不同含水量下原状黄土的动力变形特性  

Dynamic Deformation Characteristics of Intact Loess under Different Water Content

作　　者：陈存礼[1] 何军芳[1] 高鹏 

机构地区：[1]西安理工大学岩土工程研究所 [2]郑州核工业勘查研究院,河南郑州450002

出　　处：《西安理工大学学报》2006年第4期390-394,共5页Journal of Xi'an University of Technology

基　　金：陕西高校省级重点实验室重点科研项目(03JS038;05JS32);西安理工大学高学历人员科研启动基金项目(220603)

摘　　要：通过在不同固结应力条件下对不同湿度西安原状黄土的动三轴实验,研究了不同湿度原状黄土的动应力应变关系、动模量、阻尼比特性。实验结果表明:①在不同固结应力条件下,不同湿度原状黄土的动应力应变关系符合双曲线模型,固结应力条件、含水量变化对动应力应变关系有明显的影响,但对动剪切模量比与动剪应变比关系基本没有影响;②不同含水量下模型中起始动剪切模量、最大动应力两个参数和固结平均主应力与固结应力比两者之积之间均有良好的幂函数关系,且对不同固结应力状态可以归一,而此幂函数关系式的系数与含水量之间也呈幂函数关系;③原状黄土的动阻尼比随动应变的增大而呈逐渐上升的趋势,阻尼比与动应变关系在半对数坐标系中呈线性关系,且对不同固结应力条件和不同含水量可以近似归一。The relationship of some dynamic characteristics among dynamic stress and strain, shear modulus and damping is studied by dynamic triaxial tests on Xi＇an intact loess with various moisture under different consolidation stress conditions. The experiment results indicate. （1）The relationship between dynamic stress and strain of intact loess with various moisture can he described with hyperbola, which is influenced by the variations of consolidation stress conditions and water content very much, but the relationship between the ratio of dynamic shear modulus and the ratio of dynamic shear strain is little influenced by that; （2）Relationships between its two parameters（the maximum dynamic shear modulus, the maximum dynamic shear stress）and the product of consolidation mean principal stress and consolidation stress ratio can be described with power function which are almost identical under different consolidation stress conditions, and the relationship between the power function＇s factors and water content also can be described with power function; （3）Damping ratio of intact loess gradually increases with an increase in dynamic shear strain. Damping ratio-dynamic shear strain relationship is linear in half logarithm coordinate, which is almost independent of consolidation stress conditions and water content.

关 键 词：原状黄土 含水量 动三轴试验 动模量 阻尼比 

分 类 号：TU443[建筑科学—岩土工程]