| 不等幅值循环荷载下冻土残余应变研究及其CT分析 |
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| 引用本文： | 徐春华,徐学燕,沈晓东.不等幅值循环荷载下冻土残余应变研究及其CT分析[J].岩土力学,2005,26(4):572-576. |
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| 作者姓名： | 徐春华 徐学燕 沈晓东 |
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| 作者单位： | 1. 哈尔滨工业大学,土木工程学院,哈尔滨,150090
2. 哈尔滨工业大学,土木工程学院,哈尔滨,150090;中国科学院兰州寒区旱区环境与工程研究所,冻土工程国家重点实验室,兰州,730000 |
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| 基金项目： | 国家自然科学基金资助项目(No.40071021)，中国科学院冻土工程国家重点实验室基金资助项目 |
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| 摘 要： | 基于不等幅值循环荷载作用下低温三轴振动试验资料,研究了冻结粉质粘土在分级往返加荷情况下的残余应变产生条件。根据冻土的残余应变与其温度、振次、含水量等因素的关系曲线,得到了随着温度的降低残余应变值减小、随着振动次数的增加残余应变值增大;含水量的变化对其影响很小的结论。根据冻土试样震融沉前后CT测试数据及扫描图像,定量地分析了土样结构微裂纹发展、密度变化规律,并对冻土特有的震融沉形成机理给予解释。
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| 关 键 词： | 冻土 残余应变产生条件 结构微裂纹 震融沉 |
| 文章编号： | 1000-7598-(2005)04-0572-05 |
| 收稿时间： | 2003-12-12 |
| 修稿时间： | 2003年12月12 |
Study on residual strain of frozen soil and CT analysis under cyclic loading of variable amplitudes |
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| XU Chun-hua,XU Xue-yan,SHEN Xiao-dong.Study on residual strain of frozen soil and CT analysis under cyclic loading of variable amplitudes[J].Rock and Soil Mechanics,2005,26(4):572-576. |
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| Authors: | XU Chun-hua XU Xue-yan SHEN Xiao-dong |
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| Institution: | 1. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China; 2.State Key Laboratory of Frozen Soil Engineering, CAREERI, CAS, Lanzhou 730000, China |
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| Abstract: | By means of the experimental data from dynamic triaxial stress-strain test of variable cyclic amplitude for frozen soil, the formative conditions of residual strain on frozen silt clay are studied. It is concluded that the residual strain of frozen soil decreases as the temperature falls, increases with the vibratory times at the same temperature level; and the change of water content has a little effect on it, through the relationships of residual strain versus temperature, vibratory time and water content. The variation laws of structural hair cracking and the characteristics of density for frozen soils are analyzed quantitatively based on the CT scanning results of frozen silt clay before and after dynamic triaxial test. And the formation mechanism of seismic-thaw-settlement of frozen soils is interpreted. |
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| Keywords: | frozen soil formation conditions of residual strain structural hair cracking seismic thaw settlement |
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