自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

您目前所在的位置:首页 - 期刊简介 - 详细页面

中南大学学报(自然科学版)

Journal of Central South University

第50卷    第1期    总第293期    2019年1月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1672-7207(2019)01-0139-07
水泥改良泥质板岩粗粒土的静力特性
刘雨1,陈俊桦2,朱自强1

(1. 中南大学 地球科学与信息物理学院,湖南 长沙,410012;
2. 中南大学 土木工程学院,湖南 长沙,410075
)

摘 要: 针对泥质板岩粗粒土,通过大型静三轴压缩试验研究未改良土样和水泥改良土样的轴向应力-轴向应变关系、体积应变-轴向应变关系、抗压强度、内摩擦角、黏聚力和弹性模量等,根据试验结果对水泥改良土和未改良土的力学性质进行比较。研究结果表明:水泥改良土和未改良土均具有应变软化性和剪胀性,改良土的应变软化性和剪胀性均比未改良土的显著;水泥改良土的最大体积压缩应变、与最大体积压缩应变对应的轴向应变均比未改良土的小,而残余体积膨胀变形比未改良土的大;水泥改良土破坏时变形比未改良土的小;与未改良土相比,水泥改良土的抗压强度、黏聚力和弹性模量均显著提高,线弹性变形范围也显著扩大,但内摩擦角的变化不大;水泥改良效果良好,水泥改良提高了泥质板岩粗粒土的力学性能。

 

关键字: 土力学;水泥改良土;大型静三轴压缩试验;应变软化;剪胀

Static mechanical properties of argillaceous slate coarse-grained soil improved by cement
LIU Yu1, CHEN Junhua2, ZHU Ziqiang1

1. School of Geosciences and Info-Physics, Central South University, Changsha 410012, China;
2. School of Civil Engineering, Central South University, Changsha 410075, China

Abstract:Large scale static triaxial compressive tests were carried out to study the mechanical properties of argillaceous slate coarse-grained soil and the argillaceous slate coarse-grained improved by cement. Axial stress-strain relation, volumetric strain-axial strain relation, compressive strength, internal fraction angel, cohesion and elastic modulus of soil samples were obtained by the tests. Comparisons of test results between the improved soil and the unimproved soil were conducted. The results show that the soil improved by cement as well as the unimproved soil has mechanical properties of strain softening indicated by the axial stress-strain relation and dilatancy indicated by the volumetric strain-axial strain relation. Both the strain softening and dilatancy of the improved soil are more remarkable than those of the unimproved soil. The maximum compressive volumetric strain of the soil improved by cement and the axial strain corresponding to the maximum one are smaller than those of the unimproved soil, while the residual volumetric dilatancy of the soil improved by cement is larger than that of the unimproved soil. The failure strain of the improved soil is smaller than that of the unimproved soil. Compared to the unimproved soil, the compressive strength, the cohesion, the elastic modulus and the range of linear elastic deformation of the improved soil are enhanced significantly, while there is not much change to the internal fraction angle. As the mechanical properties of the argillaceous slate coarse-grained soil are improved by cement, the effects of the soil improvement are good.

 

Key words: soil mechanics; soil improved by cement; large scale static triaxial compressive test; strain softening; dilatation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
版权所有:《中南大学学报(自然科学版、英文版)》编辑部
地 址:湖南省长沙市中南大学 邮编: 410083
电 话: 0731-88879765(中) 88836963(英) 传真: 0731-88877727
电子邮箱:zngdxb@csu.edu.cn 湘ICP备09001153号