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| 基于微结构失稳假说的湿陷性黄土体积应变计算 | |
| 引用本文： | 刘旭,陈龙珠,王兰民,王峻.基于微结构失稳假说的湿陷性黄土体积应变计算[J].岩土力学,2005,26(7):1023-1028. |
| 作者姓名： | 刘旭 陈龙珠 王兰民 王峻 |
| 作者单位： | 1. 上海交通大学,建工学院,上海,200030;中国地震局分析预报中心兰州基地,兰州地震研究所,兰州,730000 2. 上海交通大学,建工学院,上海,200030 3. 中国地震局分析预报中心兰州基地,兰州地震研究所,兰州,730000 |
| 基金项目： | 甘肃省自然科学基金(No.GZS041-A25-014)，国家自然科学基金(No.50379049)资助。 |
| 摘 要： | 针对黄土的湿陷变形问题，提出了一个微观结构模型，并由微观孔隙体积分布函数和黄土微结构的失稳判别条件，计算出土样中原状部分与扰动部分的体积比率；按复合体串联的力学模式推导出原状黄土的崩塌性体积-应变关系；计算实例与试验结果比较符合。尽管黄土的结构强度随含水量的不同而剧烈变化，但一些压缩试验表明：结构破坏阶段的压力范围在对数坐标中基本保持不变，且压缩曲线相互平行，这一现象用孔隙失稳的必要条件得到了证明。 |
| 关 键 词： | 湿陷 微结构 稳定性 黄土 |
| 文章编号： | 1000-7598-(2005)07-1023-06 |
| 收稿时间： | 2004-02-02 |
| 修稿时间： | 2004年2月2日 |
Calculation for volumetric strain of collapsible loess considering microstructure instability |
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| LIU Xu,CHEN Long-zhu,WANG Lan-min,WANG Jun.Calculation for volumetric strain of collapsible loess considering microstructure instability[J].Rock and Soil Mechanics,2005,26(7):1023-1028. | |
| Authors: | LIU Xu CHEN Long-zhu WANG Lan-min WANG Jun |
| Institution: | 1.School of Civil Engineering and Mechanics, Shanghai Jiaotong University, Shanghai 200030, China; 2. Seismological Institute of Lanzhou, Lanzhou Base of Center for Analysis and Prediction, CEA, Lanzhou 730000, China |
| Abstract: | A new method to calculate the volumetric strain of collapsible loess considering microstructure instability is developed. In this method, loess is regarded as the compound of disturbed part and undisturbed part. The volumetric proportion of the both parts, which represents the state of micro-structural damage and varies with the increase of effective load, can be calculated by the combination of an idealized microstructure model, the pore size distribution curve and the equilibrium criterion for microstructure. The method is verified by comparing the calculated results with the data of triaxial compression tests. In addition, some experiments show that compression curves of loess with different water contents are parallel with each other in the sections that represented progressive damage to microstructure. This phenomenon is successfully explained by the equilibrium criterion for microstructure. |
| Keywords: | collapse microstructure stability loess |
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