| 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(): |
| 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 |
| 投稿时间：2023-07-17 修订日期：2023-11-18 |
| DOI： |
| 中文关键词: 非饱和红黏土 压实样 持水曲线 粒径尺寸 孔径分布 |
| 英文关键词: Unsaturated lateritic clay Compacted specimens Aggregate size Water retention Curve Pore size distributions |
| 基金项目:浙江省自然科学基金项目；衢州市重点科技攻关资助项目 |
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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的试样，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，孔径分布曲线可有效预测土体对应吸力下的含水率，测定饱和度却低于实测的饱和度。研究成果可为红黏土填料的粒径尺寸选用提供参考。 |
| 英文摘要: |
| To investigate the effect of aggregate size on the water retention characteristics and pore size distributions (PSDs). The water retention curves measurement and mercury intrusion porosimetry (MIP) over a wide suction range, were conducted on lateritic clay specimens with different aggregate sizes by axial translation techniques (ATT)and vapor equilibrium techniques (VET). The obtained water retention curves and PSDs from tests, the mechanism of aggregate size effect on the water retention characteristic was reveal in this clay. The key findings are as follow. (1) The aggregate size only has great effect on the water retention curve in the low suction range, and the air-entry value is higher for specimen with smaller aggregate size. (2) The PSDs are unimodal for the saturated compacted specimens with different aggregate size, and the higher peak and narrower concentrated pore distributions are observed in the PSDs of specimens with smaller aggregate size. The above-mentioned results demonstrated that the pore is more uniform for the specimen with smaller aggregate size. (3) The predicted curves of gravimetric water content versus suction from PSDs are consistent with the measured test results, which means that the it is convenient and effective to predict soil water retention characteristic from PSDs. However, the predicted saturation degree is lower than the measured saturation degree in the same suction, due to the neglection on the reduction of void ratio of specimen during the drying. The obtained research results provide the support toto select the aggregate size in the lateritic-filling in the engineering. |
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