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[1]董金梅,朱华,叶明鸽.应力路径对粉土力学特性的影响试验[J].南京工业大学学报(自然科学版),2019,41(03):376-382.[doi:10.3969/j.issn.1671-7627.2019.03.016]
 DONG Jinmei,ZHU Hua,YE Mingge.Stress path experiments for effect on mechanical properties of silty soil[J].Journal of NANJING TECH UNIVERSITY(NATURAL SCIENCE EDITION),2019,41(03):376-382.[doi:10.3969/j.issn.1671-7627.2019.03.016]
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应力路径对粉土力学特性的影响试验()
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《南京工业大学学报(自然科学版)》[ISSN:1671-7627/CN:32-1670/N]

卷:
41
期数:
2019年03期
页码:
376-382
栏目:
出版日期:
2019-05-28

文章信息/Info

Title:
Stress path experiments for effect on mechanical properties of silty soil
文章编号:
1671-7627(2019)03-0376-07
作者:
董金梅朱华叶明鸽
南京工业大学 交通运输工程学院,江苏 南京 210009
Author(s):
DONG JinmeiZHU HuaYE Mingge
College of Transportation Science & Engineering, Nanjing Tech University, Nanjing 210009,China
关键词:
应力路径 固结不排水试验 粉土 应力应变特性 强度
Keywords:
stress path consolidated-undrained test silty soil stress strain characteristics strength
分类号:
U416.03
DOI:
10.3969/j.issn.1671-7627.2019.03.016
文献标志码:
A
摘要:
应力路径是影响土体强度和变形特性的重要因素,本文利用GDSTAS全自动三轴仪对苏北地区的粉土开展常规三轴压缩、减压三轴压缩、等压压缩3种应力路径的力学特性试验。结果表明:应力路径对粉土应力-应变特性影响显著,常规三轴压缩应力路径下应力-应变特性因围压大小而不同,等压压缩应力路径和减压压缩应力路径下粉土应力-应变特性都为应变软化型,但软化程度不同; 不同应力路径下粉土的应力-应变特性可采用应变软化模型和双曲线模型进行拟合,拟合结果较好; 相同围压下,常规三轴压缩应力路径下粉土强度最大,轴向应变的变化速率最快,等压压缩应力路径粉土强度次之,减压压缩应力路径强度最低,轴向应变的变化速率最慢。研究结果能为工程中不同应力路径下粉土地基设计计算提供较为可靠的力学指标。
Abstract:
The stress path is an important factor affecting soil strength and deformation characteristics. GDSTAS automatic triaxial instrument was used to carry out the mechanical test of three stress paths in Subei area, namely conventional tri-axial compression(CTC), reduced tri-axial pressure compression(RTC)and equal pressure compression(TC). Results showed that the stress path had a significant influence on the stress-strain characteristics of silty soil. Under the conventional tri-axial compression stress path, the stress-strain characteristics differed due to the different confining pressures, while under the equal pressure compression stress path and minus pressure compression stress path, it resembled strain softening type, and only the softening degree was different. The stress-strain characteristics of silt soil under different stress paths could be fitted using the strain softening model and the hyperbolic one, and the results were good. Under the conventional tri-axial compression stress path, the silty soil had the maximum strength and fastest change rate of axial stress strain for keeping same confining pressure, followed by the silty soil under the equal pressure compression stress path, while the silty soil had the lowest strength and change rate in axial stress strain under the minus pressure compression stress path. The results provided reliable mechanical indexes for the design and calculation of silt foundation under different stress paths in engineering.

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备注/Memo

备注/Memo:
收稿日期:2018-09-02
基金项目:国家自然科学基金(51108236)
作者简介:董金梅(1974—),女,副教授,E-mail: djmnj802@163.com.
引用本文:董金梅,朱华,叶明鸽.应力路径对粉土力学特性的影响试验[J].南京工业大学学报(自然科学版),2019,41(3):376-382..
更新日期/Last Update: 2019-05-30