大吸力范围内红土粘土微观结构对保水性能的影响

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL Geomechanics and Engineering Pub Date : 2021-01-01 DOI:10.12989/GAE.2021.25.5.417
Jin Pan, Zhen Wenzhan, Bo Chen, De’an Sun, You Gao, Y. Xiong
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引用次数: 1

摘要

为了研究土结构和干密度对大吸力范围内红土粘土保水特性的影响,采用轴向平移技术(ATT)、滤纸技术(FPT)和蒸汽平衡技术(VET)相结合的方法,获得了不同结构和干密度下红土粘土的土-水保持曲线(SWRCs)。实测swrc表明,未扰动试样的空气入口值(AEV)和下降梯度(饱和度与吸力关系)最小,预固结试样最大。不同干密度压实试样的SWRCs结果表明,随着干密度的增加,AEV和饱和度-吸力关系的下降梯度增大。在高吸力条件下,土体结构和干密度对保水性能的影响可以忽略不计,不同结构和干密度的试样在极限吸力条件下的重力含水率(w)和吸力(s)曲线吻合证明了这一点。此外,汞侵入孔隙度法(MIP)得到的孔隙尺寸分布(psd)可以很好地说明水潴留行为。aev依赖于相应的直径,这对应于微分侵入空隙比的急剧增加。饱和度-吸力关系的下降梯度取决于其不同的PSD范围和优势孔径的增量峰值。此外,从psd和SWRC推断出的AEVs和极限吸力的一致性表明,psd高度依赖于psd,并且psd可以很好地捕捉SWRC特征。
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Effect of microstructure on water retention behavior of lateritic clay over a wide suction range
To investigate the effects of soil structrue and dry density on water retention behavior of lateritic clay over a wide suction range, the axial translation technique (ATT), filter paper technique (FPT) and vapour equilibrium technique (VET) were combined to obtain soil-water retention curves (SWRCs) of specimens with different structures and dry densities. Measured SWRCs indicate that the air-entry value (AEV) and descent gradient in terms of saturation degree versus suction relationship are smallest for undisturbed specimens, and are largest for pre-consolidated specimens. The SWRCs obtained from compacted specimens with different dry densities illustrate that the AEV and descent gradient of saturation degree versus suction relationship increase with increasing the dry density. However, the effects of soil structure and dry density on the water retention behavior can be negligible at high suctions, which are verified by the curves of gravimetric water content (w) verusus suction (s) coincided after a limiting suction for specimens with different structures and dry densities. In addition, the water retention behavior can be well illustrated by pore size distributions (PSDs), obtained from mercury intrusion porosimetry (MIP). The AEVs depend on the diameters that corresponding to dramatically increase in differential intruded void ratio. And the descent gradients in the saturation degree versus suction relationship depend on their distinct PSD ranges and incremental peaks in the dominant pore sizes. Furthermore, the consistences of the AEVs and limiting suctions, deduced from the PSDs and SWRCs, demonstrate that the water retention behavior is highly dependent on the PSDs, and the SWRC features can be captured well by the PSDs.
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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