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为研究压实黄土土—水特征曲线,采用离心机对不同压实度黄土进行脱水试验。通过调节离心机转速得到不同吸力条件下压实黄土含水量以及重度的变化,将定重度的压实黄土土-水特征曲线和变重度的土-水特征曲线进行分析比较,得出不同压实度黄土土-水特征曲线的变化规律。结果表明:离心试验过程中土样重度随吸力增大而增加,其变化过程分为快速增大、慢速增大和基本稳定3个阶段,土样的重力含水量随基质吸力的逐渐增大而减小,在相同的含水量下,基质吸力随着压实度的增加而增大;考虑重度变化且吸力高于6 bar各组不同压实度试样土—水特征曲线基本重合,而并非未考虑重度土-水特征曲线的平行关系,因此测定压实黄土土—水特征曲线必须考虑重度的变化。
To study the soil-water characteristic curve of compacted loess, centrifuges were used to carry out dehydration tests on loess with different compaction degrees. By adjusting the centrifuge speed to obtain the water content of compaction loess with different suction conditions and the change of gravity, the soil-water characteristic curve of compacted loess and the soil-water characteristic curve of variable gravity are analyzed and compared, Variation of Soil - Water Characteristic Curve of Degree. The results show that the soil samples’ heavy degree increases with the increase of suction force during the centrifugal test. The variation process is divided into three stages: rapid increase, slow increase and basic stability. The gravity water content of soil samples increases with the matrix suction Decreases with the same water content, the matrix suction increases with the increase of compaction degree. Considering the severe change and the suction higher than 6 bar, the soil-water characteristic curves of different compaction samples in each group basically coincide, Without considering the parallel relationship between the heavy soil-water characteristic curves, the determination of the compacted loess soil-water characteristic curve must take into account the severe changes.