| 陈波,徐伟皓,江鸿.两种非饱和原状土的持水曲线及孔径分布[J].安徽建筑大学学报,2023,31(4):1-7 |
| 两种非饱和原状土的持水曲线及孔径分布 |
| The Water Retention Curves and Pore Size Distributions of Two Unsaturated Natural Soils |
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| DOI： |
| 中文关键词: 非饱和土 持水特性 全吸力范围 孔径分布 持水曲线预测 |
| 英文关键词: unsaturated soil water retention behaviors entire suction range pore size distribution water retention curve prediction |
| 基金项目:浙江省自然科学基金项目（LZY21D020001）；浙江省交通运输厅科技计划项目（2021044）；衢州市重点科技计划项目（2022K93） |
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| 中文摘要: |
| 分别用轴平移技术和蒸汽平衡技术对原状黄土和红土施加低吸力（s ≤ 1.5 MPa）和高吸力（s ＞ 1.5MPa），量测土体在不同吸力下的含水率和孔隙比，得到两种土体在广吸力范围内的持水曲线与基本参数(进气值、残余吸力值和过渡段曲线斜率 )。开展土体孔径分布测定试验，揭示两种土体的水力特性存在明显差异的微观机理。最后，基于土体脱湿过程与汞压入过程基本一致的原理，利用孔径分布曲线对土体的持水曲线进行预测。研究结果表明：①黄土持水曲线的过渡段由 3 段不同斜率的直线所构成，为双峰型持水曲线。红土持水曲线的过渡段由单一斜率线段构成，为单峰型持水曲线；②黄土的孔径分布曲线为双峰孔径结构，且大孔径集中分布的峰值大于小孔径集中分布的峰值。红土的孔径分布曲线为单峰孔径结构，且孔径在设备的可探测范围内均有一定量的分布；③利用孔径分布曲线预测的含水率与吸力关系与实测结果基本吻合，表明孔径分布曲线可较为有效预测土体的持水特性。 |
| 英文摘要: |
| The axial translation technique (ATT) and vapor equilibrium technique (VET) were applied on the undisturbed loess andlateritic clay with the low suctions (s ≤ 1.5MPa) and high suctions (s ＞ 1.5 MPa) to obtain their water retention curves in an entiresuction range，and the corresponding basic parameters （air-entry value，residual suction，slope at transition zone） of the curves.Moreover，the pore size distributions (PSDs) were obtained from mercury intrusion porosimetry (MIP)，to investigate the effect ofmicrostructure on the water retention behaviors of soils. Finally，considering that the mercury intrusion into a porous medium is similarto air injection into a saturated soil，the water retention curves were predicted using the pore size distribution curve. The results showthat the water retention curve of loess is bimodal，and its transition zone is composed of three different gradient lines，while the curveof lateritic clay is unimodal，as its transition zone has only one gradient line. The PSDs of loess is bimodal，and the peak of macropores is higher than that of micro-pores in the dominant pore size distributions. However，the PSDs of lateritic clay is unimodal，withthe pore distributed within the detectable range of the MIP. The consistencies of predicted and measured gravimetric water content versussuction demonstrate that the PSDs can be well adopted to predict the water retention curves of soils. |
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