Study the Coefficient of Energy Transfer from Hammer to Pile Driven in Two Layers Foundation Base, Pile Bearing Side Friction q1#q2 Pile Bottom Encounters Constant Resistance

This paper consider the collision of hammer to pile driven into two layers foundation base, piles bearing side friction q1 ≠ q2, applies the theoretical basis of longitudinal collision of elastic bars and method of wave propaganda DAlember, determine the velocity of pile heads in the time interval, compress work of elastic buffering on pile head, from the calculation of coefficient of energy transfer from hammer to pile, choosing pile head buffering and hammer heads according to the coefficient of energy transfer calculated.