恒定主应力轴偏转循环荷载下饱和软黏土累积孔压特性分析

吉林大学学报(地球科学版)

恒定主应力轴偏转循环荷载下饱和软黏土累积孔压特性分析

姚兆明^1,2,3,牛连僧¹,徐颖¹,王厚良²,陈军浩¹

1.安徽理工大学土木建筑学院，安徽　淮南232001;
2.中煤矿山建设集团有限责任公司，合肥230000;
3.安徽理工大学冻土研究所,安徽　淮南232001

收稿日期:2013-01-20 出版日期:2013-09-26 发布日期:2013-09-26
作者简介:姚兆明(1975-)，男，副教授，博士,主要从事岩土工程教学与研究工作，E-mail:zhmyaoaust@126.com
基金资助:
安徽高等学校自然科学基金重点项目(KJ2012A072);国家博士后基金项目(2013M531493);住房和城乡建设部项目(2012-R3-12); 安徽省住房和城乡建设厅项目(2012YF-25)

Analysis on Pore Pressure of Saturated Soft Clay Subject to Cyclic Loading Considering Principal Stress Axis Deflection

Yao Zhaoming^1,2,3,Niu Lianseng¹,Xu Ying¹,Wang Houliang²,Chen Junhao¹

1.School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan232001, Anhui,China;
2.China Coal Construction(Group) Corporation LTD,Hefei230000,China;
3.Atificial Frozen Soil Institute, Anhui University of Science and Technology, Huainan232001, Anhui,China

Received:2013-01-20 Online:2013-09-26 Published:2013-09-26

摘要/Abstract

摘要：

现有的饱和软黏土循环荷载累积孔压显式模型未能反映路基土体单元在土体自重作用下主应力轴的偏转现象。在确定饱和软黏土固结时间的基础上，在固结压力分别为100、150、200 kPa下，对软黏土进行主应力轴偏转角为15°、30°、45°的不排水循环加载试验，得到了固结围压、主应力轴旋转角及动应力比对循环累积孔压影响的规律。基于第一次循环加载累积孔压变化规律和修正动偏应力水平，建立了能考虑恒定主应力轴偏转角循环加载下累积孔压显式模型，并利用恒定主应力轴偏转角循环加载试验结果验证了模型的合理性。建立的循环荷载下饱和软黏土累积孔压显式模型参数易于确定,参数具有明确的物理意义且能考虑主应力轴的恒定偏转现象。

关键词: 固结时间, 循环累积孔压, 恒定主应力轴偏转角, 黏土

Abstract:

The traditional accumulative pore pressure model of saturated soft clay under cyclic loading can not reflect the phenomenon of principal stress axial deflection. With the determination of consolidation time, under the condition of 100,150,200 kPa consolidation pressure, the undrained cyclic loading test with the principal stress axes angle of 15°,30°,45° was conducted on soft clay. The effects of confining pressure, the principal stress axis rotation angle and the static deviator stress on cycle cumulative pore pressure were obtained. On the basis of the cumulative pore pressure of the first cyclic loading and the revised dynamic deviatoric stress level, an explicit model was proposed to calculate the cumulative pore pressure of saturated clay subjected to cyclic loading. The validity of the model was verified based on undrained cyclic tests of consolidated soft clay. The parameters were of physical significance and are easy to be obtained. The proposed explicit model could reflect the phenomenon of principal stress axial deflection.

Key words: consolidation time, cyclic accumulative pore pressure, constant principal stress deflection angle, soft clay

中图分类号:

TU473

姚兆明,牛连僧,徐颖,王厚良,陈军浩. 恒定主应力轴偏转循环荷载下饱和软黏土累积孔压特性分析[J]. 吉林大学学报(地球科学版), 2013, 43(5): 1533-1538.

Yao Zhaoming,Niu Lianseng,Xu Ying,Wang Houliang,Chen Junhao. Analysis on Pore Pressure of Saturated Soft Clay Subject to Cyclic Loading Considering Principal Stress Axis Deflection[J]. Journal of Jilin University(Earth Science Edition), 2013, 43(5): 1533-1538.

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