An analysis on the nature of CASE method and on the cause of underestimated pile load capacity by this method

CASE method was claimed by its inventor as a closed form solution of the wave equation.However,the ultimate bearing capacity of single piles predicted by CASE method was much lower than that determined by static load test.The rationality of the assumption of CASE method ,the possibility of the establishment of its formulas,the causes of underestimating the bearing capacity, as well as the way to improve the method are analysed and suggested according to the wave theory in this paper.