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含水率和含盐量对冻土无侧限抗压强度影响的试验研究

蔡正银, 吴志强, 黄英豪, 曹永勇, 魏雁冰

蔡正银, 吴志强, 黄英豪, 曹永勇, 魏雁冰. 含水率和含盐量对冻土无侧限抗压强度影响的试验研究[J]. 岩土工程学报, 2014, 36(9): 1580-1586. DOI: 10.11779/CJGE201409002
引用本文: 蔡正银, 吴志强, 黄英豪, 曹永勇, 魏雁冰. 含水率和含盐量对冻土无侧限抗压强度影响的试验研究[J]. 岩土工程学报, 2014, 36(9): 1580-1586. DOI: 10.11779/CJGE201409002
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CAI Zheng-yin, WU Zhi-qiang, HUANG Ying-hao, CAO Yong-yong, WEI Yan-bing. Influence of water and salt contents on strength of frozen soils[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(9): 1580-1586. DOI: 10.11779/CJGE201409002
Citation: CAI Zheng-yin, WU Zhi-qiang, HUANG Ying-hao, CAO Yong-yong, WEI Yan-bing. Influence of water and salt contents on strength of frozen soils[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(9): 1580-1586. DOI: 10.11779/CJGE201409002
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含水率和含盐量对冻土无侧限抗压强度影响的试验研究  English Version

  • 南京水利科学研究院岩土工程研究所,江苏 南京 210024)科学研究院国家重点实验室基本科研业务费项目（Y314006

基金项目: 水利部公益性行业科研专项项目（201201037）; 南京水利
详细信息
    作者简介:

    蔡正银(1965- ),男,教授级高级工程师,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研究工作。E-mail: zycai@nhri.cn。

  • 中图分类号: TU445

Influence of water and salt contents on strength of frozen soils

  • Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China

摘要

    摘要
  • 摘要: 为了探索冻土的力学性质,开展了不同含水率、不同Na2SO4含量条件下冻结低液限黏土的无侧限抗压强度试验,探讨了含水率、Na2SO4含量对冻土应力应变特性、强度与破坏类型的影响,以及冻土无侧限抗压强度与上述两影响因素之间的关系。试验结果表明：随着含水率的升高,冻土逐渐表现出塑性;Na2SO4含量越高,脆性破坏特性越显著。冻土强度随含水率和Na2SO4含量的升高先增加,达到最大强度后迅速降低,最大强度对应的含水率为17.5%。含水率为13.5%时,最大强度对应的Na2SO4含量为4.4%,含水率为15.5%与17.5%时,最大强度对应的Na2SO4含量为5.8%。
    Abstract: In order to study the mechanical properties of frozen soils, a series of uniaxial compressive strength tests are conducted with water content of 9.5%, 11.5%, 13.5%, 15.5%, 17.5% and saturated conditions at -10℃, and with salt content of 0.2%, 1.6%, 3.0%, 4.4%, 5.8%, 7.2% and 8.6% at -15℃ respectively. According to the test results, the stress-strain relationship, uniaxial compressive strength and destruction type are strongly affected by the water and salt contents of the soils. The test results show that the uniaxial compressive strength increases with the increasing water and salt contents firstly, then it decreases rapidly after reaching its peak. The water content corresponding to the peak strength is 17.5% regardless of the salt content and dry density of the soils. But the salt content corresponding to the peak strength varies under different water contents: under the water content of 13.5%, the strength reaches its peak under the salt content of 4.4%; under the water content of 15.5% and 17.5%, the strength reaches its peak under the salt content of 5.8%.
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出版历程
  • 收稿日期:  2014-02-06
  • 发布日期:  2014-09-21

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