一种可测定变温下饱和-非饱和土水力学参数的实验装置

为了研究温度对饱和-非饱和土水力参数的影响,根据达西定律,研制了一种变温下饱和-非饱和土水力参数测定装置,该装置包括实验筒、供水与回水系统和数据采集系统。该装置可以获得不同温度下饱和渗透系数、给水度和土壤水分特征曲线、非饱和渗透系数、比容水量和扩散率等参数,进一步可以获得这些参数与温度的数学表达式;该实验装置所用试样大,减少了小试样测试结果的随机性,且测定参数多、自动化程度高,具有推广应用价值。

An experimental device for determining hydraulic parameters of saturated and unsaturated soils under different temperature conditions

In order to study the effect of temperature on the saturated - unsaturated hydraulic parameters, the measurement device for determining hydraulic parameters of saturated - unsaturated soils under variable temperature was developed based on Darcy''s law, which contained test column, water supply and return system, and data acquisition system. The device could obtain the saturated permeability coefficient, water and soil water characteristic curve, and unsaturated permeability coefficient parameters, the water capacity and the diffusion rate at different temperatures. Then, the mathematical expressions of temperature and these parameters could be further obtained. In addition, it was shown that the high automatic degree device had popularization and application value for large samples to reduce the randomness of the small sample and determined the parameters of saturated - unsaturated soils.