重塑上海软土的压缩特性试验

上海大学学报(自然科学版) ›› 2009, Vol. 15 ›› Issue (1): 99-104.

重塑上海软土的压缩特性试验

周科,孙德安

上海大学土木工程系，上海 200072

收稿日期:2007-10-08 出版日期:2009-02-21 发布日期:2009-02-21
通讯作者: 孙德安(1962～)，男，教授，博士生导师,博士,研究方向为非饱和土力学和土的本构模型. E-mail:sundean06@163.com
作者简介:孙德安(1962～)，男，教授，博士生导师,博士,研究方向为非饱和土力学和土的本构模型.
基金资助:
上海市教委基金资助项目(06AZ106)

Experiments on Compression Characteristics of Remoulded Soft Clay in Shanghai

Department of Civil Engineering, Shanghai University, Shanghai 200072, China

Received:2007-10-08 Online:2009-02-21 Published:2009-02-21

摘要/Abstract

摘要：

对上海第4层淤泥质软土重塑试样，进行等向压缩试验、K0试验及单向压缩试验.分析不同试验条件下压缩指数和膨胀指数的关系，给出不同试验条件下压缩指数Cc的大小.对8次等向压缩回弹试验结果进行了分析，比较了膨胀指数Cs的大小.通过对2次K0试验结果的分析，给出重塑上海软土在加载—卸载—再加载过程中，K0随σv的变化规律及K0与OCR(超固结比)的关系.讨论在3种不同试验条件下，卸载过程中膨胀指数Cs与OCR的关系.通过室内试验对压缩性参数的确定，为进一步建立重塑上海软土的本构模型提供了基础.

关键词: 重塑上海软土; 等向压缩试验; K0试验; 压缩指数; 膨胀指数; 超固结比

Abstract:

Differences in compression index (Cc) and swelling index (Cs) of remoulded soft clay in Shanghai measured by different test methods are studied. The tests include isotropic compression test, K0 test and one-dimensional compression test. Differences in compression index are compared based on the results of three isotropic compression tests, two K0 tests, and three one-dimensional compression tests. And differences in swelling index are also compared based on the results of one-dimensional compression tests and isotropic compression-unloading-and-reloading tests. Variation in K0 due to the change of σv is identified from K0 tests, and the relationship between K0 and over consolidation ratio (OCR) is also given. The relationship between Cs and OCR is studied using the results of the three different kinds of tests. Results of these tests are a basis of construction of constitutive models of remoulded soft clay in Shanghai.

Key words: remoulded soft clay in Shanghai; isotropic compression tests; K0 test; compression index; swelling index; over consolidation ratio

中图分类号:

TU 411.5

周科,孙德安. 重塑上海软土的压缩特性试验[J]. 上海大学学报(自然科学版), 2009, 15(1): 99-104.

ZHOU Ke,SUN De-an. Experiments on Compression Characteristics of Remoulded Soft Clay in Shanghai[J]. Journal of Shanghai University（Natural Science Edition）, 2009, 15(1): 99-104.