桂林雁山红粘土的土-水特征试验

Experiment on Soil-Water Characteristics of Red Clay from Yanshan of Guilin

采用压力板仪对重塑红粘土在不同干密度条件下进行脱湿试验,得到了相应的土-水特征曲线。采用常用的van Genuchten模型、Fredlund 4模型对实测的土-水特征曲线进行了拟合,其拟合结果较好。试验结果表明:干密度越大、进气值越高,试样在相同基质吸力下干密度大的试样含水量更高。将红粘土的土-水特征曲线与干密度非常接近的贵州地区玄武岩红土进行了对比,发现红粘土的持水能力要比其他类型的粘土更强。

Pressure plate apparatus is used to molded red clay at three different dry densities. soil-water characteristic curve of the red clay. ta well. It shows that when the dry density is er at the same matric suction. In comparison clay has better capacity to hold moisture. determine the soil-water characteristic curve of unsaturated re- Model van Genuchten and Model Fredlund 4 are employed to fit The result shows that these models can fit in the experimental da- larger, the air entry is higher and the degree of saturation is high- with basalt red soil of Guizhou at the same dry density, the red clay has better capacity to hold moisture.