Abstract:Taking the typical engineering accumulation of urban construction and transportation hub project in Chongqing as case study, the infiltration characteristics, influencing factors and suitability of infiltration model were explored by using field double-ring infiltration, and the best infiltration model of typical engineering accumulation in Chongqing was filter out. The results indicated that:(1) The initial infiltration rate of engineering accumulation was 23.20 mm/min. The infiltration rate decreased gradually with time, and the 30 min-infiltration rate was 2.38~11.32 mm/min and the stable infiltration rate was 1.81~9.05 mm/min; (2) The initial infiltration rate, stable infiltration rate, average infiltration rate, 30 min-infiltration rate, 60 min-infiltration rate, and total infiltration of each engineering accumulation showed medium variation and the coefficient variation was 36.42%~57.49%; (3) The initial infiltration rate, stable infiltration rate, average infiltration rate, and total infiltration of engineering accumulation had negative correlations with soil bulk density and soil water content, while positive correlations with total soil porosity existed. The stable infiltration rate, average infiltration rate, and total infiltration of engineering accumulation had negative correlations with 60~40, 40~20, 20~10, 10~5 mm gravel content and had positive correlations with 5~2 mm gravel content; (4) There were differences in the fitting effect of the regression models with different engineering accumulations and the ranking of R2 from high to low was:Kastiakov model (0.899) > common empirical infiltration model (0.893) > Horton model (0.870) > Philip model (0.867). The fitting effect of Kastiakov model was better than the common empirical infiltration model, Philip model and Horton model, and which could be used to simulate and predict the infiltration process and infiltration capacity of engineering accumulation in Chongqing.