| 应力、应变控制下压实黄土动力特性研究 |
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| 引用本文： | 胡志平,王强,张雨禾,魏雪妮,王瑞.应力、应变控制下压实黄土动力特性研究[J].西北地震学报,2018,40(6):1161-1167. |
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| 作者姓名： | 胡志平 王强 张雨禾 魏雪妮 王瑞 |
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| 作者单位： | 长安大学建筑工程学院, 陕西 西安 710061;长安大学地下结构与工程研究所, 陕西 西安 710061,长安大学建筑工程学院, 陕西 西安 710061,长安大学建筑工程学院, 陕西 西安 710061,长安大学建筑工程学院, 陕西 西安 710061,长安大学建筑工程学院, 陕西 西安 710061 |
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| 基金项目： | 中铁西安勘察设计研究院有限责任公司科技开发项目（KJ2016-02）；陕西省重点研发计划项目（2017ZDXM-SF-095）；陕西省住房城乡建设科技科研开发项目（2016-K72）；中央高校基本科研业务费专项资金——长安大学优秀博士学位论文培育资助项目（300102288708） |
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| 摘 要： | 基于动三轴试验研究了不同围压条件下,加载控制方式对压实黄土动应力应变关系的影响规律,对比了不同控制方式下压实黄土的动应力应变时程曲线的差异。研究表明:压实黄土的动应力应变关系符合双曲线模型;加载控制方式不会改变压实黄土骨干曲线的类型,但会显著影响拟合参数的大小。相同围压下,采用应变控制测定的初始动模量较小;随着围压的增大,应变控制下初始动模量随围压的增长速率反而越小,二者之间的差距越来越大。应力控制和应变控制加载过程中,动模量在某一振级下随着动循环次数的增加而逐渐衰减,且应力控制方式下衰减的幅度较大。对于土体结构受力较为敏感的原状土,使用应变控制加载方式可能会获得更为准确的试验结果。
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| 关 键 词： | 动三轴试验 应力控制 应变控制 骨干曲线 累积应变 |
| 收稿时间： | 2018/8/20 0:00:00 |
Dynamic Characteristics of Compacted Loess under Controlled-stress and Controlled-strain Modes |
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| HU Zhiping,WANG Qiang,ZHANG Yuhe,WEI Xueni and WANG Rui.Dynamic Characteristics of Compacted Loess under Controlled-stress and Controlled-strain Modes[J].Northwestern Seismological Journal,2018,40(6):1161-1167. |
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| Authors: | HU Zhiping WANG Qiang ZHANG Yuhe WEI Xueni and WANG Rui |
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| Institution: | School of Civil Engineering, Chang''an University, Xi''an 710061, Shaanxi, China;Institute of Underground Structure and Engineering, Chang''an University, Xi''an 710061, Shaanxi, China,School of Civil Engineering, Chang''an University, Xi''an 710061, Shaanxi, China,School of Civil Engineering, Chang''an University, Xi''an 710061, Shaanxi, China,School of Civil Engineering, Chang''an University, Xi''an 710061, Shaanxi, China and School of Civil Engineering, Chang''an University, Xi''an 710061, Shaanxi, China |
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| Abstract: | In this study, we performed dynamic triaxial tests to investigate the effect of loading control mode on the dynamic stress-strain relationship of compacted loess at different confining pressures. We also compared the time-history differences between the dynamic stresses and strains of samples under controlled-stress and controlled-strain modes. The results indicate that the dynamic stress-strain relationship in compacted loess accords with that of the hyperbolic model and that the control mode does not change the type of backbone curve of the compacted loess, but significantly affects the fitting parameters. At the same confining pressure, the initial dynamic modulus obtained by strain-control is smaller than that obtained by stress-control. The growth rate of the initial dynamic modulus obtained by strain-control is relatively small and the gap between the two modes increases with increases in the confining pressure. In the process of stress-control and strain-control loading, the dynamic modulus decreases with increases in the loading cycles at a certain load, and the attenuation amplitude is greater under the stress-control mode than under the strain-control mode. For undisturbed soil with a more sensitive soil structure, more accurate test results can be obtained using the strain-control mode. |
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| Keywords: | dynamic triaxial test stress control strain control backbone curve accumulated strain |
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