[1]胡秀青,王欢,符洪涛,等.椭圆应力路径下双向非等幅剪切对软黏土动力特性的影响[J].东南大学学报(自然科学版),2019,49(3):433-439.[doi:10.3969/j.issn.1001-0505.2019.03.004]
 Hu Xiuqing,Wang Huan,Fu Hongtao,et al.Effects of bi-directional unconstant amplitude shear stress on dynamic properties of soft clay in under ellipse stress path[J].Journal of Southeast University (Natural Science Edition),2019,49(3):433-439.[doi:10.3969/j.issn.1001-0505.2019.03.004]
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椭圆应力路径下双向非等幅剪切对软黏土动力特性的影响()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
49
期数:
2019年第3期
页码:
433-439
栏目:
土木工程
出版日期:
2019-05-20

文章信息/Info

Title:
Effects of bi-directional unconstant amplitude shear stress on dynamic properties of soft clay in under ellipse stress path
作者:
胡秀青12王欢12符洪涛12刘飞禹3陈琳3王军12
1温州大学建筑工程学院, 温州 325035; 2温州大学浙江省软弱土地基与海涂围垦工程技术重点实验室, 温州 325035; 3上海大学土木工程系, 上海 200072
Author(s):
Hu Xiuqing12 Wang Huan12 Fu Hongtao12 Liu Feiyu3 Chen Lin3 Wang Jun12
1School of Architecture and Engineering, Wenzhou University, Wenzhou 325035, China
2Key Laboratory of Engineering and Technology for Soft Soil Foundation and Tideland Reclamation of Zhejiang Province, Wenzhou University, Wenzhou 325035, China
3 Department of Civil Engineering, Shanghai University, Shanghai 200072, China
关键词:
动单剪 双向剪切应力比 软化指数 动应变 孔压
Keywords:
dynamic simple shear bi-directional shear stress ratio softening index dynamic strain pore pressure
分类号:
TU447
DOI:
10.3969/j.issn.1001-0505.2019.03.004
摘要:
针对地震产生的S波引起土体水平剪切振动问题,以温州软黏土为研究对象,采用多向循环单剪仪进行了12组应力控制下的不排水循环单剪试验,研究了水平双向耦合荷载作用下循环应力比β和双向剪切应力比η对饱和软黏土动力特性的影响.通过对试验数据回归分析,建立了软黏土的软化指数模型.试验结果表明:软黏土动强度与η呈近似线性增长关系.β一定时,η越小,土体产生的剪应变和孔压越大.当β=0.14时,剪应变、孔压发展缓慢,呈稳定型增长,η对软化指数、剪应变和孔压的影响不大;当β≥0.20时,剪应变、孔压发展迅速,呈破坏型增长,η的减小明显加快了剪应变、孔压的发展及软化指数的衰减,从而使软黏土更容易发生软化.
Abstract:
Aiming at the problem of horizontal shear vibration caused by S-wave in earthquake, 12 groups of stress controlled undrained cyclic simple shear tests were carried out using multi-directional cyclic simple shear apparatus by taking Wenzhou soft clay as the research object. The effects of the cyclic stress ratio β and the bi-directional shear stress ratio η on the dynamic properties of saturated soft clay under horizontal bi-directional coupled loads were investigated. The softening index model of soft clay was established through analysis of data regression. The test results show that the relationship between the dynamic strength of soft clay and η is nearly linear.When β is constant, the smaller η, the greater the shear strain of soil and the pore pressure. When β =0.14, the strain and the pore pressure develop slowly and exhibit a stable growth, and the change of η has little effect on the strain, the pore pressure and the softening index. When β≥0.20, the shear strain and the pore pressure develop rapidly and exhibit a destructive growth, and the decrease of η accelerates the development of the shear strain and the pore pressure and the attenuation of the softening index, making soft clay more vulnerable to softening.

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备注/Memo

备注/Memo:
收稿日期: 2018-11-25.
作者简介: 胡秀青(1982—),女,博士,副教授, 00151052@wzu.edu.cn.
收稿日期: 国家自然科学基金资助项目(51478364,51622810,51778500).
引用本文: 胡秀青,王欢,符洪涛,等.椭圆应力路径下双向非等幅剪切对软黏土动力特性的影响[J].东南大学学报(自然科学版),2019,49(3):433-439. DOI:10.3969/j.issn.1001-0505.2019.03.004.
更新日期/Last Update: 2019-05-20