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冰川冻土 ›› 2019, Vol. 41 ›› Issue (4): 858-864.doi: 10.7522/j.issn.1000-0240.2019.0056

• 寒区科学与技术 • 上一篇    下一篇

冻融循环对原状过湿土固结变形特性的影响

程培峰, 王佳康   

  1. 东北林业大学 土木工程学院, 黑龙江 哈尔滨 150040
  • 收稿日期:2018-02-12 修回日期:2018-08-18 发布日期:2019-03-16
  • 通讯作者: 王佳康,E-mail:1257182056@qq.com. E-mail:1257182056@qq.com
  • 作者简介:程培峰(1963-),男,辽宁朝阳人,教授,2000年在日本国立爱媛大学获博士学位,从事路基路面结构与道路工程材料、道路环境与安全及交通工程方面的研究.E-mail:chengpeifeng@126.com
  • 基金资助:
    黑龙江省交通运输厅重点项目(43216011)资助

Effect of freezing-thawing cycles on consolidation deformation characteristics of natural over-wet soil

CHENG Peifeng, WANG Jiakang   

  1. College of Civil Engineering, Northeast Forestry University, Harbin 150040, China
  • Received:2018-02-12 Revised:2018-08-18 Published:2019-03-16

摘要: 为了研究季冻区过湿土的固结变形特性,对黑大公路青冈段路基原状过湿土进行固结试验和渗透试验,研究了冻融循环作用下原状过湿土的固结变形特性。试验结果表明:原状过湿土的含水率越高,土体的压缩性越高;初始孔隙比越大,渗透性越高。冻融循环后,过湿土产生不规则裂缝,土的结构也发生改变,土的压缩系数有所增大,随着冻融循环次数的增加,压缩性先增大后趋于平缓。冻融后过湿土的竖向渗透系数明显增大,且随着冻融循环次数的增加渗透性呈现先增大后趋于平缓的规律,而横向渗透系数冻融前后无明显差异。

关键词: 冻融循环, 过湿土, 固结变形, 渗透性

Abstract: In order to study the consolidation and deformation characteristics of over-wet soil in seasonal frozen areas, a consolidation test and a permeability test were carried out by using the natural soil sampled from a wet soil roadbed of the the highway from Lanxi to Qinggang in Heilongjiang Province. The effect of the freezing-thawing cycles on the consolidation and deformation characteristics of the over-wet soil was studied emphatically. The results show that the higher the moisture content of the undisturbed soil, the lower the compressibility of the soil; the higher the initial porosity ratio, the higher the permeability. After freezing-thawing cycles, soil specimen produces irregular cracks, along with soil structure changing and compression coefficient increasing. With increase of freezing-thawing cycles, compression increases gradually and then gently. After freezing-thawing cycles, the vertical permeability coefficient of the wet soil obviously increases. With increase of freezing-thawing cycles, the permeability increases gradually and then gently. There is no obvious difference of the transverse permeability coefficient before and after freezing-thawing.

Key words: freezing-thawing cycles, over-wet soil, consolidation deformation, permeability

中图分类号: 

  • P642.14