红砂岩风化土路基瞬态饱和区动弹性模量和阻尼比试验研究

doi:10.12141/j.issn.1000-565X.190091

华南理工大学学报（自然科学版） ›› 2019, Vol. 47 ›› Issue (11): 130-139.doi: 10.12141/j.issn.1000-565X.190091

红砂岩风化土路基瞬态饱和区动弹性模量和阻尼比试验研究

丁瑜¹ 陈晓斌^1,2† 王晅^1,2 张家生^1,2贾羽¹

1．中南大学土木工程学院，湖南长沙 410083;2．重载铁路工程结构教育部重点实验室，湖南长沙 410083

收稿日期:2019-03-12 修回日期:2019-07-24 出版日期:2019-11-25 发布日期:2019-10-02
通信作者: 陈晓斌(1978-)，男，博士，教授，主要从事交通岩土工程研究． E-mail:chen_xiaobin@csu.edu.cn
作者简介:丁瑜(1990-)，女，博士，主要从事路基动力学研究． E-mail:ding_yu@csu．edu．cn
基金资助:
国家自然科学基金资助项目( 51678575，51608533) ; 中国铁路总公司科技研究开发计划课题( 2016G003-B)

Experimental Investigation into Dynamic Elastic Modulus and Damping Ｒatio in Transient Saturated Zone of Ｒed Sandstone Residual Soil Subgrade

DING Yu¹ CHEN Xiaobin^1,2 WANG Xuan^1,2 ZHANG Jiasheng^1,2 JIA Yu¹

1． School of Civil Engineering，Central South University，Changsha 410083，Hunan，China; 2． MOE Key Laboratory of Engineering Structures of Heavy Haul Ｒailway，Central South University，Changsha 410083，Hunan，China

Received:2019-03-12 Revised:2019-07-24 Online:2019-11-25 Published:2019-10-02
Contact: 陈晓斌(1978-)，男，博士，教授，主要从事交通岩土工程研究． E-mail:chen_xiaobin@csu.edu.cn
About author:丁瑜(1990-)，女，博士，主要从事路基动力学研究． E-mail:ding_yu@csu．edu．cn
Supported by:
Supported by the National Natural Science Foundation of China( 51678575，51608533)

摘要/Abstract

摘要：

连续降雨后的红砂岩风化土路基瞬态饱和区土体骨干曲线、动弹性模量和阻尼比是进行路基动力特性分析的关键因素．为研究红砂岩风化土路基瞬态饱和区在重载列车荷载作用下的动力特性，采用中砂与不同含量红黏土重塑土样进行动三轴试验，探讨了细粒含量、围压对瞬态饱和区土体骨干曲线、动弹性模量和阻尼比的影响．研究表明: 含细粒砂土的骨干曲线符合 Konder 双曲线模型; 细粒含量对动弹性模量和阻尼比的影响并不是单调的，而是存在一个临界值，在临界值前后，动弹性模量和阻尼比随细粒含量的变化趋势相反，文中所用试样的临界细粒含量在 20% 左右; 围压对土体动弹性模量和阻尼比有显著的影响，随着围压的增大，动弹性模量增大，阻尼比减小．

关键词:

红砂岩风化土, 瞬态饱和区, 细粒含量, 围压, 骨干曲线, 动弹性模量, 阻尼比

Abstract: The red sandstone residual soil subgrade after a continuous rainfall will form a transient saturated zone， and the soil backbone curve，dynamic elastic modulus and damping ratio are the key factors for analyzing the dy- namic characteristics of the subgrade． In order to study the dynamic characteristics of red sandstone residual soil subgrade in transient saturated zone under heavy-haul train load conditions，dynamic tri-axial tests were carried out with sand and different content of red clay remolded soil samples． The effects of fines content and confining pressure on backbone curve，dynamic elastic modulus and damping ratio of soil in transient saturated zone were discussed． The results show that: the backbone curve of sand with fines content conforms to Konder hyperbolic model; the in- fluence of fines content on the dynamic elastic modulus and damping ratio is not monotonic，but there is a threshold ( about 20% ) ; the variation trends of dynamic elastic modulus and damping ratio negatively related with fines con- tent around the threshold; confining pressure has a significant effect on dynamic elastic modulus and damping ratio of soil: with the increase of confining pressure，the dynamic elastic modulus increases and the damping ratio de- creases．

Key words: red sandstone residual soil, transient saturated zone, fines content, confining pressure, backbone curve, dynamic elastic modulus, damping ratio

丁瑜, 陈晓斌, 王晅, 等. 红砂岩风化土路基瞬态饱和区动弹性模量和阻尼比试验研究[J]. 华南理工大学学报（自然科学版）, 2019, 47(11): 130-139.

DING Yu, CHEN Xiaobin, WANG Xuan, et al. Experimental Investigation into Dynamic Elastic Modulus and Damping Ｒatio in Transient Saturated Zone of Ｒed Sandstone Residual Soil Subgrade[J]. Journal of South China University of Technology (Natural Science Edition), 2019, 47(11): 130-139.

红砂岩风化土路基瞬态饱和区动弹性模量和阻尼比试验研究

Experimental Investigation into Dynamic Elastic Modulus and Damping Ｒatio in Transient Saturated Zone of Ｒed Sandstone Residual Soil Subgrade

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