中文摘要：

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。

英文摘要：

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.