高含冰(水)量冻土的单轴抗压强度变化特性研究

doi:10.7522/j.issn.1000-0240.2014.0145

冰川冻土 ›› 2014, Vol. 36 ›› Issue (5): 1213-1219.doi: 10.7522/j.issn.1000-0240.2014.0145

高含冰(水)量冻土的单轴抗压强度变化特性研究

杜海民, 张淑娟, 马巍

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:2014-01-24 修回日期:2014-05-11 出版日期:2014-10-25 发布日期:2014-11-19
通讯作者: 张淑娟, E-mail:sjzhang@lzb.ac.cn E-mail:sjzhang@lzb.ac.cn
作者简介:杜海民(1987-), 男, 陕西铜川人, 2011年毕业于西安科技大学, 现为中国科学院寒区旱区环境与工程研究所在读博士研究生, 主要从事冻土力学方面的研究. E-mail:duhaimin@lzb.ac.cn
基金资助:
优秀国家重点实验室专项基金项目(41023003);国家重点基础研究发展计划(973计划)项目(2012CB026102);冻土工程国家重点实验室自主课题(SKLFSE-ZT-07;SKLFSE-ZY-02)资助

Study of the uniaxial compressive strength characteristics of frozen soil with high ice/water content

DU Haimin, ZHANG Shujuan, MA Wei

State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China

Received:2014-01-24 Revised:2014-05-11 Online:2014-10-25 Published:2014-11-19

摘要/Abstract

摘要：

沿用已有的制样方法, 在统一了制样过程中冰、水比例及冰颗粒尺寸的基础上, 开展了高含冰(水)量粉质砂土的单轴抗压强度系统性测试. 结果表明: 高含冰(水)量冻土的单轴抗压强度随应变率的增加而非线性增大; 随温度升高而减小, 减小趋势与总含水量有关. 随含水量的增加, 强度先是非线性增大, 然后逐渐趋于重塑冰的强度, 这有别于早期类似研究的结果. 同时, 也对试样中加入冰颗粒以保证试样高含冰(水)量的制备方法合理性产生了质疑.

关键词: 高含冰(水)量冻土, 单轴抗压强度, 应变率, 温度, 含水量

Abstract:

Silty sand with high ice/water content was tested under uniaxial compression on the basis of the previous method of specimen preparation and unifying the weight ratio of ice to water. It is found that uniaxial compressive strength of frozen silty sand nonlinearly increases with increasing strain rate, but the increasing rate gradually decreases with the increase of strain rate, and the relationship between the uniaxial compressive strength and the strain rate can be described by a log function. In addition, the higher temperature is, the smaller the extent is, in which the strain rate governs the uniaxial compressive strength; the uniaxial compressive strength decreases with raising temperature and the decline's rate gradually decreases with raising water content. With increasing water content, the uniaxial compressive strength begins to increase nonlinearly, and finally approaches to that of strength of remolded ice, which is different from the early research and results in a doubt on the correctness of the method of specimen preparation by means of adding ice particles to guarantee high ice/water content of specimen.

Key words: frozen soil with high ice/water content, uniaxial compressive strength, strain rate, temperature, water content

中图分类号:

P642.14

杜海民, 张淑娟, 马巍. 高含冰(水)量冻土的单轴抗压强度变化特性研究[J]. 冰川冻土, 2014, 36(5): 1213-1219.

DU Haimin, ZHANG Shujuan, MA Wei. Study of the uniaxial compressive strength characteristics of frozen soil with high ice/water content[J]. JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY, 2014, 36(5): 1213-1219.

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高含冰(水)量冻土的单轴抗压强度变化特性研究

Study of the uniaxial compressive strength characteristics of frozen soil with high ice/water content

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