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

作　　者：牛江宇 靳鹏伟[2] 李栋伟[1] 吕晶晶[1] 

机构地区：[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

出　　处：《冰川冻土》2015年第2期428-433,共6页Journal of Glaciology and Geocryology

基　　金：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

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.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 show ed 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 ow ing to the increase in salinity and test temperature.

关 键 词：冻结盐渍砂土 单轴抗压强度 含盐量 弹性模量 

分 类 号：P642.14[天文地球—工程地质学]