| 冻结和林黄土力学性质的试验研究 |
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| 引用本文： | 徐湘田,王继伟,张明义.冻结和林黄土力学性质的试验研究[J].冰川冻土,2016,38(3):685-691. |
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| 作者姓名： | 徐湘田 王继伟 张明义 |
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| 作者单位： | 内蒙古大学 交通学院，内蒙古 呼和浩特 010070;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;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(41301072；41230630；41271076)；国家重点基础研究发展计划资助(973计划)项目(2012CB026102)；内蒙古自治区自然科学基金项目(2013MS0702)；冻土工程国家重点实验室开放基金项目(SKLFSE201208)；内蒙古大学高层次人才引进科研项目(30105-125146)；内蒙古大学博士后启动项目(21200-5152604) |
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| 摘 要： | 对饱和冻结和林黄土在-2℃的温度条件下进行了单轴压缩试验和围压范围为1~5 MPa的三轴压缩试验.试验结果表明:单轴压缩的应力应变曲线为应变软化型曲线,而三轴压缩试验中各围压下的应力应变曲线均为应变硬化型曲线,围压主要影响冻结和林黄土的初始变形行为,而对后期的变形影响不大;各围压下冻结黄土的体积应变都呈现出先体缩后体胀的特征,总体变均较小;围压对冻结和林黄土的屈服极限和强度影响不大;研究了初始切线模量的确定方法,用修正的Duncan-Chang模型对不同应变范围内的试验数据进行拟合,并由此确定了相应的初始切线模量,发现在0~4%应变范围拟合试验数据确定初始切线模量最为合理.
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| 关 键 词： | 冻结和林黄土 应力应变曲线 弹性模量 强度 |
Experimental study of the mechanical properties of frozen Helin Loess |
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| XU Xiangtian,WANG Jiwei,ZHANG Mingyi.Experimental study of the mechanical properties of frozen Helin Loess[J].Journal of Glaciology and Geocryology,2016,38(3):685-691. |
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| Authors: | XU Xiangtian WANG Jiwei ZHANG Mingyi |
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| Abstract: | A uniaxial compression test and a series of triaxial compression tests with confining pressures from 1 to 5 MPa were conducted on saturated frozen Helin Loess at-2℃. The experimental results indicate that stress-strain curves under uniaxial compression show strain softening phenomenon,while strain hardening phenomena appear in the stress-strain curves under different triaxial compressions. The influence of confining pressures on the initial deformation behavior of frozen loess is obvious,but the later deformation behavior is hardly affected by the confining pressures. The volumetric strains under various confining pressures are compressed at the begin-ning and then shift to be expanded. But the volumetric strains are small as a whole. The yield limit and strength of frozen Helin Loess are hardly affected by confining pressures. A method to determine the initial tangent modu-lus was investigated. The modified Duncan-Chang’s model was adopted to fit the test data under different ranges of strain and to determine the initial tangent modulus. It is found that the most reasonable range of strain for fit-ting the test data and determining the initial tangent modulus is 0~4%. |
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| Keywords: | frozen Helin Loess stress-strain curve elastic modulus strength |
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