Abstract:In order to find out the main factors affecting the leakage of pressure infiltration channels, the constant water level static water test method was adopted to carry out the leakage test of channels. Eight infiltration heads were set up to explore the change rules of the cumulative infiltration amount and infiltration rate of channels under different water depths, and Hydrus-2D software was selected for simulation analysis. The results showed that the simulated values and measured values were basically consistent. The RMSE values of infiltration rate were 0.003 6~0.376 3 cm/h, and RMSE was 0.001 7~0.300 9 m3 for cumulative infiltration amount, the average of R2 was always more than 0.9, indicating that the soil water movement equation and its related parameters were reasonable, the channel leakage evaluation was feasible. The influence of water depth, bottom width and slope coefficient were analyzed by field expansion test of Hydrus-2D model. The results showed that the change of channel water depth had a great influence on the infiltration rate, while the change of channel bottom width and slope coefficient had a small influence on the infiltration rate. The influence of channel water depth, bottom width and slope coefficient on cumulative infiltration amount was extremely significant (P<0.01), and the degree of influence on cumulative infiltration amount was:channel water depth > channel bottom width > slope coefficient. Among them, the interaction between channel bottom width and slope coefficient had no significant influence on cumulative infiltration amount (P>0.05), but the interaction between channel water depth and slope coefficient had an extremely significant correlation with cumulative infiltration amount (P<0.01), and the interaction between channel water depth and slope width had an equally significant correlation with cumulative infiltration amount (P<0.01). This study could provide a reference for exploring the rule of water infiltration, improving the technology of seepage prevention and developing a new method for calculating leakage loss.