋势,其中在基质吸力小于800 kPa阶段,体积含水率随基质吸力变化显著;800 kPa以后,体积含水率随基质吸力的变化很小,最后趋于恒定值。试验同时还表明在同一吸力下,干密度大的试样有更高的含水量。采用Van Genuchten模型、Fredlund 3参数模型和Fredlund 4参数模型对试验结果进行拟合,确定不同干密度情况下试样各模型的拟合参数,分析拟合结果相关系数平方值都大于0.98,说明拟合效果很好。Soil-water characteristic curve of four kinds of weathered basalt laterite with dry density of 1.184,1.263,1.348,1.424 g/cm3 are separately tested using pressure plate extractor.The test results showed that matric suction trends to increase with volumetric water content decreased.When matric suction is less than 800 kPa,volumetric water content changed significantly with matric suction.When matric suction is more than 800 kPa,volumetric water content has little change with matric suction and finally trends to a constant value.It is also shown that under the same suction,the sample with larger dry density has higher water content.Then the test results were fitted using Van Genuchten model,Fredlund 3 parametric model and Fredlund 4 parametric model to determine the fitting parameters of each sample model under different dry density.Through analysis,the squared value of related coefficient of the fitting result is more than 0.98,which indicated good fitting results.

关 键 词：玄武岩风化红土 土水特征曲线 压力板仪 

分 类 号：TU446[建筑科学—岩土工程]