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以黏性土在相同含水率不同干密度下,和相同干密度不同初始含水率条件下,进行核磁共振试验研究。通过核磁共振实验结果,从微观的角度对土体结构进行分析,探究粘黏性土体不同状态对于土体内部微观结构的影响。实验结果表明:密度较低的饱和黏土试样具有更多的大孔隙。干密度对黏土的大孔隙结构有较大影响,而初始含水率会对饱和黏土的小孔隙结构有影响。此外,通过对核磁共振测试和压汞测试的实验结果进行比对,可以看出两种测试手段,在孔隙孔径分布的探究上具有一致性,都可以反映出黏土的微观孔隙结构。
Nuclear magnetic resonance test was conducted under the conditions of different dry densities of clayey soil at the same moisture content and different initial moisture content under the same dry density. Through the results of NMR experiments, the soil structure is analyzed from the microscopic point of view, and the effect of different viscous clays on the microstructure of the soil is explored. The experimental results show that the samples with lower density have more macropores. The dry density has a great influence on the macropore structure of clay, while the initial moisture content will affect the pore structure of saturated clay. In addition, by comparing the experimental results of NMR and mercury intrusion tests, it can be seen that the two test methods are consistent in the study of pore-size distribution, which can reflect the micro-pore structure of clay.