| 冻土三轴冻胀应力-应变试验方法研究 |
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| 引用本文： | 仇文革,孙兵.冻土三轴冻胀应力-应变试验方法研究[J].冰川冻土,2010,32(1):116-120. |
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| 作者姓名： | 仇文革 孙兵 |
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| 作者单位： | 西南交通大学,土木工程学院,四川,成都,610031;西南交通大学,土木工程学院,四川,成都,610031 |
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| 基金项目： | 西部交通建设科技项目(200431800029)资助 |
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| 摘 要： | 提出了一种试验方法,研究土体或破碎岩体在不同含水率、不同温度、不同应力状态下冻结后产生的冻胀应变与冻胀力之间的关系,并针对寒区隧道提出了一种新型三轴冻胀应力-应变关系.试验设备采用应变控制式三轴仪及低温冷冻库,通过改变测力环的刚度来实现不同约束状态,进而得到土体或破碎岩体在不同约束状态下冻结后产生的冻胀应变及冻胀力,将这些特征点进行回归分析即可得到冻胀应力应变关系.根据上述试验方法,对饱和砂土进行三轴冻胀应力-应变试验.结果表明:冻胀应力应变关系呈对数曲线变化,且冻胀力随冻胀应变的对数呈线性变化;轴向约束越强,冻胀应变越小,冻胀力越大,且冻胀力随轴向约束强度的增大趋于某一极值;围压越大,冻胀力和冻胀应变越大.
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| 关 键 词： | 三轴冻胀应力应变关系 冻胀力 寒区隧道 破碎岩体 |
Study of the Experiment Method for Triaxial Frost Heaving Constitutive Relations of Frozen Soil |
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| QIU Wen-ge,SUN Bing.Study of the Experiment Method for Triaxial Frost Heaving Constitutive Relations of Frozen Soil[J].Journal of Glaciology and Geocryology,2010,32(1):116-120. |
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| Authors: | QIU Wen-ge SUN Bing |
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| Institution: | School of Civil Eng.;Southwest Jiaotong University;Chengdu Sichuan 610031;China |
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| Abstract: | A new experiment method is introduced to study the relations between frost heaving strain and stress of soil or fracture rock under different moisture contents,temperatures and stress states.Based on experiment,a new triaxial frost heaving stress-strain relation is presented aiming at tunnel engineering in cold regions.The experimental equipments are strain-controlled and low temperature buildup,and different restrained conditions are controlled by changing the stiffness of a test-force-ring.Then the frost ... |
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| Keywords: | triaxial frost heaving stress-strain relation frost heaving stress tunnel in cold regions fracture rocks |
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