冻结盐渍砂土单轴强度特性研究

doi:10.7522/j.issn.1000-0240.2015.0048

冰川冻土 ›› 2015, Vol. 37 ›› Issue (2): 428-433.doi: 10.7522/j.issn.1000-0240.2015.0048

冻结盐渍砂土单轴强度特性研究

牛江宇¹, 靳鹏伟², 李栋伟¹, 吕晶晶¹

1. 安徽理工大学土木建筑学院, 安徽淮南 232001;
2. 湖南科技学院, 湖南永州 425199

收稿日期:2014-09-10 修回日期:2015-02-21 出版日期:2015-04-25 发布日期:2015-06-06
通讯作者: 靳鹏伟, E-mail: jpw960@163.com. E-mail:jpw960@163.com
作者简介:牛江宇(1990-), 男, 山西霍州人, 2012年毕业于山西大学, 现为安徽理工大学在读硕士研究生, 主要从事人工冻土物理力学性质研究. E-mail: xiaoniu_de@163.com
基金资助:
国家自然科学基金项目(412306306; 41271071); 教育部新世纪人才基金项目(NETC-887); 安徽省自然科学基金项目(1308085ME60)资助

Study of the uniaxial compressive strength of frozen saline sandy soil

NIU Jiangyu¹, JIN Pengwei², LI Dongwei¹, LÜ Jingjing¹

1. Department of Civil Engineering, Anhui University of Science and Technology, Huainan 232001, Anhui, China;
2. Hunan University of Science and Engineering, Yongzhou 425199, Hunan, China

Received:2014-09-10 Revised:2015-02-21 Online:2015-04-25 Published:2015-06-06

摘要/Abstract

摘要：

通过对兰州盐渍砂土重塑土添加不同量的盐分来模拟不同含盐量的盐渍土, 并对其进行单轴抗压试验, 分析其在不同含盐量、不同温度及不同速率的应变加载情况下, 冻结盐渍砂土的单轴抗压强度的变化规律, 重点讨论了盐分对土体力学参数的影响以及弹性模量与含盐量、温度的关系. 结果表明: 易溶盐含量的增加会导致单轴抗压强度逐渐降低, 试验温度越低抗压强度会越大; 应变加载速率的增加会增大土体的单轴抗压强度, 同时会缩短土体达到应力峰值的时间; 土体含盐量越大弹性模量越小, 温度越低弹性模量越大.

关键词: 冻结盐渍砂土, 单轴抗压强度, 含盐量, 弹性模量

Abstract:

A test program was conducted on the remolded frozen saline sandy soil of a roadbed construction project in Lanzhou to investigate the variation of uniaxial compressive strength with different salinities, test temperatures and strain rates. In this paper, the physical and mechanical properties of the frozen saline sandy soil and the relationships among the elastic modulus, test temperatures and salinities are investigated. The experiment results showed that the increase of the content of soluble salt will lead to gradually reduce the uniaxial compressive strength of frozen saline sandy soil, but the uniaxial compressive strength of frozen saline sandy soil will increase with the decrease of the test temperature correspondingly. The time to reaches the peak compressive strength will shorten and the uniaxial compressive strength of frozen saline sandy soil will increase, when the strain rate increase and the elastic modulus decrease owing to the increase in salinity and test temperature.

Key words: frozen saline sandy soil, uniaxial compressive strength, salt content, elastic modulus

中图分类号:

P642.14

牛江宇, 靳鹏伟, 李栋伟, 吕晶晶. 冻结盐渍砂土单轴强度特性研究[J]. 冰川冻土, 2015, 37(2): 428-433.

NIU Jiangyu, JIN Pengwei, LI Dongwei, LÜ Jingjing. Study of the uniaxial compressive strength of frozen saline sandy soil[J]. JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY, 2015, 37(2): 428-433.

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冻结盐渍砂土单轴强度特性研究

Study of the uniaxial compressive strength of frozen saline sandy soil

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