长平高速公路典型原状粉质粘土静动力学特性  

Static and dynamic mechanics properties of undisturbed silty clay of Changchun-Siping Highway

作　　者：张锋[1,2] 冯德成[1] 凌贤长[2] 李琼林[2] 王加辉[2] 

机构地区：[1]哈尔滨工业大学交通科学与工程学院,哈尔滨150090 [2]哈尔滨工业大学土木工程学院,哈尔滨150090

出　　处：《哈尔滨工业大学学报》2012年第8期11-16,共6页Journal of Harbin Institute of Technology

基　　金：国家重点基础研究发展计划资助项目(2012CB026104);高等学校博士学科点专项科研基金资助项目(20092302110053);国家自然科学基金资助项目(51078111;51174261)

摘　　要：为了研究长(春)-(四)平高速公路路基典型原状粉质粘土静、动力学特性,分别进行了不同围压条件下固结不排水静三轴试验和共振柱试验.结果表明:长期运营后,公路路基原状粉质粘土的静、动力学性能与其先期固结状态有关;随着围压的增加,土体静强度增加,最大弹性模量增大;最大动剪切模量、参考剪应变幅值与固结围压呈线性增加关系;而最大阻尼比和阻尼比拟合参数随围压的升高而变化甚微.据此,给出了长平高速公路路基不同断面原状粉质粘土修改后的邓肯-张模型参数,以及最大动剪切模量、参考剪应变幅值最大阻尼比和阻尼比拟合参数的推荐值.To investigate the static and dynamic mechanics properties of undisturbed silty clay sampled from the subgrade of Changchun-Siping highway,the consolidation undrained triaxial test and resonant column test were carried out under different confine pressures.Test results show that the properties of undisturbed silty clay are relate to the pre-consolidation condition.With the increasing of confine pressure,the static strength and the maximum elastic modulus increase.The relationship between maximum dynamic shear modulus,reference shear strain amplitude and confine pressure display a linear formulation.The confine pressure plays a little influence on the maximum damping ratio and the fitting parameters of damping ratio.Based on these,Duncan-Chang model parameters,maximum dynamic shear modulus and reference shear strain amplitude with the confine pressure were quantified.

关 键 词：原状粉质粘土 力学特性 固结不排水三轴试验 共振柱试验 长(春)-(四)平高速公路 

分 类 号：TU411[建筑科学—岩土工程]