Study on Nuclear Magnetic Resonance Characteristics of Simulated Capillary
Nuclear magnetic resonance has been widely used in geotechnical engineering,but there is still a lack of experimental support for the conversion relationship between the lateral relaxation time T2 and the pore radius r of the medium.Polytetrafluoroethylene pipes with three different pore sizes were used to simulate soil capillary,and the T2 curves of the capillary under different pore sizes and pore volumes were measured.Finally,the relationship between the characteristic parameters of the T2 curve and the pore radius and pore volume was analyzed in detail.The results show that the T2 curve can well reflect the water content and the storage state of pore water in soil.A good linear relationship between water content and integral area of T2 curve is also observed,and a positive proportional relationship between pore radius r and T2 value is found.These conclusions provide a useful reference for the study of porous medium and storage state of pore water based on nuclear magnetic resonance.
nuclear magnetic resonancecapillaryT2 curvepore radius
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