| 动扭剪试验中砂土液化后流动特性分析 |
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| 引用本文： | 刘汉龙,陈育民.动扭剪试验中砂土液化后流动特性分析[J].岩土力学,2009,30(6):1537-1541. |
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| 作者姓名： | 刘汉龙 陈育民 |
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| 作者单位： | 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. 河海大学 岩土工程科学研究所，南京 210098 |
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| 基金项目： | 中国地震局地震工程与工程振动部门开放实验室课题，江苏省博士后科研资助计划，江苏省青蓝工程创新团队资助项目 |
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| 摘 要： | 土体在初始液化后仍然可能承受动荷载作用发生大变形。引入流体力学中的剪应变率和表观黏度的概念，对振动扭剪试验中饱和砂土液化后的流动特性进行了分析。分析中将砂土的状态分为0有效应力状态和非0有效应力状态。结果表明，砂土在0有效应力状态下表现出与静扭剪试验类似的“剪切稀化”非牛顿流体的特征，表观黏度随着剪应变率的增大而减小。加载周数对“剪切稀化”状态下的剪应变率幅值有影响，随着加载周数的增加，剪应变率幅值逐渐增大，而对流动曲线的形状没有影响。在非0有效应力状态下，砂土的表观黏度随应变的增大而增大，随孔压比的减小而增大，且所有的试验得到的表观黏度与孔压比具有一致关系。
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| 关 键 词： | 初始液化后 空心振动扭剪试验 砂土 流体 流动特性 黏度 剪应变率 |
| 收稿时间： | 2008-08-19 |
Analysis of flow characteristics of dynamic torsional tests on post liquefied sand |
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| LIU Han-long,CHEN Yu-min.Analysis of flow characteristics of dynamic torsional tests on post liquefied sand[J].Rock and Soil Mechanics,2009,30(6):1537-1541. |
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| Authors: | LIU Han-long CHEN Yu-min |
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| Institution: | 1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 2. Geotechnical Research Institute, Hohai University, Nanjing 210098, China |
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| Abstract: | Large deformation may occur in the post initial liquefied sand undergone the dynamic loading. The definitions of shear strain rate and apparent viscosity in fluid mechanics are introduced to analyze the dynamic hollow torsional tests of post initial liquefied sand. There are two states in the post liquefied sand: zero effective stress state and non-zero effective stress state. The conclusions show that the sand characterized by shear-thinning non-Newtonian fluid in zero effective stress state which is similar to the static torsional tests. The loading cycle number does not have influence on the shape of flow curves under shear–thinning state except for the amplitude of shear strain rate, which increases with the increase of cycle number. Under non–zero effective stress state, the apparent viscosity increases with the increase of strain and the decrease of pore pressure. The apparent viscosity, which obtained from all tests, has a unitary formulation with the pore pressure ratio. |
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| Keywords: | post initial liquefaction dynamic hollow torsional test sandy soil fluid flow characteristics viscosity shear strain rate |
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