含水率对含黏砂土孔压、强度和变形的影响  

Effect of Water Content on Pore Pressure,Strength and Deformation of Clayey Sand

作　　者：张磊 陈正汉[2] 苗强强[2] 

机构地区：[1]75200部队 [2]后勤工程学院军事建筑工程系

出　　处：《后勤工程学院学报》2012年第5期10-15,共6页Journal of Logistical Engineering University

基　　金：广东省交通厅科技资助项目(200538)

摘　　要：为了研究非饱和含黏砂土的孔压、强度和变形特性,利用非饱和土三轴仪和微型传感器对路基非饱和含黏砂土进行不排水不排气三轴试验。结果表明:强度、黏聚力和内摩擦角随含水率呈非线性变化,在最优含水率附近存在一峰值;剪切过程中存在显著的剪胀性,随围压和含水率增大,剪胀性减弱;初始孔隙压力随含水率的增大而提高,随剪切的进行,先增大再减小;孔隙气压力与土样的体应变密切相关,剪缩时升高,剪胀时降低;在相同含水率情况下,孔隙气压力和孔隙水压力皆随围压增大而增大。In order to study the effect for pore pressure, strength and deformation of unsaturated clayey sand, undraining and unexhausting triaxial tests of some unsaturated sub-grade clayey sand have been implemented with a set of triaxial and several micro -sensors. The results show that the respective change of strength, cohesion and internal friction angle with water content appears non- linear function relationship, and there is a peak valve of each function curve near optimal water content. Dilatancy of sand samples appears obviously in shearing, and its degree decreases with the augment of confining pressure and water content. The initial pore pressure increases with the increase of water content, and increases firstly while decreases later in shearing. Pore air pressure varia- tion is closely related to volume strain of sand sample, and increases with shrinkage while decreases with dilatancy. For samples with same water content, both pore air pressure and pore water pressure increase with augment of confining pressure.

关 键 词：非饱和含黏砂土 不排水不排气 含水率 孔隙水压力 孔隙气压力 

分 类 号：TU41[建筑科学—岩土工程]