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冰川冻土 ›› 2015, Vol. 37 ›› Issue (4): 1002-1008.doi: 10.7522/j.issn.1000-0240.2015.0111

• 寒区科学与技术 • 上一篇    下一篇

冻土单轴抗压强度影响因素的试验研究

蔡正银1, 吴志强1, 黄英豪1, 侯伟1 2   

  1. 1. 南京水利科学研究院 岩土工程研究所, 江苏 南京 210024;
    2. 同济大学 地下建筑与工程系, 上海 200092
  • 收稿日期:2014-11-07 修回日期:2015-03-19 出版日期:2015-08-25 发布日期:2016-01-18
  • 作者简介:蔡正银(1965-), 男, 江苏南通人, 教授级高级工程师, 2001年在香港科技大学获博士学位, 现主要从事土的基本性质与土工测试、 土的本构理论、 构筑物与地基基础离心模拟技术方面的工作. E-mail: zycai@nhri.cn.
  • 基金资助:
    水利部公益性行业科研专项“咸寒区灌渠冻害评估预报与处治技术”项目(201201037); 南京水利科学研究院国家重点实验室基本科研业务费项目(Y314006)资助

Experimental study on the factors influencing the uniaxial compressive strength of frozen soil

CAI Zhengyin1, WU Zhiqiang1, HUANG Yinghao1, HOU Wei1 2   

  1. 1. Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210029, China;
    2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
  • Received:2014-11-07 Revised:2015-03-19 Online:2015-08-25 Published:2016-01-18

摘要: 新疆地区是我国典型的咸寒区, 渠基土在冬季的冻结引起了输水渠道衬砌的破坏. 为了解冻结状态下渠基土的物理力学特性, 在常应变率条件下对新疆北疆季节性冻土区的含硫酸钠渠基土进行了多种条件下的单轴抗压强度试验. 结果表明: 单轴抗压强度随温度的降低线性增加; 单轴抗压强度随干密度的增加而增大, 二者之间具有较好的幂函数关系. 与氯化钠盐渍土不同, 硫酸盐渍土的单轴抗压强度随着硫酸钠含量的升高而增大, 并且呈现近似线性增加的特性.

关键词: 单轴抗压强度, 温度, 干密度, 硫酸盐渍土

Abstract: The Xinjiang Uygur Autonomous Region is a typical salty cold region, where the conveyance channels are severely damaged by the frost heave and salt expansion of the channel bed soil. To study the soil properties and solve this problem, a series of uniaxial compressive strength tests at-5 ℃,-10 ℃,-15 ℃ and-20 ℃, with salt content of 0.2%, 1.6%, 3.0% and 4.4%, under the dry density of 1.89 g·cm-3, 1.85 g·cm-3, 1.80 g·cm-3and 1.70 g·cm-3, respectively, have been conducted. The test results show that the uniaxial compressive strength is sensitive to temperature; the uniaxial compressive strength increases with temperature decreasing at different salt contents and there is a power function relationship between the uniaxial compressive strength and dry density; moreover, uniaxial compressive strength of this saline soil with Na2SO4is different from that with NaCl. The experiment data at the four temperatures and the four dry densities indicate that the more the Na2SO4, the higher the strength.

Key words: frozen soil, uniaxial compressive strength, temperature, dry density, sulfate saline soil

中图分类号: 

  • TU 443