In this paper

a great quantity of computation on the pile bearing capacity are made by using the wave equation computer program with successively varying input parameters. The effect of each parameter on the pile bearing is analysed. It is shown that all the parameters can be classified into two groups: the intrinsic parameters held by the pile-soil system and the auxiliary parameters held by the pile-hammer system. The intrinsic parameters

including the quake of soil

the visco damping coefficient

the elastic moduli of pile material

the cross section area and the length of the pile

play the dominant role in the determination of the pile bearing capacity. The auxiliary parameters

including the hammer weight

the hammer fall

the spring constant of the cap-block

the coefficient of restitution of cap-block and pile-cushion

and the efficiency of the hammer

etc.

only influence the curves Ru = ｆ(S) or Ru =ｆ(N) but not change the value of the actual bearing capacity of the pile. From the analysis it is also indicated in the paper that the quake value of the soil

besides the intrinsic parameters held by the pile itself

is the mast influential factor on the pile bearing capacity.