粗粒料变形特性的大型真三轴试验研究

左永振; 姜景山; 潘家军; 赵娜; 周跃峰

doi:10.11779/CJGE2019S2010

粗粒料变形特性的大型真三轴试验研究 English Version

1. 长江科学院水利部岩土力学与工程重点实验室,湖北武汉 430010;
2. 南京工程学院建筑工程学院,江苏南京 211167

基金项目: 国家重点研发计划项目（2017YFC0404804）; 国家自然科学基金-雅砻江联合基金重点项目（U1765203）; 长江科学院创新团队项目（CKSF2015051/YT）

详细信息

作者简介:
左永振(1980— ),男,高级工程师,硕士,主要从事粗粒土的工程特性与岩土力学可视化研究。E-mail: zuoyongzh@163.com。

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出版历程
- 收稿日期: 2019-04-28
- 发布日期: 2019-07-19

Deformation characteristics of coarse granular materials in large-scale true triaxial tests

1. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Changjiang River Scientific Research Institute, Wuhan 430010, China;
2. School of Architectural Engineering, Nanjing Institute of Technology, Nanjing 211167, China

摘要

摘要: 三维应力状态下粗粒料的变形性状对土石坝的沉降尤为重要。通过大型真三轴试验系统,对粗粒料开展了等小主应力等中主应力系数加载试验。试验结果表明：小主应力较小时,粗粒料的剪胀性较强,随着小主应力的增大,粗粒料的剪缩性逐渐增强。中主应力系数从0增大到0.5时,粗粒料的剪胀性基本上是逐渐减小的,而当中主应力系数增大到0.75时,剪胀性又有所增强。大主应变均表现为压缩变形,小主应变均产生膨胀变形,中主应变在一般三维应力状态下表现为压缩变形,而在常规三轴应力状态下中主应变则产生膨胀变形。
- 粗粒料 /
- 三维应力状态 /
- 中主应力 /
- 变形特性 /
- 大型真三轴试验
Abstract: The deformation behaviors of coarse granular materials under three-dimensional stress state are crucial to the settlement of earth-rockfill dams. A series of tests under constant minor principle stress and constant coefficient of intermediate principle stress are conducted by the large-scale true triaxial test system. The test results show that the dilatancy of coarse granular materials is quite strong when the minor principle stress is small. The contraction of coarse granular materials is enhanced when the minor principle stress increases. The dilatancy becomes weaker when the coefficient of the intermediate principle stress increases from 0 to 0.5. But the dilatancy becomes a little bit of stronger when the coefficient of the intermediate principle stress increases to 0.75. The major principle strain behaves as contraction and the minor principle strain shows as dilatancy in all the large-scale true triaxial tests. The intermediate principle strain is compressed under the normal three-dimensional stress state. However, the dilatancy occurs in the direction of the intermediate principle stress under the conventional triaxial stress state.
- coarse granular material /
- three-dimensional stress state /
- intermediate principal stress /
- deformation characteristic /
- large-scale true triaxial test

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参考文献(5)

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