| 不排水条件下砾石土的应变率效应 |
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| 引用本文： | 詹传妮,王琛,何昌荣.不排水条件下砾石土的应变率效应[J].岩土力学,2011,32(Z1):428-0432. |
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| 作者姓名： | 詹传妮 王琛 何昌荣 |
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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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| 基金项目： | 国家自然科学基金资助项目(No.50909068) |
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| 摘 要： | 为研究应变率对砾石土应力、应变、强度特性的影响和应变率效应产生机制，对砾石和黏土混合备制的饱和砾石土心墙料，在应变率0.028～0.690 %/min范围内进行了不同围压下的固结不排水三轴压缩试验，定量地分析了三轴不排水抗剪强度的应变率效应。试验结果表明，不同的应变率下砾石土应力-应变曲线具有相似性；应变率增大10倍，不排水抗剪强度增大7.4%～29.9%；砾石土的应变率效应是剪切产生的孔隙水压力和土料本身黏滞性共同作用的结果，在不同的围压下二者发挥的程度不同
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| 关 键 词： | 砾石土 应变率 抗剪强度 应力-应变曲线 压缩试验 |
| 收稿时间： | 2010-09-27 |
Effects of strain rate on gravelly soil under undrained condition |
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| ZHAN Chuan-ni,WANG Chen,HE Chang-rong.Effects of strain rate on gravelly soil under undrained condition[J].Rock and Soil Mechanics,2011,32(Z1):428-0432. |
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| Authors: | ZHAN Chuan-ni WANG Chen HE Chang-rong |
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| Institution: | School of Water Resources and Hydropower, Sichuan University, Chengdu 610065, China |
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| Abstract: | In order to study the effects of strain rate on strength and stress-strain behavior of gravelly soil and its mechanism, consolidated-undrained triaxial compression tests under different confining pressures were carried out for saturated gravelly soil mixed by clay and gravel. Effects of strain rate on undrained strength were analyzed quantitatively within the strain rate range from 0.028 %/min to 0.690 %/min. According to those test results, it is shown that the stress-strain curves under different strain rates are similar. For this kind of gravelly soil, undrained strength would increase 7.4% - 29.9% with the increase of 10 times of strain rate. The effects of strain rate of gravely soil are caused by both pore water pressure induced by shearing and cohesion of the soil material. However, for these two aspects the degrees of influence on strain rate effects are different under different confining pressures. |
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| Keywords: | gravelly soil strain rate shear strength stress-strain curve compression test |
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