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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。
Through testing, analyzing and comparing the desorption curves of two compacted clayey sands with different initial moisture contents and dry densities, combined with the nuclear magnetic resonance technique, the effects of dry density, initial moisture content and soil component pairs Influence laws of dehumidification process on compacted muck soil. The distribution curve of T2 time (transverse relaxation time) under different levels of suction was obtained by using nuclear magnetic resonance (NMR). The distribution characteristics of water in samples with different suction were qualitatively investigated. The dry density, initial moisture content and soil sample Effect of Composition on Microscopic Mechanism of Sample Dehumidification Process. The experimental results show that the dry density has an important influence on the desorption process of the sample only under the condition of low substrate suction while the initial moisture content and sample composition play a leading role under the condition of high suction. In sand, the pore structure is mainly controlled by the initial water content and the sample composition, while the structure of the macropore mainly depends on the dry density. The influence of the sample composition on the internal structure and pore size distribution of compacted soil is better than that of the initial water content Big rate.