压力膜仪法在测定土壤水分特征曲线中的应用

Application of Pressure Membrane Meter Method to Determination of Soil Moisture Characteristic Curve

对压力膜仪法的工作原理、试验装置及操作方法进行了介绍。利用压力膜仪测定了某区沙土、原位沙、粉沙及黏土4种土壤的水分特征曲线,结果表明:压力膜仪能够同时测定多种土样,但测定周期长、步骤繁琐,存在容重变化问题。

At first,this paper introduces the work principle,test device and operation method of the pressure-membrane meter method.On the basis,water characteristic curves for sandy,situ-sandy,silt and clay soils from deferent regions were determined by pressure-membrane meter.The results show that the operation of pressure-membrane meter is simple and many solid samples can be determined at same time.However,a few problems still remain by pressure-membrane instrument method,such as a long testing period,many steps,variable bulk density,and so on.