晋南非饱和土土水特征曲线研究

Research on Soil-water Characteristic Curve of Unsaturated Soil in Jinnan

土水特征曲线对于研究非饱和土的水力与力学特性有着重要作用,采用晋南某Q3黄土进行非饱和固结试验,测试土体基质吸力随含水率及荷载的变化规律,试验结果表明:对于原状黄土及重塑黄土,随着竖向荷载的增大,土体更加密实均匀,虹吸现象更显著,基质吸力略微增大;原状黄土与重塑黄土基质吸力增量并不会随着荷载的增大而呈无限增大,而是存在一个临界值,与实际情况相吻合;原状黄土具有结构性,在较大竖向荷载下土体才被压实得更均匀,基质吸力增量才会达到最大值。

The soil-water characteristic curve is important for studying the hydraulic and mechanical properties of unsaturated soil. The Q3 loess in Jinnan was used to carry out the unsaturated consolidation experiment to test the variation law of soil matric suction with the water content and the load. The test results showed that, for original loess and remolded loess, with the increase of the vertical load, the soil was more dense and uniform, the siphonage was more significant, and the matric suction slightly increased, and their matric suction increment did not increase infinitely with the increase of the load, but there was a critical value, which was consistent with the actual situation. The original loess is structural, so its soil mass can be compacted more uniformly under a larger vertical load, and its matric suction increment would reach the maximum.