| 高应力下颗粒材料一维力学特性研究(Ⅱ):蠕变性质 |
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| 引用本文： | 王者超,李术才.高应力下颗粒材料一维力学特性研究(Ⅱ):蠕变性质[J].岩土力学,2010,31(11):3392-3396. |
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| 作者姓名： | 王者超 李术才 |
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| 作者单位： | 1. 山东大学,岩土与结构工程中心,济南 250061;卡尔加里大学,土木工程系,加拿大,卡尔加里,T2N1N4
2. 山东大学 岩土与结构工程中心,济南,250061 |
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| 基金项目： | 高等学校博士学科点专项科研基金资助课题（No. 20060422002）。 |
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| 摘 要： | 现场和试验观测表明,高应力下砂土的蠕变过程伴随着颗粒破碎现象。通过开展砂土的一维蠕变试验发现,试样的颗粒破碎量随时间增加而增加,且蠕变速率与颗粒破碎速率成正比。在此基础上,分析了蠕变过程中能量转化关系,利用表面物理学和分形几何学理论,得到了一维蠕变条件下颗粒破碎速率与宏观蠕变速率之间的关系表达式。研究结果表明,高应力一维蠕变条件下颗粒材料的宏观蠕变速率与颗粒破碎速率成正比。最后,对该研究采用的等效化方法进行了讨论。
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| 关 键 词： | 砂土 一维蠕变 颗粒破碎 分形 表面张力 |
| 收稿时间： | 2009-07-24 |
One-dimensional mechanical behavior of granular materials at high stresses (Part Ⅱ): Creep behavior |
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| WANG Zhe-chao,LI Shu-cai.One-dimensional mechanical behavior of granular materials at high stresses (Part Ⅱ): Creep behavior[J].Rock and Soil Mechanics,2010,31(11):3392-3396. |
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| Authors: | WANG Zhe-chao LI Shu-cai |
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| Institution: | 1. Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan 250061, China; 2. Department of Civil Engineering, University of Calgary, Calgary T2N1N4, Canada |
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| Abstract: | It is shown in both field and laboratory observations that the creep process of granular materials is accompanied by grain crushing. One-dimensional creep tests were conducted on sands. It is found in the tests that the amount of crushed grains increases with time at specified stresses; and the grain crushing rate is directly proportional to creep rate. Based on these findings, energy conversion in the process of grain crushing is analyzed; and the relationship between grain crushing rate and creep rate is obtained. It is concluded that the creep rate is directly proportional to grain crushing rate when granular materials are subject to creep at high stresses. |
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| Keywords: | sands one-dimensional creep grain crushing fractals surface tension |
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