非饱和疏水土的滞水性

Zheng Zhou, Ali Akbar Karimzadeh, Anthony Kwan Leung, Sum Yin Fok
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引用次数: 0

摘要

土质基础设施表层区域的疏水土会影响这些结构的水文过程。疏水土的滞水曲线(WRC)对这些水文过程起着支配作用,但却鲜有报道。现有仪器无法测量非饱和土壤的滞水曲线,因为它们无法控制接触角大于 90° 时孔隙水压力(uw)超过孔隙气压(ua)的情况。本研究创建了一种新仪器,用一对高进水量(WEV)膜和高进气量(AEV)陶瓷盘夹住土样,以控制 uw < ua 和 uw > ua 条件。测量了测试材料在干湿循环过程中的接触角滞后和半月板演变,以解释 WRC。结果表明,土壤的 WEV 随化学异质性和颗粒大小的减小而增大。在干燥疏水性土壤时,它们可以在达到一定的负 uw 值之前保持水分。第二个润湿周期确定的 WEV 低于第一个周期,而 AEV 基本保持不变。当疏水材料的粒径增大时,WEV 和 AEV 会减小,从而导致滞后尺寸变小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Hysteretic water retention behaviour of unsaturated hydrophobised soils
Hydrophobised soils found in the superficial region of earthen infrastructure can affect the hydrological processes of these structures. Hysteretic water retention curve (WRC), which governs these processes, for hydrophobised soils has rarely been reported. Existing apparatus was unable to measure the WRC of unsaturated soil as they cannot control the condition of pore water pressure (uw) in excess of pore air pressure (ua) when the contact angle is larger than 90°. This study created a new apparatus, which sandwiches a soil sample by a pair of high water-entry value (WEV) membrane and a high air-entry value (AEV) ceramic disk, to control the uw < ua and uw > ua conditions. Contact angle hysteresis and menisci evolution in the test materials during wet–dry cycles were measured to interpret the WRC. Results show that the WEV of soil was increased with decreasing chemical heterogeneity and particles size. When drying the hydrophobised soils, they could retain water before reaching a certain negative uw. The WEV identified from the second wetting cycle was lower than that from the first cycle, whereas the AEV remained largely unchanged. The WEV and AEV decreased when the particle size of the hydrophobised materials was increased, resulting in a smaller hysteresis size.
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