| 压实黏质砂土脱湿过程影响机制的核磁共振分析 |
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| 引用本文： | 田慧会,韦昌富,魏厚振,陈 盼,程方权.压实黏质砂土脱湿过程影响机制的核磁共振分析[J].岩土力学,2014,35(8):2129-2136. |
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| 作者姓名： | 田慧会 韦昌富 魏厚振 陈 盼 程方权 |
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| 作者单位： | 1.中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，武汉 430071； 2.长江岩土工程总公司，武汉 430071 |
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| 基金项目： | 国家自然科学基金项目（No. NSFC #11072255）；中国科学院重要方向性项目（No. #KZCX2-YW-JS108）；广西自然科学基金重点项目（No. 2011GXNSFE018004）。 |
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| 摘 要： | 通过对具有不同初始含水率和干密度的两种压实黏质砂土的脱湿曲线进行测试、分析和对比,并结合核磁共振技术,探讨了干密度、初始含水率和土样组分对压实黏质砂土脱湿过程的影响规律。利用核磁共振测得了试样在各级吸力下的T2时间(横向弛豫时间)分布曲线,定性地探讨了不同吸力下试样中的水分分布特征,揭示了干密度、初始含水率和土样组分对试样脱湿过程的微观机制影响。试验结果表明:干密度仅在低基质吸力条件下对试样脱湿过程产生重要影响,而在高吸力条件下初始含水率和试样组分起主导作用;核磁共振结果证实在压实黏质砂土中,小孔隙结构主要由初始含水率和试样组分控制,而大孔隙的结构主要取决于干密度;试样组分对压实土的内部结构和孔隙大小分布的影响比初始含水率大。
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| 关 键 词： | 核磁共振 压实土 脱湿特性曲线 T2分布曲线 持水性 |
| 收稿时间： | 2013-04-22 |
A NMR-based analysis of drying processes of compacted clayey sands |
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| TIAN Hui-hui,WEI Chang-fu,WEI Hou-zhen,CHEN Pan,CHENG Fang-quan.A NMR-based analysis of drying processes of compacted clayey sands[J].Rock and Soil Mechanics,2014,35(8):2129-2136. |
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| Authors: | TIAN Hui-hui WEI Chang-fu WEI Hou-zhen CHEN Pan CHENG Fang-quan |
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| Institution: | 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. Changjiang Geotechnical Engineering Corporation, Wuhan 430071, China |
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| Abstract: | Drying characteristic curves for two compacted clayey sands with different dry densities and initial moisture contents were measured, analyzed and compared. Based on the nuclear magnetic resonance (NMR) measurements, the effect of dry density，initial moisture content and soil composition on the drying characteristics of the compacted soils was investigated. The T2 (spin-spin relaxation time) distribution curves at various suctions were measured and used to characterize the moisture distributions in the soils, and the effect of the dry density，initial moisture content and soil composition on the drying process of the compacted soils were analyzed. The results show that the effect of dry density on the drying process is significant only at low matric suction, and for the soils with high matric suction, the effect of the initial moisture content and soil composition becomes important; based on the analysis of the NMR measurements, it is also shown that in compacted clayey sands, the structure and content of micropores are mainly determined by the initial moisture content and soil composition, whereas those of macropores are controlled by the dry density; soil composition has more significant influence on the internal structure and pore-size distribution of compacted soils than initial moisture content. |
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| Keywords: | nuclear magnetic resonance compacted soil drying characteristic curve T2 distribution curve water-retention characteristic |
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