颗粒摩擦对颗粒材料剪切行为影响的试验研究

戴北冰; 杨峻; 周翠英

doi:10.6052/0459-1879-12-250

颗粒摩擦对颗粒材料剪切行为影响的试验研究

doi: 10.6052/0459-1879-12-250

1.
中山大学工学院岩土工程与信息技术研究中心, 广州510275
2. 香港大学土木工程系, 香港

基金项目: 香港大学基础研究基金(10208227,10400889)和国家自然科学基金(51209237,41030747)资助项目.

详细信息

通讯作者:
戴北冰,讲师,主要研究方向:宏细观岩土力学与本构关系.E-mail:beibing_dai@yahoo.com.cn

中图分类号: TU43
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- 被引次数: 0
出版历程
- 收稿日期: 2012-09-14
- 修回日期: 2012-12-19
- 刊出日期: 2013-05-18

AN EXPERIMENTAL STUDY ON THE EFFECT OF INTER-PARTICLE FRICTION ON SHEAR BEHAVIOR OF GRANULAR MATERIALS

1.
Research Institute of Geotechnical Engineering and Information Technology, School of Engineering, Sun Yat-Sen University, Guangzhou 510275, China
2. Department of Civil Engineering, The University of Hong Kong, Hong Kong, China

Funds: The project was supported by the University of Hong Kong under Seed Funding for Basic Research Scheme (10208227, 10400889) and the National Natural Science Foundation of China (51209237, 41030747).

摘要

摘要: 通过对一种类似于土的颗粒材料——玻璃珠开展一系列室内直剪试验,研究颗粒间摩擦对颗粒材料剪切行为的影响. 试验一共考虑了4种不同的摩擦情况:干燥状态、用水浸润状态、完全淹没在水中和用油浸润状态. 分析试验结果发现,与干燥状态试样相比,用油浸润能明显降低试样的剪胀性和抗剪强度,而用水浸润和淹没在水中的方法没有产生显著的影响. 此外,通过在剪胀关系式中引入可变剪胀系数来考虑颗粒摩擦对颗粒材料剪胀性的影响,并从颗粒滑动与滚动的细观机理上初步解释了颗粒滑动摩擦角对临界状态摩擦角的影响规律.
- 颗粒摩擦 /
- 颗粒材料 /
- 直剪试验 /
- 剪胀关系 /
- 临界状态
Abstract: This paper describes an investigation into the effect of inter-particle friction on shear behavior of granular materials, by performing a series of direct shear tests on an analogous soil - glass bead. In this test study, four types of inter-particle friction conditions are concerned, including dry state, water-lubricated state, flooded state and oil-lubricated state. An analysis of the test results reveals that oil lubrication is able to significantly decrease dilatancy and shear strength of granular specimens, whereas the means of water lubrication and complete submergence in water do not exert a notable effect. Based on test results, a stress-dilatancy equation is proposed that is able to properly take into account the effect of inter-particle friction on the dilatancy of granular materials. The effect of inter-particle sliding friction angle on critical state friction angle is preliminarily examined from a perspective of microscopic particle motions, namely, particle sliding and rolling.
- inter-particle /
- friction,granular /
- material,direct /
- shear /
- test,stress-dilatancy

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