超固结黏土单调和耦合循环的剪切特性研究

›› 2009, Vol. 30 ›› Issue (9): 2616-2622.

超固结黏土单调和耦合循环的剪切特性研究

聂影¹，²，栾茂田¹，唐小微¹，郭莹¹，张振东¹，宋岩新¹，²

1. 大连理工大学土木水利学院岩土工程研究所，大连 116085；2. 中冶赛迪工程技术股份有限公司建筑工程设计部，重庆 400013

收稿日期:2008-05-05 出版日期:2009-09-10 发布日期:2010-03-24
作者简介:聂影，男，1980年生，博士生，主要从事软土工程等方面的试验与理论研究。
基金资助:
国家自然科学基金资助项目（No.50579006、50179006）；国家自然科学基金重点基金资助项目（No.50439010）。

Study of monotonic and coupling cyclic shear characteristics of overconsolidated clay

NIE Ying¹, ², LUAN Mao-tian¹, TANG Xiao-wei¹, GUO Ying¹, ZHANG Zhen-dong¹, SONG Yan-xin¹, ²

1. School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116085, China; 2. Institute of Constructional Engineering, CISDI Engineering Co. Ltd., Chongqing 400013, China

Received:2008-05-05 Online:2009-09-10 Published:2010-03-24

摘要/Abstract

摘要：

针对超固结黏土空心试样，利用土工静力-动力液压三轴-扭转多功能剪切仪，在均等固结条件下进行了单调扭剪和三轴-扭转耦合循环剪切试验。试验结果表明：不同超固结比黏土的单调扭剪强度也可由正常固结黏土的单调扭剪强度得到，得到了不同超固结比下饱和黏土的强度及模量的退化规律；随着超固结比的增大，相同破坏循环次数的动应力比和临界循环应力比均线性增大；超固结比对耦合循环剪切的孔隙水压力的发展模式影响显著。参考Yasuhara的测量方法，采用荷载停止后继续采集孔压的方法可以更好地反映黏土在耦合循环荷载下产生的真实孔压和孔压的增长情况。提出的综合应变式同时考虑了剪切变化和正向偏差变形的共同效应，适合作为主应力连续旋转的耦合循环剪切试验的破坏标准。

关键词: 超固结黏土, 空心试样, 主应力轴旋转, 耦合循环剪切, 破坏标准, 孔压

Abstract:

The apparatus for static and dynamic universal triaxial and torsional shear soil testing was employed to perform stress-controlled coupled vertical and torsional coupling shear tests and monotonic torsional tests under undrained condition. Through a series of tests on saturated clay, monotonic torsional and rotation of principal stress under coupling cyclic shear behavior was examined. The strength of normal consolidated saturated clay in the monotonic torsional tests could be used to evaluate the overconsolidated monotonic torsional strength. The results of coupling tests show that the dynamic stress ratio and critical cyclic stress ratio linearly increased at uniform failure number with the overconsolidation ratio increased. This paper indicates that the effect of development mode of pore water pressure of coupling cyclic shear tests under different overconsolidation ratios is notable. The method of acquiring pore water pressure after ceasing coupling cyclic loading is able to better reflect the variation of water pore pressure with different overconsolidation ratios. It has been observed that a general strain fail criterion for clay is recommended for considering the integrative effects of torsional shear strain and normal deviatoric strain as well as cyclic strain and accumulative strain. Moreover, the general strain fail criterion is fit for the failure criterion of coupling cyclic test.

Key words: overconsolidation clay, hollow sample, rotation of principal stress, coupling cyclic shear, failure criterion, pore water pressure

中图分类号:

TU 443

聂影，栾茂田，唐小微，郭莹，张振东1，宋岩新. 超固结黏土单调和耦合循环的剪切特性研究[J]. , 2009, 30(9): 2616-2622.

NIE Ying, LUAN Mao-tian, TANG Xiao-wei, GUO Ying, ZHANG Zhen-dong. Study of monotonic and coupling cyclic shear characteristics of overconsolidated clay[J]. , 2009, 30(9): 2616-2622.

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