桩的刚度计算

Computation of Pile Head Stiffness

现行桩的刚度计算大都假设桩为刚性。当桩较短时，由此带来误差不大，但当桩较长时则与实际情况相差较大。本文提出用分层荷载传递法计算单桩刚度，能方便地考虑桩的可压缩性、分层土的性质和桩截面的变化。本文讨论了桩的刚度随桩长、直径、桩身材料弹性模量的变化影响，并把计算值与实测值进行了比较。结果比较一致。

In mest current methods for computation of pile head stiffness, pile is supposed to be rigid. In this way, the error is small when the pile is short, but it involves a remarkable error when the pile is long.A new method to compute the pile head stiffness with the load transfer method is proposed in this paper. With this method,the compressibility of pile, as well as the property of layered soil and variations of pile section can all be considered conveniently.The variations of pile head stiffness with the variations of pile length, pile diameter and elastic modulus of the material of pile shaft are discussed.The computed results are compared with the measured value satifactorily.