Calculation method of pile drivability by vibratory hammer

While the pile was subsiding, because of the effect of dynamic friction around piles, the vibratory acceleration of the pile body was decreased along the depth into soil, and the dynamic friction was increased along the depth into soil. When the vibratory hammer exciting force is greater than the sum of dynamic friction and the pile end resistance,and if the max amplitude at the bottom of the pile is greater than the elastic deformation of the soil, the pile could submerge continuously. Through the method for dividing the pile into unit, we determined the relationship between the friction and acceleration of the pile, calculated the accelerations of different unit, considered the stress wave passed in piles and then got the dynamic friction of the pile in different time. The max amplitude at the end of the pile could be obtained by calculating the vibration acceleration of the unit.