| 不同温度下冻土单轴抗压强度与电阻率关系研究 |
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| 引用本文： | 付伟,汪稔,胡明鉴,向焱红.不同温度下冻土单轴抗压强度与电阻率关系研究[J].岩土力学,2009,30(1):73-78. |
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| 作者姓名： | 付伟 汪稔 胡明鉴 向焱红 |
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| 作者单位： | 1.中国科学院武汉岩土力学研究所，武汉 430071；2.武汉福德(香港)路桥管理有限公司，武汉 430000 |
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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课题 |
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| 摘 要： | 为了研究青藏铁路路基在载荷下的力学行为，探索新型手段快速准确地估计冻土的单轴抗压强度参数，采用北麓河粉质黏土在室内进行了不同温度的冻土单轴压缩试验，并全过程监测土样电阻率的变化，得到了冻土的应力-应变-电阻率全过程曲线。试验结果表明，在干密度 1.71 g/cm3且含水率 17.83 %下，冻土的单轴抗压强度随温度降低而线性增加；初始电阻率 随温度降低逐渐增大，从-20℃对温度的敏感性开始显著增强；冻土单轴抗压强度与初始电阻率之间满足半对数线性关系，相关性很好，因此测定初始电阻率可准确估算冻土的 。从应力-应变-电阻率全过程曲线来看，冻土在单轴载荷作用下经历的压密、弹性变形、塑性屈服、破裂后各阶段对应电阻率变化趋势是快速减小至最小、稳定增加、剧烈增加，这种关联的变化关系也说明用电阻率法来研究冻土强度及载荷下的变形问题是可行的。
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| 关 键 词： | 冻土 单轴压缩强度 电阻率 应力-应变-电阻率 温度 青藏铁路 |
| 收稿时间： | 2008-02-26 |
Study of relationship between uniaxial compressive strength and electrical resistivity of frozen soil under different temperatures |
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| FU Wei,WANG Ren,HU Ming-jian,XIANG Yan-hong.Study of relationship between uniaxial compressive strength and electrical resistivity of frozen soil under different temperatures[J].Rock and Soil Mechanics,2009,30(1):73-78. |
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| Authors: | FU Wei WANG Ren HU Ming-jian XIANG Yan-hong |
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| Institution: | 1. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. Wuhan Fude(Hong Kong) Road & Bridge Management Co., Ltd., Wuhan 430000, China |
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| Abstract: | In order to study the mechanical behaviour of frozen soil under the roadbed of the Qinghai-Tibet Railway and explore a new method to estimate the uniaxial compressive strength quickly and correctly, the stress-strain-electrical resistivity experiments for the clay in Beilu River are done under different temperatures during the whole process of uniaxial compression. The complete testing data for the stress -strain curve and the associated electrical resistivity -strain curve are obtained. The experimental results indicate that the uniaxial compressive strength increases with decrement of the temperature T, and they follow the linear relationship. The initial electrical resistivity rises while the temperature decreases; however, initial electrical resistivity increases sharply with increment of T when ℃. The relationship between uniaxial compressive strength and the initial electrical resistivity can be described as linear Semi-logarithmic equation , whose correlation coefficient is very high, so can be quickly and correctly estimated by which can be measured more conveniently. The stress-strain curve can be separated into compression stage, elastic stage, plastic flow stage, break-up stage corresponding to decreasing fast stage, decreasing to minimum stage, steady increasing stage, unsteady increasing stage in resistivity-strain curve. This associated relationship indicates that the strength and displacement problem can be effectively solved by the electrical resistivity method. |
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| Keywords: | frozen soil uniaxial compressive strength electrical resistivity stress-strain-electrical resistivity temperature Qinghai- Tibet Railway |
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