列车荷载引起心形应力路径下软土非共轴应变特征研究

doi:10.16285/j.rsm.2017.01.001

›› 2017, Vol. 38 ›› Issue (1): 1-9.doi: 10.16285/j.rsm.2017.01.001

• 基础理论与实验研究 • 下一篇

列车荷载引起心形应力路径下软土非共轴应变特征研究

沈扬^{1, 2}，徐海东^{1, 2}，王保光^{1, 2}，刘汉龙^{1, 3}

1. 河海大学岩土力学与堤坝工程教育部重点实验室，江苏南京 210098；2. 河海大学江苏省岩土工程技术工程研究中心，江苏南京 210098；3. 重庆大学土木工程学院，重庆 400044

收稿日期:2016-04-13 出版日期:2017-01-11 发布日期:2018-06-05
作者简介:沈扬，男，1980年生，博士，教授，博士生导师，主要从事土体静动力学特性和本构理论方面的研究工作。
基金资助:
国家自然科学基金面上项目(No. 51479060)；中央高校基本科研业务费专项资金项目(No. 2015B28214)。

Strain characteristics of non-coaxiality under heart- shaped stress path caused by train loads in soft clay

SHEN Yang^{1, 2}, XU Hai-dong^{1, 2}, WANG Bao-guang^{1, 2}, LIU Han-long^{1, 3}

1. Key Laboratory of Geomechanics and Embankment Engineering of Ministry of Education, Hohai University, Nanjing, Jiangsu 210098, China; 2. Jiangsu Research Center for Geotechnical Engineering Technology, Hohai University, Nanjing, Jiangsu 210098, China; 3. College of Civil Engineering, Chongqing University, Chongqing 400044, China

Received:2016-04-13 Online:2017-01-11 Published:2018-06-05
Supported by:
This work was supported by the National Natural Science Foundation of China (51479060) and the Fundamental Research Funds for the Central Universities (2015B28214).

摘要/Abstract

摘要： 采用空心圆柱仪对重塑空心软黏土试样开展了一系列非破坏试验，研究了列车循环动荷载作用下的性状。试验中主要选取心形应力路径，以圆形应力路径为辅助，对比分析了两种应力路径下软土的非共轴应变特征，探究循环振次对非共轴特性的影响、荷载频率的大小对非共轴角与大主应力方向角关系曲线形态变化的影响，同时进行了机制分析，并与另一动应力水平下试验结果进行了对比论证。此外，在不考虑频率影响下建立了简化的非共轴角与大主应力方向角之间的关系模型。研究发现，在大主应力方向角旋转的任意周期内，心形与圆形两种应力路径下非共轴角随大主应力方向角变化趋势各自有明显特点，相同动应力水平下两种应力路径产生的偏应力增量引起的单位偏应变增量大小也有所区别，但在大主应力方向角旋转的局部角度内，两种应力路径下的偏应变增量相近；心形应力路径下的非共轴角以及偏应力增量引发的单位偏应变增量大小受循环振次的影响不明显，任意振次中大主应力方向角在[-30°，40°]弧度区间内对应的偏应变增量远大于该区间之外的偏应变增量；随着频率增大，非共轴角随大主应力方向角的变化呈现越来越明显的波动。

关键词: 列车荷载, 非共轴, 循环振次, 频率

Abstract: To study the behavior of soft clay under cyclic train loads, a series of non-destructive tests on remolding hollow cylinder samples is conducted using hollow cylindrical apparatus. Most of the tests are in the heart-shaped stress path and some are in the round stress path as assistant. The strain characteristics of non-coaxiality under the two kinds of stress path are compared with each other. The effects of vibration cycle times N on non-coaxiality and the influence of frequency f on the shape of curves between non-coaxial angle ? and major principal stress directional angle ?? are studied. The analysis of mechanism is carried out and the test results under the other dynamic stress level are compared with the former tests. In addition, a simplified model of relation between ? and ?? taking no account of f is established. The research shows that during any cycle of ?? , the relations between ? and ?? under the two stress paths have their own characteristics. And unit deviator strain increments caused by deviator stress increments (d? /ds) under the two stress paths at the same dynamic stress level are different from each other. However, during some section of ?? , the d?/ ds under the two stress paths are close to each other. The impacts of N on ? and d?/ds under the heart-shaped stress path are slight. d?/ds is much larger in the angle section [30°, 40°] of ?? than the other section during any vibration cycle time. The curves between ? and ?? fluctuate violently with the f increasing.

Key words: train loads, non-coaxial, vibration cycle times, frequency

中图分类号:

TU 435

沈扬，徐海东，王保光，刘汉龙 , . 列车荷载引起心形应力路径下软土非共轴应变特征研究[J]. , 2017, 38(1): 1-9.

SHEN Yang , XU Hai-dong , WANG Bao-guang , LIU Han-long , . Strain characteristics of non-coaxiality under heart- shaped stress path caused by train loads in soft clay[J]. , 2017, 38(1): 1-9.

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列车荷载引起心形应力路径下软土非共轴应变特征研究

Strain characteristics of non-coaxiality under heart- shaped stress path caused by train loads in soft clay

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