非饱和膨胀土的土-水特性试验研究

以南宁高速铁路弱膨胀土填筑路堤在干湿循环下,土体非饱和特性的变化规律为依托,采用压力板仪法和滤纸法测试,对南宁重塑非饱和弱膨胀土室内的土-水特性进行了研究,并与现场监测情况进行对比分析。研究结果表明:土体土-水特性在干湿循环下,存在明显滞回效应;滤纸法试验值与现场监测值更为接近,所得方程对路堤土-水特征稳定性预测效果更佳。

Experimental Research on Soil-water Characteristics of Unsaturated Expansive Soil

Replying on change regularity of characteristic of unsaturated expansive soil under dry-wet cycle of weak expansive soil filling embankment of Nanning High-speed Railway, pressure plate extractor method and testing by filter paper are adopted to study soil-water characteristics in remodeled unsaturated weak expansive soil chamber in Nanning, and conduct comparative analysis with in-situ monitoring conditions.Research results show that:there is obvious hysteresis effect in soil-water characteristics of soil mass under dry-wet cycle;test results from filter paper method are closed to the data of in-situ monitoring, so better prediction effect of soil-water stability of embankment can be achieved by the equation obtained by this method.