| 不同应力路径下粗粒料力学特性试验研究 |
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| 引用本文： | 杨光,孙逊,于玉贞,张丙印.不同应力路径下粗粒料力学特性试验研究[J].岩土力学,2010,31(4):1118-1122. |
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| 作者姓名： | 杨光 孙逊 于玉贞 张丙印 |
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| 作者单位： | 清华大学,水沙科学与水利水电工程国家重点实验室,北京,100084 |
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| 基金项目： | 国家自然科学基金委员会、二滩水电开发有限责任公司雅砻江水电开发联合研究基金项目，清华大学水沙科学与水利水电工程国家重点实验室课题，高等学校博士学科点专项科研基金资助课题 |
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| 摘 要： | 采用大型三轴试验机，对粗粒料进行了常规三轴、等p和等应力比等不同应力路径的试验。通过对试验结果进行对比分析，研究了粗粒料在不同应力路径下的应力-应变、变形和强度特性，并对粗粒料的卸载体缩现象进行了分析和探讨。结果表明，应力路径对粗粒料的应力-应变和变形特性影响较大，而对强度特性影响较小；卸载体缩主要是由偏应力比η的变化所引起的，与应力路径关系很大。
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| 关 键 词： | 粗粒料 应力路径 变形和强度特性 卸载体缩 |
| 收稿时间： | 2008-07-08 |
Experimental study of mechanical behavior of a coarse-grained material under various stress paths |
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| YANG Guang,SUN Xun,YU Yu-zhen,ZHANG Bing-yin.Experimental study of mechanical behavior of a coarse-grained material under various stress paths[J].Rock and Soil Mechanics,2010,31(4):1118-1122. |
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| Authors: | YANG Guang SUN Xun YU Yu-zhen ZHANG Bing-yin |
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| Institution: | State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | A series of large-scale triaxial tests under different stress paths are performed, including the conventional triaxial tests, constant p tests and constant stress ratio tests. Based on the comparison of test results, the stress-strain, deformation and strength characteristics of a coarse-grained material under different stress paths are investigated. Meanwhile, the phenomena of the volume-contraction in unloading is discussed. The test results indicate that the stress path has obvious influence on the stress-strain and deformation characteristics of the coarse-grained material, but little influence on strength characteristics. The volume-contraction in unloading of the coarse-grained material is caused by the change of deviatoric stress ratio and is related to stress path of test. |
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| Keywords: | coarse-grained material stress path deformation and strength characteristics volume-contraction in unloading |
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