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冰川冻土 ›› 2018, Vol. 40 ›› Issue (3): 539-545.doi: 10.7522/j.issn.1000-0240.2018.0058

• 寒区科学与技术 • 上一篇    下一篇

高温冻结砂土温度界限试验研究

郭雪鸾1, 齐吉琳1, 党博翔1, 董兆仁2   

  1. 1. 北京建筑大学 土木与交通工程学院, 北京 100044;
    2. 山东省昌乐县高级技工学校, 山东 潍坊 262400
  • 收稿日期:2018-02-27 修回日期:2018-04-12 出版日期:2018-06-25 发布日期:2018-07-16
  • 通讯作者: 齐吉琳,E-mail:jilinqi@bucea.edu.cn E-mail:jilinqi@bucea.edu.cn
  • 作者简介:郭雪鸾(1993-),女,北京人,2016年在北京建筑大学获学士学位,现为北京建筑大学在读硕士研究生,从事岩土工程研究.E-mail:guoxueluan@163.com
  • 基金资助:
    国家自然基金面上项目(41572268);北京市自然基金委-市教委联合重点项目(KZ201810016020);北京市属高等学校高层次人才引进与培养计划项目(CIT&TCD20150101)资助

Experimental study on temperature threshold for warm frozen sand in terms of mechanical properties

GUO Xueluan1, QI Jilin1, DANG Boxiang1, DONG Zhaoren2   

  1. 1. School of Civil and Transportation Engineering, Beijing University of Architecture and Civil Engineering, Beijing 100044, China;
    2. Changle Senior Technical School, Weifang 262400, Shandong, China
  • Received:2018-02-27 Revised:2018-04-12 Online:2018-06-25 Published:2018-07-16

摘要: 由于高温冻土力学特性与融土相近,对其研究越来越多,然而迄今并没有一个广为接受的基于力学指标的明确定义。以冻结饱和标准砂为研究对象,利用三轴剪切试验和侧限压缩试验获得黏聚力、割线变形模量和压缩指数等力学指标,通过分析这些指标随温度变化的规律,试图从力学特性的角度对于高温冻结砂土给出一个明确的温度界限。研究发现,冻结砂土在-1.0℃到-0.5℃之间,黏聚力、割线变形模量和压缩指数等力学指标发生突变,因此,将-1.0℃定义为高温冻结砂土的温度界限,对涉及高温冻土的工程建设和维护具有重要的意义。

关键词: 高温冻土, 力学性质, 温度界限, 标准砂

Abstract: Mechanical properties of warm frozen soils are similar to that of unfrozen soils. Recently, the mechanical properties of warm frozen soils have been extensively studied, including strength criteria, compression feature and constitutive models. However, there is no definition of warm frozen soil according to the mechanical behavior of frozen soils so far. This paper attempts to define the temperature threshold for warm frozen sand in terms of mechanical properties. The Chinese ISO standard sand was taken as study object. Triaxial and confined compression tests were carried out. Mechanical properties such as, cohesion, modulus and compressibility index were obtained and their changing tendency along with temperature were analyzed. It is found that the range of -1.0℃ to -0.5℃ seems to be the temperature when the mechanical properties change abruptly. Therefore, -1.0℃ can be defined as the temperature threshold for warm frozen soils with regard to the material tested in this program. The research is of great significance to construct and maintain the engineering in warm frozen soils.

Key words: warm frozen soil, mechanical properties, temperature threshold, Chinese ISO standard sand

中图分类号: 

  • P642.14