| 高含冰量冻土动强度和残余应变的试验研究 |
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| 引用本文： | 高志华,石坚,张淑娟,罗丽娟.高含冰量冻土动强度和残余应变的试验研究[J].冰川冻土,2009,31(6):1143-1149. |
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| 作者姓名： | 高志华 石坚 张淑娟 罗丽娟 |
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| 作者单位： | 长安大学,建筑工程学院,陕西,西安,710061;中国科学院,寒区旱区环境与工程研究所,冻土工程国家重点实验室,甘肃,兰州,730000 |
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| 基金项目： | 国家自然科学基金重点项目，中国科学院知识创新工程重大项目 |
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| 摘 要： | 冻土对温度敏感且性质易变, 而高含冰量冻土的性质更是极不稳定, 针对不同温度、 不同围压下50%的高含冰量重塑冻土进行了动三轴试验.结果表明: 动强度随着振次的增大线性减小, 和温度呈二次变化关系, 随着负温的增大而增大, 围压对动强度影响不大;残余轴应变随着振次的增大而增大, 呈幂函数的关系;随负温的增大而变小, 围压对残余应变影响也不大. 根据这些影响因素, 分别给出了高含冰量冻土的动强度和残余应变的计算公式, 这些结果可为该类土的动力特性研究提供参考.
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| 关 键 词： | 高含冰量冻土 动三轴试验 动强度 残余应变 |
Experimental Study of the Dynamic Strength Characteristics and Rresidual Strain of Ice-Rich Frozen Soil |
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| GAO Zhi-hua,SHI Jian,ZHANG Shu-juan,LUO Li-juan.Experimental Study of the Dynamic Strength Characteristics and Rresidual Strain of Ice-Rich Frozen Soil[J].Journal of Glaciology and Geocryology,2009,31(6):1143-1149. |
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| Authors: | GAO Zhi-hua SHI Jian ZHANG Shu-juan LUO Li-juan |
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| Abstract: | Permafrost is very unstable in mechanical properties owing to its sensitivity to temperature, especially for the ice-rich frozen soil. Dynamic triaxial tests are carried out on frozen clay sampled from the Qinghai-Tibet Railway, under different temperatures and different confining pressures. It is found that dynamic strength linearly decreases with the increase in logarithmic cyclic number, while increases with the decreasing temperature in a square relationship;Residual axial strain increases with increasing of cyclic number in a power function relationship and it decreases with decrease of temperature. Moreover, the dynamic strength and residual axial strain are not obviously influenced by the confining pressure. Based on the influential factors, the dynamic strength and residual axial strain calculation formula for ice-rich frozen soil are obtained, which are useful in practice. |
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| Keywords: | ice-rich frozen soil dynamic triaxial test dynamic strength residual strain |
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