| 粗粒料大型三轴试验的尺寸效应研究 |
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| 引用本文： | 李翀,何昌荣,王琛,赵红芬.粗粒料大型三轴试验的尺寸效应研究[J].岩土力学,2008,29(Z1):563-566. |
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| 作者姓名： | 李翀 何昌荣 王琛 赵红芬 |
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| 作者单位： | 四川大学 水利水电学院，成都 610065 |
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| 摘 要： | 采用大型三轴仪，对双江口高土石坝的砂岩过渡料进行试验研究。通过对不同试样直径D和不同最大粒径dmax的过渡料进行等?3应力路径试验，分析了D、dmax对应力-应变-强度特性的影响，研究了室内试验存在的尺寸效应。结果表明，对同一种级配试样，破坏主应力差、内摩擦角和初始切线模量随试样直径的减小而增大；在低围压下破坏主应力差和内摩擦角的增大趋势明显，但随围压增大，增大幅度减小；对同样的试样直径，最大粒径增大，破坏主应力差和内摩擦角增大，同样这种增大趋势在低围压下明显。
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| 关 键 词： | 粗粒料 大型三轴试验 尺寸效应 应力-应变-强度特性 |
| 收稿时间： | 2008-07-24 |
Study of scale effect of large-scale triaxial test of coarse-grained meterials |
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| LI Chong,HE Chang-rong,WANG Chen,ZHAO Hong-fen.Study of scale effect of large-scale triaxial test of coarse-grained meterials[J].Rock and Soil Mechanics,2008,29(Z1):563-566. |
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| Authors: | LI Chong HE Chang-rong WANG Chen ZHAO Hong-fen |
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| Institution: | School of Water Rsources & Hydropower, Sichuan University, Chengdu 610065, China |
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| Abstract: | Testing studies of transition zone material of sandstone for Shuangjiangkou high embankment dam are performed with large-scale triaxial apparatus. Through test of constant ?3 stress path on transition zone materials with different sample sizes and different maximum sizes of grain, the influences of D, dmax on stress-strain-strength characteristics are analyzed to study the scale effect that exists in laboratory tests. The results indicate that the failure principal stress, internal friction angle and initial tangent elastic modulus increase as the sample size decreases for a kind of sample with same grading. And the increasing trend of failure principal stress and internal friction angle is obvious under low confining pressure, while the increasing range decreases with the raising of confining pressure. For the same size sample, the failure principal stress and internal friction angle increase with the increasing of maximum sizes of grain and the increasing trend is also significant under low confining pressure. |
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| Keywords: | coarse-grained material large-scale triaxial test scale effect stress-strain-strength characteristics |
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