A NMR-based analysis of drying processes of compacted clayey sands

作者：Tian Hui Hui; Wei Chang Fu^*; Wei Hou Zhen; Chen Pan; Cheng Fang Quan

来源：Yantu Lixue/rock and Soil Mechanics, 2014, 35(8): 2129-2136.

• Compacted soil
• Distribution curves
• Drying characteristics
• Initial Moisture Content
• Nuclear magnetic resonance(NMR)
• Pore-size distribution
• Spin-spin relaxation time
• Water retention

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.

• 出版日期2014-8-10
• 单位岩土力学与工程国家重点实验室