粘土的动力特性试验  

Experimental study of the dynamic characteristics of clay

作　　者：赵玉[1] 李衍赫 张培[3] 赵科[3] 刘伟超[1] 

机构地区：[1]石家庄铁道大学土木工程学院,石家庄050043 [2]浙江大学建筑工程学院,杭州310058 [3]石家庄学院经济管理学院,石家庄050035

出　　处：《吉林大学学报（工学版）》2015年第6期1791-1797,共7页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51309153)

摘　　要：通过GDS动三轴试验,以某实际工程场地粘土为研究对象,研究了粘土的动模量和阻尼比特性。研究结果表明,1/Ed-εd关系曲线可近似用直线方程来描述,固结围压与振动频率对阻尼比的影响较小,而随固结比的增大,阻尼比曲线呈现跳跃式变化。通过对各试验参数建立一定精度范围内的经验公式,发现(Edmax/Pa·kc)-(σm/Pa)关系曲线进行归一化处理后可采用直线方程来描述,(λd/λdmax)与(1-Gd/Gdmax)关系曲线进行归一化处理后可用幂函数来描述,其归一化方程使用方便,可为实际工程应用提供参考。The clay collected from an engineering site is studied with GDS cyclic triaxial test to analyze the characteristics of dynamic modulus and damping ratio.It is shown that the 1/Ed-εdcurve can be described by the approximate linear equation and the confining pressure and vibration frequency have little influence on the damping ratio.However,the change of damping ratio curve is saltatory with the increase in consolidation ratio.Through the establishment of empirical formula of the test parameters in a certain precision range,the（Edmax/Pa·kc）-（σm/Pa）curve could be expressed by linear equations after normalization processing,the curve（λd/λdmax）and（1-Gd/Gdmax）could be expressed by the power function after normalization processing.These functions can be easily used and provide reference for practical engineering.

关 键 词：土木工程 粘土 滞回圈 动三轴 动弹模量 动剪模量比 阻尼比 

分 类 号：TU411[建筑科学—岩土工程]