| 花岗片麻岩峰前围压卸荷条件下力学特性的实验研究 |
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| 引用本文： | 范永波,伍法权,和海芳,任爱武.花岗片麻岩峰前围压卸荷条件下力学特性的实验研究[J].水文地质工程地质,2011,38(3):54-58. |
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| 作者姓名： | 范永波 伍法权 和海芳 任爱武 |
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| 作者单位： | 中国科学院力学研究所环境力学重点实验室;中国科学院地质与地球物理研究所工程力学重点实验室;交通运输部公路科学研究院;中国水利水电科学研究院; |
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| 基金项目： | 973项目，国家自然科学基金项目 |
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| 摘 要： | 对小湾水电站坝基花岗片麻岩试件进行了室内不同直径、不同峰前围压卸荷试验。结果表明:相同围压下,卸载同加载相比,变形模量变化不大,但泊松比大幅增加,甚至会超过0.5;在相同围压卸荷时,不同尺寸的试样会呈现不同的破坏性状,尺寸越大,越容易产生张破坏;岩块的峰值强度随着围压升高呈线性增加,且尺寸越大受围压变化的影响越小,存在明显的尺寸效应。
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| 关 键 词： | 花岗片麻岩 峰前卸围压 力学参数 |
Experiment research about mechanical characteristic of gneissic granite while confining pressure is unloaded |
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| FAN Yong-bo,WU Fa-quan,HE Hai-fang,REN Ai-wu.Experiment research about mechanical characteristic of gneissic granite while confining pressure is unloaded[J].Hydrogeology and Engineering Geology,2011,38(3):54-58. |
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| Authors: | FAN Yong-bo WU Fa-quan HE Hai-fang REN Ai-wu |
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| Affiliation: | 1.Key Laboratory of Environmental Mechanics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100150,China;2.Key laboratory of Engineering Geo-mechanics,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;3.Resear |
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| Abstract: | Unloading confining pressure tests are conducted before different pre-peak confining pressure of gneissic granite obtained at the foundation of Xiaowan hydrodynamic station,the results show that the deformation modulus changes little,but poisson's ratio increases greatly compared with the loading conditions under the same confining pressure.Samples with different sizes will show different behaviors under the same unloading confining pressure,and the sample with a larger size will show tensile failure;The pe... |
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| Keywords: | gneissic granite pre-peak unloading confining pressure mechanical parameter |
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