欢迎访问现代地质!

现代地质 ›› 2009, Vol. 23 ›› Issue (3): 559-563.

• 工程地质学 • 上一篇    下一篇

非饱和粉质粘土固结压缩特性及体变试验研究

吴丽君1,蒋关鲁1,李安洪2,梁栋1   

  1. 1西南交通大学 土木工程学院,四川 成都610031;2中国中铁二院集团有限责任公司,四川 成都610031
  • 收稿日期:2008-09-27 修回日期:2009-03-09 出版日期:2009-06-20 发布日期:2011-12-21
  • 作者简介:吴丽君,女,博士研究生,1981年出生,道路与铁道工程专业,主要从事非饱和土力学研究。 E-mail:grace_binyu3@163.com。
  • 基金资助:

    西南交通大学博士创新基金项目(20070613044)

Consolidation and Compressibility of Unsaturated Silt Clay and Test Study on Volume Change

WU Li-Jun1,JIANG Guan-Lu1,LI An-Hong2,LIANG Dong1   

  1. 1School of Civil Engineering,Southwest Jiaotong University, Chengdu, Sichuan610031, China;
    2China Railway Eryuan Engineering Group Co Ltd,Chengdu,Sichuan610031, China
  • Received:2008-09-27 Revised:2009-03-09 Online:2009-06-20 Published:2011-12-21

摘要:

为进一步研究与基质吸力相关联的非饱和土固结压缩特性,扩展非饱和土固结理论在工程实际中的适用性,通过分析非饱和粉质粘土水土特征曲线变化规律,对非饱和土固结变形机理进行研究。试验结果表明:非饱和土的最终沉降量仅与土骨架的压缩模量有关。对于不同饱和度的非饱和土而言,固结速度随初始饱和度的增加而减小,饱和土固结过程所需要的时间比非饱和土固结过程所需要的时间短。由于孔隙流体的压缩性导致高饱和土体的瞬时沉降比低饱和土体的瞬时沉降小,但高饱和土体的后期固结沉降受饱和度和吸力的影响,比低饱和土体要大得多。

关键词: 非饱和土, 饱和度, 固结, 压缩性, 基质吸力

Abstract:

For studying consolidation mechanism of unsaturated soil which was correlative with matric suction, and extending the applicability of consolidation theory,consolidation mechanism of unsaturated soil under different saturations was discussed by analyzing the water soil characteristic curve based on the latest experiment results. The results indicated that the ultimate settlement is only related to the module of compression. The consolidation velocity of unsaturated soil is reducing with the initial degree of saturation, and the time of saturated soil achieved complete consolidation is longer than unsaturated soil. The instantaneous settlement of unsaturated soil under high degree is less than that under low degree in virtue of the compression of mixture in soil. Because of saturation and matric suction in consolidation, the consolidation settlement under high degree is more than that under low degree.

Key words: unsaturated soil, degree of saturation, consolidation, compressibility, matric suction

中图分类号: