| 初始孔隙比对高吸力下非饱和土土水特性的影响 |
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| 引用本文： | 陈嘉伟,李泽,韩哲,高游,熊勇林,丁瑞旋.初始孔隙比对高吸力下非饱和土土水特性的影响[J].水文地质工程地质,2022,49(4):47-54. |
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| 作者姓名： | 陈嘉伟 李泽 韩哲 高游 熊勇林 丁瑞旋 |
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| 作者单位： | 宁波大学土木与环境工程学院, 浙江 宁波 315211 |
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| 基金项目： | 浙江省省属高校基本科研业务费专项资金项目（SJLY2022007）；浙江省新苗人才计划项目（2020R405031）；浙江省自然科学基金项目（LY19E080012）； |
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| 摘 要： | 在我国西北干旱半干旱地区，处于高吸力范围内的非饱和土广泛存在于各种岩土工程中。非饱和土土水特性的研究是非饱和土渗流、强度与变形研究的基础。为研究高吸力下不同初始孔隙比非饱和土的土水特性，以一种粉土试样作为研究对象，采用饱和盐溶液蒸汽平衡法控制土试样的吸力，利用阿基米德原理量测不规则土试样的体积，通过修正的Van-Gen...
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| 关 键 词： | 非饱和土 高吸力 初始孔隙比 土水特征曲线 |
| 收稿时间： | 2021-06-18 |
Effect of initial void ratio on the soil water characteristics of unsaturated soil at high suctions |
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| Affiliation: | School of Civil and Environmental Engineering, Ningbo University, Ningbo, Zhejiang 315211, China |
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| Abstract: | In arid and semi-arid regions, such as in northwestern China, unsaturated soils at high suction or over a wide suction range are widespread in various geotechnical designs. Studies of the soil water retention behavior are fundamental to a comprehensive understanding of the water flow, deformation processes, and shears strength for unsaturated soils. To investigate the soil water retention behavior of a silt over a high suction range, the suction is imposed on silt specimens using the vapor equilibrium technique, and the volume of irregular soil sample is measured using the Archimedean method. The soil water characteristic curves (SWCCs) with different initial void ratios at high suctions were simulated by the modified Van Genuchten’s model. The results show that (1) SWCCs in terms of water content versus suction relation with different initial void ratios are independent of the initial void ratio at high suctions. That is, soil water retention at high suctions is mainly related to adsorbed water content. (2) It was found that the fitting results of the existing equation based on Van Genuchten’s model can not accurately simulate the soil water retention behavior over a high suction range. A modified soil water characteristic equation is proposed by introducing a correcting function into the equation. (3) A modified relative permeability coefficient equation is proposed and it can be applied to predict the relative permeability coefficient with different initial void ratios. The predicted results are in good agreement with the measured values. |
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