| 人造多晶冰三轴压缩强度特性试验研究 |
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| 引用本文： | 徐洪宇,赖远明,喻文兵,徐湘田,常小晓.人造多晶冰三轴压缩强度特性试验研究[J].冰川冻土,2011,33(5):1120-1126. |
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| 作者姓名： | 徐洪宇 赖远明 喻文兵 徐湘田 常小晓 |
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| 作者单位： | 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： | 国家自然科学基金项目(40821001;40730736); 冻土工程国家重点实验室自主项目(SKLFSE-ZY-03); London Mining Greenland科技项目(5424040)资助 |
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| 摘 要： | 为研究冰的三轴强度特性,对人造宏观各向同性冰进行了不同温度和不同围压下的恒定加载速率三轴压缩试验,得到多晶冰三轴压缩的应力-应变曲线、抗压强度与温度之间的关系,利用莫尔-库仑强度准则分析了温度和围压对强度参数的影响.结果表明：轴向应变加载速率为1.67×10-4 s-1时,不同温度、不同围压下冰的应力-应变曲线均为应变...
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| 关 键 词： | 多晶冰 应力-应变曲线 三轴压缩 抗压强度 |
Experimental Research on Triaxial Strength of Polycrystalline Ice |
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| XU Hong-yu,LAI Yuan-ming,YU Wen-bing,XU Xiang-tian,CHANG Xiao-xiao.Experimental Research on Triaxial Strength of Polycrystalline Ice[J].Journal of Glaciology and Geocryology,2011,33(5):1120-1126. |
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| Authors: | XU Hong-yu LAI Yuan-ming YU Wen-bing XU Xiang-tian CHANG Xiao-xiao |
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| Institution: | XU Hong-yu,LAI Yuan-ming,YU Wen-bing,XU Xiang-tian,CHANG Xiao-xiao (State Key Laboratory of Frozen Soil Engineering,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou Gansu730000,China) |
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| Abstract: | Constant-strain rate triaxial compression tests have been carried out on granular freshwater ice,at five confining pressures in the range of 0.5～2.5 MPa and four temperatures in the range of-2.0 to-15.0 ℃,in order to study the strength characteristics of ice under different confining pressures.The stress-strain curves and relationship between compressive strength and temperature are obtained.The influences of temperature and confining stress on strength characteristics are revealed through using Mohr-Coulomb criterion.The results indicate that the stress-strain curves all manifest the property of strain softening under the strain-rate of 1.67×10-4s-1 with different temperatures and confining pressures,and the maximum elastic strain is no more than 1.6%.The cohesive strength changes with temperature in the range of 1.863 to 1.998 MPa.However,in the range of test temperatures,the compressive strength increases linearly with the decrease of temperature when the confining pressure is constant.When temperature is higher than-4.0 ℃,confining pressures have little influence on the slip resistance as a result of the internal frictional angle near zero.At the temperatures of-7.0 ℃ and-15.0 ℃,the compressive strength increases with the increase of confining pressure and the internal frictional angle increases from 9.54 to 15.4.There is an approximate linear relation between confining pressure and shearing resistance,when the confining pressure is lower than 2.0 MPa,but the relation will be nonlinear when the pressure becomes more. |
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| Keywords: | polycrystalline ice stress-strain curve triaxial compression compressive strength |
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