黄泛区粉砂土动剪切模量和阻尼比试验研究  

Experimental Study on Dynamic Shear Modulus and Damping Ratio of Silty Soil in the Yellow River Flooded Area

作　　者：董正方[1,2] 翟鹏飞 曾繁凯 李家勇 张群生 DONG Zhengfang;ZHAI Pengfei;ZENG Fankai;LI Jiayong;ZHANG Qunsheng(Henan University Instiute of Geotechnical and Rail Trans port Engineering,Henan Kaifeng 475004,China;Henan Provincial Research Center of Engineering on Intelligent Construction of Rail Transit,Henan Kaifeng 475004,China)

机构地区：[1]河南大学岩土与轨道交通工程研究所,河南开封475004 [2]河南大学河南省轨道交通智能建造工程技术中心,河南开封475004

出　　处：《河南大学学报（自然科学版）》2020年第3期332-340,共9页Journal of Henan University:Natural Science

基　　金：国家自然科学基金项目(51408195,51608174);河南省高等学校青年骨干教师培养计划(2018GGJS018);河南省科技攻关计划(192102310279);河南省高等学校重点科研项目资助计划(19A560008);开封市科技发展计划项目(1603110)。

摘　　要：为研究黄泛区粉砂土的动剪切模量和阻尼比,通过动三轴试验,分别选择3种不同的含水率、围压和固结比作为影响因素进行研究.选用Hardin-Drnevich、Ramberg-Osgood和Davidenkov 3种常用的动本构模型对黄泛区粉砂土的Gd/Gmax-γd关系进行拟合,并将拟合结果与试验结果做对比分析.结果表明:粉砂土的动剪切模量比随动剪应变的增加而减小;阻尼比随动剪应变的增加整体上呈现上升的趋势;修正参数的Ramberg-Osgood动本构模型对粉砂土Gd/Gmax-γd关系曲线拟合效果最好.In order to study the dynamic shear modulus and damping ratio of silty soil in Yellow River flooded area.In this paper,the moisture content,confining pressure and consolidation ratio were selected as the influencing factors through dynamic triaxial test,Then,three commonly used dynamic constitutive models,namely,Hardin-Drnevich、Ramberg-Osgood and Davidenkov,were used to fit the Gd/Gmax-γd relationship of the silty soil in the Yellow River flooded area,and the fitting results were compared with the test results.The results show that:the dynamic shear modulus ratio of silty soil decreases with the increase of dynamic shear strain;the damping ratio increases with the increase of dynamic shear strain as a whole;the Ramberg-Osgood dynamic constitutive model with modified parameters has a good fitting effect on the relation curve of Gd/Gmax-γd volume of silty soil.

关 键 词：岩土动力学 动剪切模量 阻尼比 黄泛区 粉砂土 

分 类 号：TU411.8[建筑科学—岩土工程]