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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第12卷    第5期    总第68期    2015年10月

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文章编号:1672-7029(2015)05-1047-05
非饱和地基土蠕变特性试验研究
李晓宁1,2,冯君1,巫锡勇1,朱宝龙2

(1.西南交通大学地质工程系,四川成都 610031;
2.西南科技大学土木工程与建筑学院,四川绵阳 621010
)

摘 要: 针对合肥肥东地区非饱和地基土,利用非饱和土固结仪进行控制基质吸力和初始含水率的蠕变试验。研究结果表明:不同基质吸力条件下,非饱和土的变形随时间的变化大致可以分为2个阶段,同时基质吸力的存在对土体具有一定的硬化作用;含水率的增加会同时引起回弹变形和压缩变形,对于研究区的非饱和地基土,其回弹变形大于压缩变形;在不同初始含水率和不同竖向应力作用下,研究区非饱和地基土的蠕变变性特性很小,且24 h等时线都可以近似用3个直线段表达。

 

关键字: 非饱和土;地基;蠕变;基质吸力;初始含水率

Experimental study on the creep characteristics of unsaturated foundation soil
LI Xiaoning12, FENG Jun1, WU Xiyong1, ZHU Baolong2

1. Department of Geological Engineering,Southwest Jiaotong University, Chengdu 610031, China;
2. School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang621010,China

Abstract:The creep tests were conducted by using the unsaturated soil consolidation apparatus in the consideration of matric suction and initial water content for the unsaturated foundation soil in Feidong area of Hefei region. The results show that the curve between deformation and time can be divided into two stages under the control of matric suction, and the matric suction has certain hardening effect for unsaturated soil. For the studied soil, the increase of water content may leads to the spring back deformation and compression deformation, and the spring back deformation is greater than the compression deformation. The creep degeneration characteristic of unsaturated soil in the study area is small, and the 24 h isochron can be approximately expressed in three straight segment with different initial water content and vertical stress.

 

Key words: unsaturated soil; foundation; creep; matric suction; initial water content

ISSN 1672-7029
CN 43-1423/U

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