The invention relates to a method for predicting piling force when the end part of a precast
pile encounters boulders. The method comprises the following parameters: the length and
diameter of a piled
pile; the
diameter of the boulder; the dynamic cohesive force, the dynamic
internal friction angle, the effective
internal friction angle, the static soil pressure coefficient, the weight above the underground
water level and the weight below the underground
water level of the soil body around the
pile; pile lengths above and below the underground
water level; the average weight of the soil body in the pile length range according to the effective weight in depth; the resistance of soil around the pile to piling; the average vertical stress, the average
horizontal stress and the average normal stress which are applied to the
lower half part of the boulder; the average
shear strength of the
lower half part of the boulder; resistance of the
lower half part of the boulder to piling; the average vertical stress and the average
horizontal stress are applied to the upper half part; the average normal stress, the average
shear strength and the resistance to piling of the upper half part of the boulder; and piling force when the end of the precast pile encounters boulders. The pile driving force needed when the end of the precast pile encounters boulders can be determined, the construction scheme is determined and adjusted in time, and use is convenient.