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To investigate the phenomenon and infiltration behavior of non-orthogonal rainfall infiltration into the surfaces of unsaturated sand slopes, a series of model tests of unsaturated sand slopes under different rainfall intensity, slope angle, and void ratio were carried out with a self-designed artificial rainfall device. For the purpose of contrast with the test results, a large amount of the numerical simulations was also conducted using classic methods for treating normal component of rainfall as infiltration boundary condition. Comparisons of the results of numerical simulation and of the tests indicate that there are differences which show that the orthogonal infiltration condition is unsuitable for analysis of rainfall induced seepage in unsaturated slopes.

Experimental researches and numerical analyses of non-orthogonal rainfall infiltration on the surfaces of unsaturated sand slopes