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采用滤纸法和压力板法测定不同含盐量盐渍土的土-水特征曲线(SWCC),探讨土中含盐量对盐渍土土-水特征曲线的影响。试验结果表明,粉土中含盐量对基质吸力土-水特征曲线的影响不大。采用滤纸法测得的总吸力与基质吸力之间的差值随着土中盐溶液浓度的增加而增加,且该差值要大于相同浓度纯盐溶液的渗透吸力,其原因是由于土颗粒表面对溶液吸附作用引起的,用滤纸法测得的基质吸力土-水特征曲线处于脱湿曲线和吸湿曲线之间。采用蒸汽平衡法测定Whatman 42号滤纸在高吸力阶段的总吸力的率定曲线,使得高吸力时用滤纸法测定吸力更为精确。
The soil-water characteristic curves (SWCC) of saline soil with different salinities were measured by filter paper method and pressure plate method, and the influence of soil salt content on soil-water characteristic curve of saline soil was discussed. The experimental results show that the salt content in silt has little effect on the soil-water characteristic curve of soil suction. The difference between total suction and matrix suction measured by filter paper method increases with the increase of saline concentration in soil, and the difference is greater than the osmotic suction of pure salt solution of the same concentration. The reason is that the surface of soil particles Absorption of the solution caused by the filter paper method measured by the matrix suction soil - water characteristic curve between the desorption curve and the hygroscopic curve. The steam equilibrium method was used to determine the rate curve of the total suction of Whatman # 42 filter in the high suction stage so that the suction force was more accurately measured by filter paper method under high suction.