土壤保水曲线的动态效应:利用空间时域反射仪和张力计进行的全尺度土柱试验探索

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Guanxi Yan, Thierry Bore, Stefan Schlaeger, Alexander Scheuermann, Ling Li
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引用次数: 0

摘要

土壤保水曲线(SWRC)中的动态效应一直是许多研究的重点。然而,大多数研究采用的是几厘米的短柱试验,在这种情况下,半渗透多孔介质不可避免地会使动态效应最小化或放大。在本研究中,为了消除这一缺陷,我们进行了全尺寸砂柱试验,在非饱和区下准备了一个饱和区。使用高精度张力计和空间时域反射测量法监测了土壤吸力和湿度剖面,从而为动态 SWRC 提供了合理的超调范围。结果证实,动态主排水曲线与静态曲线存在过冲。根据土壤水分再平衡时间(τS)和动态系数(τp)对动态效应进行了定量估算,结果在以往研究的合理范围内。τp 随含水量的降低呈对数线性增长,可以很好地根据相应的 τS 和 SWRC 的一阶导数进行估算。此外,τp 随着土壤变得更细、分级更好而增大,这与石油研究中渗透率较低的储层更突出的动力效应一致,但与土壤-水文研究中渗透率较高的砂土更显著的动力效应不同。分析表明,动态效应并非仅受 τp 或渗透率的影响,还受地下水动态的影响。这一发现解释了高渗透性和超低渗透性土工材料的显著动态效应。因此,建议在对动态 SWRC 进行学术研究时,采用目前这种带有预制饱和区的全尺度土柱设置。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Dynamic effects in soil water retention curves: an experimental exploration by full-scale soil column tests using spatial time-domain reflectometry and tensiometers

Dynamic effects in soil water retention curves: an experimental exploration by full-scale soil column tests using spatial time-domain reflectometry and tensiometers

The dynamic effects in soil water retention curves (SWRCs) have been the focus of much research. However, most studies implemented short column tests in a few centimeters, under which a semi-permeable porous media inevitably minimizes or magnifies the dynamic effects. In this study, full-scale sand column tests were conducted to eliminate this flaw by preparing a saturated zone under the unsaturated one. The soil suction and moisture profiles were monitored using high-precision tensiometers and spatial time-domain reflectometry, thereby providing a rational overshooting range of the dynamic SWRC. The results confirm that the dynamic primary drainage curve overshoots the static one. The dynamic effects were estimated quantitatively from the soil moisture re-equilibrium time (τS) and dynamic coefficient (τp), falling within reasonable ranges from previous studies. The τp increases log-linearly with decreasing moisture content and can be estimated well from the corresponding τS and the first derivative of SWRC. Also, the τp increases as the soil becomes finer and better graded, which agrees with more-prominent dynamic effects for lower-permeability reservoirs from petroleum studies but disagrees with more-significant dynamic effects for higher-permeability sand from soil-hydrology studies. The analysis shows that the dynamic effects are not dominated solely by the τp or permeability but also by the groundwater dynamics, which can be seen as a pressure boundary from the saturated zone. This finding explains the significant dynamic effects for both high- and ultra-low-permeability geomaterial. Therefore, the present full-scale soil column setup with a prepared saturated zone is recommended for academic investigations of dynamic SWRCs.

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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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