压实黏质砂土脱湿过程影响机制的核磁共振分析
发布时间：2018-11-08 10:44
【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。
[Abstract]:The desiccant curves of two kinds of compacted clay sand with different initial moisture content and dry density were measured, analyzed and compared, and the dry density was discussed by nuclear magnetic resonance (NMR). The effect of initial moisture content and soil sample composition on the dehumidification process of compacted clay sandy soil. The T 2 time (transverse relaxation time) distribution curves of samples under different suction forces were measured by nuclear magnetic resonance (NMR). The water distribution characteristics of samples under different suction forces were discussed qualitatively, and the dry density was revealed. The effect of initial moisture content and soil sample composition on the microscopic mechanism of sample dehumidification. The results show that the dry density has an important effect on the desiccant process only under the condition of low substrate suction, but the initial moisture content and the sample composition play the leading role under the condition of high suction. Nuclear magnetic resonance (NMR) results show that in compacted clay sand, the pore structure is mainly controlled by the initial moisture content and the sample composition, while the macropore structure is mainly determined by dry density. The effect of sample composition on the internal structure and pore size distribution of compacted soil is greater than that of initial moisture content.
【作者单位】： 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;长江岩土工程总公司;
【基金】：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)
【分类号】：TU411
本文编号：2318228
[Abstract]:The desiccant curves of two kinds of compacted clay sand with different initial moisture content and dry density were measured, analyzed and compared, and the dry density was discussed by nuclear magnetic resonance (NMR). The effect of initial moisture content and soil sample composition on the dehumidification process of compacted clay sandy soil. The T 2 time (transverse relaxation time) distribution curves of samples under different suction forces were measured by nuclear magnetic resonance (NMR). The water distribution characteristics of samples under different suction forces were discussed qualitatively, and the dry density was revealed. The effect of initial moisture content and soil sample composition on the microscopic mechanism of sample dehumidification. The results show that the dry density has an important effect on the desiccant process only under the condition of low substrate suction, but the initial moisture content and the sample composition play the leading role under the condition of high suction. Nuclear magnetic resonance (NMR) results show that in compacted clay sand, the pore structure is mainly controlled by the initial moisture content and the sample composition, while the macropore structure is mainly determined by dry density. The effect of sample composition on the internal structure and pore size distribution of compacted soil is greater than that of initial moisture content.
【作者单位】： 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;长江岩土工程总公司;
【基金】：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)
【分类号】：TU411
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