| 失水过程孔隙结构、孔隙比、含水率变化规律 |
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| 引用本文： | 李旭,张利民,敖国栋.失水过程孔隙结构、孔隙比、含水率变化规律[J].岩土力学,2011,32(Z1):100-105. |
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| 作者姓名： | 李旭 张利民 敖国栋 |
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| 作者单位： | 北京交通大学土木与建筑工程学院;武汉大学水资源与水电工程科学国家重点实验室;香港科技大学土木系; |
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| 基金项目： | 中央高校基本科研业务费专项资金资助项目(No.2009JBM065); 水资源与水电工程科学国家重点实验室开放基金资助项目(No.2010B075) |
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| 摘 要： | 当土体总应力状态保持不变时,基质吸力的提高是导致孔隙水排出、土样收缩、孔隙结构改变的主要原因。对于特定吸力下的土样,其微观孔隙结构决定了土壤孔隙比;而土壤孔隙结构,土壤基质吸力共同决定了土壤的含水率。假定在失水过程中,当孔隙水尚未排出时,其土壤孔隙孔径不会收缩,孔隙体积保持不变。可通过吸力建立起变化的土壤孔隙体积曲线和土-水特征曲线、土壤收缩曲线之间的对应关系:(1)累计孔隙体积曲线的包络线即为实际发生的土水特征曲线;(2)基于累计孔隙体积曲线,能够有效确定土样收缩曲线的上下限范围。
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| 关 键 词： | 孔隙结构 土-水特征曲线 收缩 吸力 失水过程 |
| 收稿时间： | 2011-02-18 |
Variations of pore structure,void ratio,and water content in soil drying process |
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| LI Xu,ZHANG Li-min,AO Guo-dong.Variations of pore structure,void ratio,and water content in soil drying process[J].Rock and Soil Mechanics,2011,32(Z1):100-105. |
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| Authors: | LI Xu ZHANG Li-min AO Guo-dong |
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| Institution: | 1. School of Civil Engineering and Architecture, Beijing Jiaotong University, Beijing 100044 China; 2. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China; 3. School of Civil Engineering, The Hong Kong University of Science and Technology, Hong Kong, China |
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| Abstract: | During the drying process of a soil under constant total stresses,the increase of soil suction will induce the drainage of pore-water and the shrinkage of soil pore-structure.For a soil at a particular state,the microstructure determines its void ratio;and the soil suction determines the water content.During the drying process,if the pores are assumed not to shrink until the pore-water drains,then soil suction provides a bridge between the soil microstructure and soil draining behavior represented by the so... |
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| Keywords: | pore-structure soil-water characteristic curve shrinkage suction drying process |
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