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冰川冻土 ›› 2014, Vol. 36 ›› Issue (6): 1496-1501.doi: 10.7522/j.issn.1000-0240.2014.0179

• 寒区科学与技术 • 上一篇    下一篇

高压条件下土的冻融试验装置研制及应用

关辉, 王大雁, 顾同欣, 马巍, 温智, 王永涛   

  1. 中国科学院 寒区旱区环境与工程研究所 冻土工程国家重点实验室, 甘肃 兰州 730000
  • 收稿日期:2014-03-11 修回日期:2014-07-07 出版日期:2014-12-25 发布日期:2015-01-20
  • 作者简介:关辉(1986-),男,河南焦作人,2008年毕业于西安科技大学,现为博士研究生,主要从事冻土物理学与冻土工程方面的研究工作.E-mail:guanhui_cas@163.com
  • 基金资助:
    国家自然科学基金项目(41071048); 国家重点基础研究发展计划(973计划)项目(2012CB026106); 中国科学院知识创新工程重要方向性项目(KZCX2-YW-QN307)资助

Development and application of a new soil freezing-thawing test apparatus for high loading conditions

GUAN Hui, WANG Dayan, GU Tongxin, MA Wei, WEN Zhi, WANG Yongtao   

  1. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
  • Received:2014-03-11 Revised:2014-07-07 Online:2014-12-25 Published:2015-01-20

摘要: 深部土体冻融后的物理力学性质对深部人工冻结工程意义重大. 针对该问题, 在以往土的冻融试验装置的基础上, 设计出适用于高压条件下土的室内冻融试验装置, 并给出了高压条件下土的冻融试验方法. 基于该装置, 对有压条件下兰州黄土在不同冷端温度下的单向冻结特征进行了试验研究. 结果表明: 无压单向冻结过程中土的变形以冻胀为主, 而高压情况下则主要表现为压缩变形. 在有压单向冻结过程中, 试样内部仍然存在着明显的水分重分布过程. 试验分析表明, 该试验装置能够为高压条件下土的冻结特征及冻融作用后土的物理力学性质研究提供技术支持.

关键词: 冻土, 高压条件, 冻融试验, 水分迁移

Abstract: Studies on the physical and mechanical properties of soil under freezing-thawing cycles are of great significance for the stability of deep artificial freezing engineering. Based on previous apparatuses, in the paper, a new soil freezing-thawing test apparatus for high loading conditions was developed and related test procedures were suggested. Using the apparatus, the freezing characteristics of Lanzhou loess under different cold-end temperatures were tested and analyzed. Results indicate that the soil specimen exhibits frost heaving as no loading during freezing, but exhibits compression under high external load. Besides, obvious water migration occurs during soil freezing under loading without external water supply. It is found that this new apparatus can offer an efficient technical support for studies of the physical and mechanical properties of soil under loading conditions during and after freezing-thawing cycles.

Key words: frozen soil, high loading conditions, freezing-thawing test, water migration

中图分类号: 

  • P642.14