| 应力主轴往返旋转条件下砂土变形规律试验研究 |
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| 引用本文： | 刘超,张建民.应力主轴往返旋转条件下砂土变形规律试验研究[J].西北地震学报,2017,39(1):28-31. |
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| 作者姓名： | 刘超 张建民 |
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| 作者单位： | 水电水利规划设计总院, 北京 100120,清华大学水沙科学与水利水电工程国家重点实验室, 北京 100084 |
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| 基金项目： | 国家自然科学基金项目（51678346）;水沙科学与水利水电工程国家重点实验室项目（2014-KY-03,2015-KY-03） |
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| 摘 要： | 在已有空心圆柱扭剪仪上开发新的控制模块,实现应力主轴以任意初始方向角开始并以任意角度幅值进行往返旋转。在此基础上,对丰浦砂开展系列应力主轴往返旋转试验。试验结果表明:1应力主轴往返旋转角度幅值和初始主应力方向角均对砂土变形有不可忽视的影响;2不同于应力主轴连续循环旋转的情形,应力主轴往返旋转时砂土由于"楔入效应"可能出现体胀。
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| 关 键 词： | 空心圆柱扭剪仪 应力主轴旋转 砂土 体积变形 试验 |
| 收稿时间： | 2016/1/4 0:00:00 |
Experimental Research on the Deformation of Sand under Principal Stress Back-and-forth Rotation |
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| LIU Chao and ZHANG Jian-min.Experimental Research on the Deformation of Sand under Principal Stress Back-and-forth Rotation[J].Northwestern Seismological Journal,2017,39(1):28-31. |
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| Authors: | LIU Chao and ZHANG Jian-min |
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| Institution: | China Renewable Energy Engineering Institute, Beijing 100120, China and The State Key Laboratory of Science on Water and Sand and Hydropower Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | This paper develops a new control module for a hollow cylinder apparatus (HCA), which allows principal stress to rotate back-and-forth at any angle. A series of experiments on Toyoura sand are conducted. The results indicate that the effects of both the amplitude of the rotation angle and the initial direction of the principle stress on the deformation of sand should not be ignored. Furthermore, sand may expand when principal stress rotates back-and-forth due to the "wedging effect". However, this will not happen when principal stress rotates continuously. |
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| Keywords: | hollow cylinder apparatus principal stress rotation sand volume deformation experiment |
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