| 单轴载荷下冻土的导电性及机敏性能试验研究 |
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| 引用本文： | 付伟,汪稔,李志清,胡明鉴.单轴载荷下冻土的导电性及机敏性能试验研究[J].岩土力学,2009,30(7):1974-1980. |
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| 作者姓名： | 付伟 汪稔 李志清 胡明鉴 |
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| 作者单位： | 1.中国科学院武汉岩土力学研究所 岩土力学与工程国家重点试验室，武汉 430071；2.中国科学院寒区旱区环境与工程研究所 冻土工程国家重点试验室，兰州 730000；3.中国科学院地质与地球物理研究所 工程地质力学重点试验室，北京 100029 |
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| 基金项目： | 国家自然科学基金，中国科学院冻土工程国家重点实验室开放项目 |
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| 摘 要： | 针对青藏铁路北麓河粉质黏土，利用电阻率－应力－应变试验设备，获取了不同温度单轴压缩条件下的电阻率-应力-应变全过程曲线，探讨了冻土导电性能及其机敏性。试验结果表明，在含水率 、干密度 、加载应变率为1 mm/min试验条件下，初始电阻率 、最大电阻率 、最大切线模量对应的电阻率 随温度降低而同步增大；冻土在压缩过程中具有较强的压敏性，随着压应力增大，电阻率变化可分为电阻率减小区、平衡区和剧增区；冻土单轴最大切线模量与温度之间呈线性关系，最大切线模量对应的应力及应变 、 、峰值应力对应应变 表现出温度敏感性，当 ℃时， 、 、 值最小；当 ℃时， 、 、 值随T降低而增大，冻土随温度降低延性增强脆性减弱；当 ℃时 、 、 值随 降低而增大，冻土随温度降低，脆性增强，延性减弱。
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| 关 键 词： | 冻土 单轴压缩 切线模量 应力-应变-电阻率 机敏性 温度 青藏铁路 |
| 收稿时间： | 2009-01-12 |
Experimental study of electrical resistivity properties and alert performance of frozen soil under uniaxial load |
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| FU Wei,WANG Ren,LI Zhi-qing,HU Ming-jian.Experimental study of electrical resistivity properties and alert performance of frozen soil under uniaxial load[J].Rock and Soil Mechanics,2009,30(7):1974-1980. |
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| Authors: | FU Wei WANG Ren LI Zhi-qing HU Ming-jian |
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| Institution: | 1. State Key Laboratory of Geomechanics and Geotechnical Engineering ,Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environment and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 3. Key Laboratory of Engineering Geomechanics, Institute of Geolog and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | Using the frozen soil uniaxial compressive apparatus combined with electrical resistivity observation for whole process, a series of uniaxial compressive tests under different environmental temperatures are performed for the clay in Beilu River with an initial water content of 17.8 % and dry density of 1.71 g/cm3 under a loading strain rate of 1 mm/min, in which the complete testing data for the stress -strain curve and the associated electrical resistivity-strain curve are obtained. The experimental results indicate that,, are increased with decrement of the temperature T and they are changed synchronically. The frozen soil performs highly pressure-sensitivity, with the increasing of stress, the procedure of electrical resistivity includes three stages: decreasing stage, balance stage and sharply increasing stage. There is the linear relationship between the largest tangent modulus and temperature. ,,show sensitivity to temperature, the value of,,is minimum when the temperature is -15℃. The ductibility of frozen soil is enhanced and its brittleness is reduced; at the same time,,are increased with the decreasing of the temperature, when℃.The frozen soil has opposite characters when ℃. |
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| Keywords: | frozen soil uniaxial compressive strength tangent modulus stress-strain- electrical resistivity alert performance temperature Qinghai-Tibet Railway |
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