[1]杨更社,田俊峰,叶万军.冻融循环对阳曲隧道黄土细观损伤演化规律影响研究[J].西安科技大学学报,2014,(06):635-640.[doi:10.13800/j.cnki.xakjdxxb.2014.0601]
 YANG Geng-she,TIAN Jun-feng,YE Wan-jun.Influence of freeze-thaw cycles on Yangqu tunnel loess meso-damage evolution[J].Journal of Xi'an University of Science and Technology,2014,(06):635-640.[doi:10.13800/j.cnki.xakjdxxb.2014.0601]
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冻融循环对阳曲隧道黄土细观损伤演化规律影响研究(/HTML)
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西安科技大学学报[ISSN:1672-9315/CN:61-1434/N]

卷:
期数:
2014年06期
页码:
635-640
栏目:
出版日期:
2014-12-08

文章信息/Info

Title:
Influence of freeze-thaw cycles on Yangqu tunnel loess meso-damage evolution
文章编号:
1672-9315(2014)06-0635-06
作者:
杨更社田俊峰叶万军
西安科技大学 建筑与土木工程学院,陕西 西安 710054
Author(s):
YANG Geng-sheTIAN Jun-fengYE Wan-jun
College of Architecture and Civil Engineering,Xi'an University of Science And Technology,Xi'an 710054,China
关键词:
黄土 冻融循环 细观损伤 演化规律
Keywords:
loess freeze-thaw cycle meso damage evolution law
分类号:
P 642.14
DOI:
10.13800/j.cnki.xakjdxxb.2014.0601
文献标志码:
A
摘要:
为了研究冻融环境对黄土工程特性的影响,对山西阳曲1号黄土隧道施工过程进行了监测,可知冻融循环会通过对土中水的作用改变黄土特性,从而导致黄土工程特性的改变。以山西阳曲1号黄土隧道掌子面黄土为研究对象,运用损伤力学的研究方法,对土样进行了冻融循环后的CT扫描试验并分析,结果表明:冻融循环会造成土样原孔隙扩展、伸长、分叉、贯通; 冻融循环对试件的破坏作用与初始孔隙分布密切相关; 冻结过程发生水分向低温端(由内向外)迁移,土样发生明显的冻胀密减现象; 随着冻融循环次数的增加,黄土CT数均值减少,方差增大,当15次冻融循环后,CT数均值趋于平缓。总体上来看,土样ME随冻融循环次数的增加而降低,SD随冻融循环次数的增加而增加。
Abstract:
In order to study the influence of freeze-thaw environment on the engineering properties of loess,mointoring the Shanxi Yanqu No.1 loess tunnel construction process,knowthe freeze-thaw cycle will change the loess characteristics through effects on soil water,thus leading to changes in the engineering properties.Taking the Loess of Shanxi Yangqu No.1 tunnel face as the research object,using damage mechanics research methods,the soil wastested and analyzedunder the freeze-thaw cycle after CT scanning.The results show that:the freeze-thaw cycle can cause the soil pore expansion,the original elongation,bifurcation,through; freeze-thaw damage to the specimen is closely related to the distribution of initial pore; during the freezing process of water to lower temperature side(from the inside to the outside)migration,soil frost density decrease obviously; with the increase of freeze-thaw cycles,the mean CT value decreased,the variance increases,after 15 cycles of freezing and thawing,mean CT value tends to be smooth.On the whole,soil ME decrease with the freeze-thaw cycle increase,SD increase with theincreasenumber of freeze-thaw cycling.

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备注/Memo

备注/Memo:
收稿日期:2014-09-10 责任编辑:李克永
基金项目:国家自然科学基金(41272340,41172262); 教育部新世纪人才支持计划项目(NCEF-12-1044); 陕西省青年科技新星项目(KJXX-37); 陕西省重点科技创新团队计划(2014KCT-30)
通讯作者:杨更社(1962-),男,陕西咸阳人,教授,博士生导师,E-mail:yanggs@xust.edu.cn
更新日期/Last Update: 2014-12-01