| 基于微结构失稳假说及广义吸力理论的黄土体变模型 |
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| 引用本文： | 刘旭,王兰民,陈龙珠,孙军杰.基于微结构失稳假说及广义吸力理论的黄土体变模型[J].岩土力学,2007,28(12):2517-2523. |
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| 作者姓名： | 刘旭 王兰民 陈龙珠 孙军杰 |
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| 作者单位： | 1. 中国地震局地震预测研究所兰州基地 兰州地震研究所 兰州 730000 ; 2. Department of physics, The University of Adelaide, SA 5005 Australia 3. 上海交通大学 建工学院，上海 200030 |
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| 摘 要： | 针对原状非饱和及饱和黄土的体积变形问题，提出了一个复合体计算模型。该模型将黄土看作由各自均匀分布于土中的原状部分和扰动部分组成的，这两部分土体的体积比率，可由黄土结构的微观几何模型、孔隙率密度曲线及考虑广义吸力的微结构失稳条件计算得出。假设原状部分仅发生弹性变形，扰动部分符合重塑土的变形规律。复合体的应变增量包括原状部分的弹性、重塑土的塑性及结构崩塌3部分；其中：结构崩塌变形特指微结构失稳时原状土体的孔隙率突然变为重塑土的孔隙率；重塑土的体积应变形采用广义吸力理论计算。采用不同的初始饱和度的黄土结构强度计算出非饱和土微观结构刚度与饱和度的函数，从而获得非饱和土黄土微观结构失稳的判别条件。分别计算了低含水天然非饱和及饱和黄土的压缩曲线，并与试验结果对比说明了模型的合理性。
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| 关 键 词： | 湿陷 微结构 失稳 黄土 |
| 文章编号： | 1000-7598-（2007）12-2517-07 |
| 收稿时间： | 2005-11-18 |
| 修稿时间： | 2006-04-10 |
A volumetric model of loess based on microstructure instability and generalized suction theories |
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| LIU Xu,WANG Lan-min,CHEN Long-zhu,SUN Jun-jie.A volumetric model of loess based on microstructure instability and generalized suction theories[J].Rock and Soil Mechanics,2007,28(12):2517-2523. |
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| Authors: | LIU Xu WANG Lan-min CHEN Long-zhu SUN Jun-jie |
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| Institution: | 1. Lanzhou Base of Center for Analysis and Prediction, CEA, Seismological Institute of Lanzhou, CEA, Lanzhou, 730000 China;2. Department of physics, The University of Adelaide, SA 5005 Australia; 3. School of Civil Engineering and Mechanics, Shanghai Jiaotong University, Shanghai 200030, China |
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| Abstract: | A new compound model is developed to calculate volumetric strains of unsaturated and saturated collapsible loess.In this model,loess is regarded as the compound of undisturbed and disturbed parts,both of which are respectively and uniformly distributed in loess;and the proportion of the two parts can be calculated through the combination of a pore size distribution curve;a suggested geometric structural model and structural instability criterion with the generalized suction being considered.The volumetric strain increment includes three components: the elastic increment of undisturbed part;the plastic increment of disturbed part determined by the application of the generalized suction theory;and the structure collapse contribution which is particularly relevant to the change of void ratio from undisturbed soils to disturbed soils.The relationship between the angle-stiffness of the structural instability criterion and the degree of saturation is determined by the structural strengths revealed by compression tests of natural loess.The rationality of this model is verified by comparing calculated results with published experimental data. |
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| Keywords: | collapse microstructure instability loess |
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