非饱和抗剪强度指标c、φ值与含水率w的关系  

Relationship Between Water Content w and Unsaturated Soil Strenth Indices c and φ

作　　者：李金玉[1,2] 杨庆[1,2] 孟长江[1,2] 

机构地区：[1]大连理工大学土木水利学院岩土工程研究所,辽宁大连116085 [2]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116085

出　　处：《岩土工程技术》2010年第5期243-247,共5页Geotechnical Engineering Technique

基　　金：国家自然科学基金资助项目:非饱和膨胀土强度与本构模型的试验研究与理论分析(50679015)

摘　　要：非饱和土力学已经确认了基质吸力与非饱和土的强度指标有关,而基质吸力与含水率有着密切的关系。通过理论和三轴剪切试验分析,探讨了非饱和残积土抗剪强度指标c、φ与含水率ω变化的一般规律;同时结合已经推出的土水特征曲线关系,探讨抗剪强度指标c、φ与基质吸力μ的变化的一般规律。结果表明:随着非饱和土含水率ω增加、基质吸力μ的减小,黏聚力c有减少的趋势,内摩擦角φ变化不大。通过线性回归分析,黏聚力与含水率成半对数线性关系,黏聚力与基质吸力成线性关系。现有的非饱和土实用公式精确性较差,非饱和土抗剪强度指标有待进一步的研究与完善。It is proved that shear strength of unsaturated soil is related to matric suction. However matric suction has close relationship with water content. Based on the results of the laboratory test and theoretic analysis, the effect of water content on unsaturated soil shear strength indices c and φ is investigated. At the same time, the effect of matric suction on unsaturated soil shear strength indices c and φ is discussed by the soil-water characteristic curve（SWCC）. Based on the tests,the value of c decreases as the value of water content w increases and the value of matfic suctionμ decreases. The value of φ has little change By linear regression analysis, the conclusions is indicated that cohesion has semilog linear relationship with water content and cohesion is directly proportional to matric suction. The precisions of the previous aren＇t satisfied and further research is needed. With the development of unsaturated soil mechanics, researches on unsaturated soil shear strength indices should be strengthened.

关 键 词：非饱和土 含水率 黏聚力 基质吸力 抗剪强度指标 土水特征曲线 

分 类 号：TU411.7[建筑科学—岩土工程]