模拟堆石料颗粒破碎对强度变形的影响

刘萌成; 高玉峰; 刘汉龙

模拟堆石料颗粒破碎对强度变形的影响 English Version

（ 1. 河海大学岩土力学与堤坝工程教育部重点实验室，南京 210098 ； 2. 浙江工业大学建筑工程学院，杭州 310014 ）

详细信息

作者简介:
刘萌成 (1972 – ) ，男，江西樟树人，博士，副教授，主要从事道路岩土材料工程特性方面的研究与教学工作。

中图分类号: TU432
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- 收稿日期: 2012-01-05
- 发布日期: 2011-11-14

Effect of particle breakage on strength and deformation of modeled rockfills

(1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 2. College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, China )

摘要

摘要: 许多试验事实表明，极高压力下颗粒材料粒径极限分布并非 Hardin 所谓的以 0.074 mm 为截断粒径的均匀分布。通过拓展破碎概念提出了 Hardin 破碎指标修正定义，并用以区分剪切过程中破碎的暂时和永久终止状态。开展了系列模拟堆石料固结排水大型三轴试验，提出了系列非线性关系用以描述模拟堆石料的级配、破碎指标以及应力–应变–体变响应变化规律。分析表明：随着围压增加，特征粒径减小而级配指标增加，试样级配变化明显；随着围压增加，峰值（或临界）状态破碎指标增加，相应的应力比和内摩擦角则减小，两种状态下破碎指标与内摩擦角具有唯一对应关系；同一剪切过程中，破碎指标变化率、剪胀率和塑性剪切模量具有非同步变化关系，由此形成了颗粒破碎对于模拟堆石料应力变形影响的复杂性。
- 模拟堆石料 /
- 颗粒破碎 /
- 破碎指标 /
- 强度变形 /
- 三轴试验
Abstract: Much experimental evidence suggests that for granular materials, the ultimate grain size distribution is not an arbitrary cut-off value of particle size (of 0.074 mm) proposed by Hardin in 1985 under extremely large confining pressure. A modified definition of Hardin’s breakage index is presented for crushable granular materials to characterize two processes of temporary or perpetual termination of breakage by further developing the concept of breakage. A series of consolidated drained large-scale triaxial tests are conducted for modeled rockfills, and nonlinear relationships are developed to describe appropriately the variation of particle grading, breakage index and the stress-strain-volume change response of modeled rockfills. The analysis of these results indicates that: (1) The particle size distributions of rockfills have some remarkable changes, which is demonstrated from the evidence that the characteristic particle sizes decrease and the grading indices increase with the increase of confining pressures ; (2) In the peak deviator stress or critical state, the breakage index increases, and the corresponding stress ratio or the internal frictional angle decreases with the increase of confining pressures, and the internal friction has an inherent relationship with the breakage index ; (3) During the same shearing process, the ratios of breakage index, plastic volumetric strain and deviator stress to plastic deviator strain are not in-phase, which leads to a complex effect of particle breakage on stress and deformation behaviors of modeled rockfills.
- modeled rockfills /
- particle breakage /
- breakage index /
- strength and deformation /
- triaxial test

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参考文献(27)

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模拟堆石料颗粒破碎对强度变形的影响 English Version

作者简介: 刘萌成 (1972 – ) ，男，江西樟树人，博士，副教授，主要从事道路岩土材料工程特性方面的研究与教学工作。

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Effect of particle breakage on strength and deformation of modeled rockfills

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出版历程

目录

作者简介:
刘萌成 (1972 – ) ，男，江西樟树人，博士，副教授，主要从事道路岩土材料工程特性方面的研究与教学工作。