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冰川冻土 ›› 2013, Vol. 35 ›› Issue (2): 376-382.doi: 10.7522/j.issn.1000-0240.2013.0045

• 寒区科学与技术 • 上一篇    下一篇

冻融循环对黄土二次湿陷特性的影响研究

王泉1,2, 马巍1, 张泽1, 赵淑萍1, 李国玉1, 毛云程1,3   

  1. 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;
    2. 中国科学院大学, 北京 100049;
    3. 甘肃省交通科学研究院有限公司, 甘肃 兰州 730050
  • 收稿日期:2013-01-28 修回日期:2013-03-12 出版日期:2013-04-25 发布日期:2013-05-14
  • 通讯作者: 马巍,E-mail:mawei@lzb.ac.cn E-mail:mawei@lzb.ac.cn
  • 作者简介:王泉(1987-), 男, 辽宁大连人, 2010年毕业于吉林大学, 现为中国科学院寒区旱区环境与工程研究所在读硕士研究生, 主要从事冻融循环与黄土湿陷研究. E-mail: hurryup189@126.com
  • 基金资助:

    国家自然科学基金创新群体项目(41121061); 国家重点基础研究发展计划(973计划)项目(2012CB026106); 国家自然科学基金优秀国家重点实验室研究项目(41023003)资助

Research on the Secondary Collapse Properties of Loessunder Freeze-Thaw Cycle

WANG Quan1,2, MA Wei1, ZHANG Ze1, ZHAO Shu-ping1, LI Guo-yu1, MAO Yun-cheng1,3   

  1. 1. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou Gansu 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Gansu Provincial Communications Science Research Institute Co., Ltd, Lanzhou Gansu 730050, China
  • Received:2013-01-28 Revised:2013-03-12 Online:2013-04-25 Published:2013-05-14

摘要:

在黄土地区公路路基建设中, 通常会采用预湿陷等办法来对湿陷性黄土进行处理以达到工程要求.但是在季节冻土区, 处理过的黄土路基却在运营几年后, 仍发生大量的不均匀沉降、 塌陷等病害.为分析冻融循环作用对黄土二次湿陷的影响, 采用室内试验方法, 使大体积黄土样品先完成一次湿陷, 再进行冻融循环和黄土二次湿陷.试验结果表明: 重塑黄土与原状黄土的二次湿陷系数随着冻融循环次数的增加趋向于同一个特定值; 重塑黄土和原状黄土的二次湿陷系数皆大于0.015, 说明二者皆满足湿陷条件, 在冻融条件下具有二次湿陷性.

关键词: 冻融循环, 原状黄土, 二次湿陷, 黄土路基

Abstract:

In the construction of subgrade in loess areas, some methods like pre-collapse are always taken to make the subgrade more stable. However, in seasonal frozen soil areas, there are some loess subgrades having disease, such as vast uneven settlement or collapse, after running a few years. In order to study and analyze the reason how the freeze-thaw cycle influence the secondary collapse of loess, experiments were done in the laboratory. First, loess specimen was collapsed in a big volume, and then the specimen experienced freeze-thaw cycles and finally experienced second collapse. It is found from these experiments that the intact loess and the remolded loess's coefficients of secondary collapse come to a same value gradually with freeze-thaw cycle increasing; both the intact loess and the remolded loess's coefficients of secondary collapsibility are larger than 0.015, which is the standard to identify whether the loess has the ability to collapse, so both the intact loess and the remolded loess have the ability of secondary collapse under freeze-thaw cycle.

Key words: freeze-thaw cycle, intact loess, secondary collapse, loess subgrade

中图分类号: 

  • P642.14