| 陈波,赵辛金,徐伟皓.粒径尺寸对红黏土持水曲线及孔径分布影响研究[J].安徽建筑大学学报,2024,32(2):1-6 |
| 粒径尺寸对红黏土持水曲线及孔径分布影响研究 |
| Effect of Aggregate Size on Water Retention Curve and Pore Size Distribution of Lateritic Clay |
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| DOI： |
| 中文关键词: 非饱和红黏土 压实样 粒径尺寸 持水曲线 孔径分布 |
| 英文关键词: unsaturated lateritic clay compacted specimen aggregate size water retention curve pore size distribution |
| 基金项目:浙江省自然科学基金项目（LZY21D020001）；衢州市重点科技攻关资助项目（2022K93、2023K220） |
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| 中文摘要: |
| 为探究粒径尺寸对红黏土的持水特性及孔径分布的影响，用轴平移技术和蒸汽平衡技术对不同粒径尺寸制备的红黏土压实样开展广吸力范围内的持水特性试验和压汞试验，基于不同粒径尺寸试样的持水曲线和孔径分布曲线，揭示粒径尺寸影响土体持水特性的细观机理。具体结论如下：（1）粒径尺寸只对压实样在低吸力范围的持水曲线产生影响，表现为粒径尺寸越小，制备试样进气值则越大。（2）不同粒径制备的饱和压实样均为单峰型孔隙结构，且粒径尺寸越小，制备试样的集中孔径分布的峰值越高，分布的范围也越小，表明粒径越小的试样的孔径分布越均匀。（3）预测和实测持水曲线的比较结果显示，由于无法考虑土体干化路径下的孔隙比减小，孔径分布曲线可用于预测土体在对应吸力下的含水率，测定饱和度却低于实测的饱和度。 |
| 英文摘要: |
| To investigate the effect of aggregate size on water retention characteristics and pore size distributions (PSDs), the waterretention curves measurement and mercury intrusion porosimetry (MIP) over a wide suction range, were conducted on lateritic clayspecimens with different aggregate sizes by axial translation techniques (ATT) and vapor equilibrium techniques (VET). The waterretention and PSD curves were obtained to explore the microscopic mechanism by which aggregate size affects water retention in soil.The results showed that aggregate size only had great effect on the water retention in the low suction range, and the air-entry value washigher for specimen with smaller aggregate size, and the smaller the aggregate size dimension, the larger the inlet value of thespecimen. The PSDs were unimodal for saturated compacted specimens with different aggregate sizes. It was found that the smalleraggregate size of the specimen, the higher the peak of the concentrated PSD, and the narrower the distribution range, which means thesmaller the particle size, the more uniform the pore size distribution. The comparison of predicted and measured water retention curvesproved that due to the neglection on the reduction of void ratio of specimen in drying process, the PSD curve could predict be used topredict the water content with different suctions, while the predict saturation was lower than the measured result. |
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