| 颗粒级配对粒状材料不排水力学特性的影响 |
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| 引用本文： | 刘映晶,李罡,尹振宇,夏小和,王建华.颗粒级配对粒状材料不排水力学特性的影响[J].岩土力学,2015,36(2):423-429. |
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| 作者姓名： | 刘映晶 李罡 尹振宇 夏小和 王建华 |
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| 作者单位： | 1.上海交通大学 船舶海洋与建筑工程学院土木工程系，上海 200240；2.南特中央理工大学 土木与力学学院，法国 南特 44300； 3.上海市隧道工程轨道交通设计研究院，上海 200235；4.中交第三航务工程勘察设计院有限公司，上海 200032 |
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| 基金项目： | 国家自然科学基金(No.41240024，No.41172251，No.41372285，No.51161130523，No.41002095，No.41272317)；欧盟玛丽居里行动计划(No. PIAPP-GA-2011-286397)；高等学校博士学科点专项科研基金(No.20110073120012)；上海市浦江人才计划项目(No.11PJ1405700)。 |
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| 摘 要： | 为了研究颗粒级配对粒状材料不排水力学特性的影响，采用两种形状自相似度很高的材料（玻璃球和Hostun砂）进行了一系列传统三轴不排水压缩试验。对于每种材料，保持相近的相对密实度制作了6个不同颗粒级配（不均匀系数 1.1～20）的试样，然后进行剪切。试验结果表明，颗粒级配对粒状材料的不排水力学性能存在明显影响：两种材料试样的偏应力水平随着不均匀系数的增加而降低，抗剪强度随着材料的不均匀系数 的增加而降低，并在 5后呈现出趋稳势态。基于不排水剪切试验中颗粒集合体二阶功的演化规律，对材料受荷载过程中出现不稳定性的条件进行分析。结果表明，在相同密实度下，粒状材料的静态液化潜能随着材料不均匀系数 的提高而增强，高不均匀系数的材料变得不稳定。
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| 关 键 词： | 颗粒级配 三轴不排水试验 不稳定性 相对密实度 粒状材料 |
| 收稿时间： | 2013-10-28 |
Influence of grain gradation on undrained mechanical behavior of granular materials |
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| LIU Ying-jing,LI Gang,YIN Zhen-yu,XIA Xiao-he,WANG Jian-hua.Influence of grain gradation on undrained mechanical behavior of granular materials[J].Rock and Soil Mechanics,2015,36(2):423-429. |
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| Authors: | LIU Ying-jing LI Gang YIN Zhen-yu XIA Xiao-he WANG Jian-hua |
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| Institution: | 1. Department of Civil Engineering, School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 2. Research Institute in Civil and Mechanical Engineering, UMR CNRS, 6183, Ecole Centrale Nantes, Nantes 44300, France; 3. Shanghai Tunnel Engineering & Rail Transit Design and Research Institute, Shanghai 200235, China; 4. CCCC Third Harbor Consultants Co., Ltd., Shanghai 200032, China |
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| Abstract: | This paper studies the influence of grain gradation on the undrained mechanical behavior of granular materials. A series of conventional undrained triaxial compression tests is carried out on two different materials (glass balls and Hostun sand), which have high degree of shape self-similarity. For each material, 6 samples with similar relative density and different gradations ( 1.1-20) are prepared, and then the samples are sheared. Test results show that the grain gradation has an obvious impact on the undrained mechanical behavior of granular material: both deviatoric stress level and undrained shear strength of two material samples decreases as the coefficient of uniformity ( ) of the material increases, their variations tend to converge as coefficient of uniformity surpasses 5. Based on the evolution of the value of the second-order work of the granular assembly during undrained triaxial loading, potential instability for the selected granular materials is also analyzed. The results demonstrate a significant influence of the grain gradation on stability: the higher of coefficient of uniformity ( ), the larger of the potential of static liquefaction and the unstabler of materials. |
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| Keywords: | grain gradation undrained triaxial test instability relative density granular material |
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