不同初始饱和度红砂岩冻融后物理力学性质研究
投稿时间:2020-10-16  修订日期:2020-11-01  点此下载全文
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作者单位E-mail
沈世伟 吉林大学 ssw2580@jlu.edu.cn 
吴飞 吉林大学 1262315977@qq.com 
甘霖 吉林大学  
姜满 吉林大学  
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:对不同初始饱和度红砂岩冻融循环前后进行物理及力学试验研究,探讨初始饱和度对红砂岩冻融损伤的影响。本文设定红砂岩试样初始饱和度为20%、40%、60%、80%、100%,冻融次数设定为20次,对冻融前后试样分别测定质量、纵波波速以及进行单轴压缩试验。试验结果表明:1)冻融后不同初始饱和度红砂岩的物理性质发生变化,纵波波速降低、质量减小,但变化程度不同;2)随饱和度的增大,试样经冻融后峰值强度和弹性模量均呈降低趋势,但只有饱和度大于60%时,降低趋势较明显。本文研究为寒区隧道及地下工程建设以及岩土地质灾害监测与治理提供理论依据和试验基础。
中文关键词:红砂岩  初始饱和度  冻融循环  物理力学性质  损伤
 
Study on physical and mechanical properties of red sandstone after freeze-thaw with different initial saturation
Abstract:The effects of initial saturation on freeze-thaw damage of red sandstone were studied by physical and mechanical experiments before and after freeze-thaw cycles.In this paper, the initial saturation of the red sandstone sample was set as 20%, 40%, 60%, 80% and 100%, and the number of freeze-thaw cycles was set as 20. The mass, p-wave velocity and uniaxial compression tests of the sample before and after freeze-thaw were measured respectively.The experimental results show that: 1) After freeze-thaw, the physical properties of red sandstone with different initial saturation change to different degrees, and the p-wave velocity and mass decrease.2) With the increase of saturation, the uniaxial compressive strength and elastic modulus of the sample decrease to different degrees after freezing-thawing, but only when the saturation is greater than 60%, the decreasing trend is more obvious.It provides theoretical basis and experimental basis for engineering construction and geotechnical engineering instability monitoring and control in cold region.
keywords:Red sandstone  initial saturation  freeze-thaw cycle  physical and mechanical properties  damage
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