Abstract
In the former report, the author suggested a new procedure of the theoretical analysis to estimate the behaviours of a pile foundation under vertical load. Some important problems about the theory and the practical analysis are discussed in this paper. The series of eqations which compose the analytical system is one of the approximate solutions to the fundamental differential equation concerning the frictional resistance on a pile circumference. The appropriateness of assumptions, which are to be used in the analysis-such as the non-linear relation between shear stress and displacement along a pile shaft, and the linear relation between reaction and settlement at the pile tip, is examined by comparing computed values with load test results. Pre-determination of constants, which are to be substitued to thet series of equations, is surely important to obtain reasonable result, but those constants are always variable not only with every change of soil characteristic but also with that of piling process. Some test data available to assume the shear strength along the pile and the modulus of pile-tip displacement are represented to be referred.
