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应用动力方法去检测桩基的承载能力是人们十分感兴趣的问题,近百年来,动力打桩公式就是在打桩过程中预测桩基承载力的理论基础,它以在简化假设的碰撞过程中两个刚体之间的锤击能量(=锤重×落高)和贯入所做的功(贯入阻力×贯入深度)两者平衡为基础,但由于动力打桩公式利用打桩系统的参数很少(主要是锤击贯入度参数),当要考虑桩土系统的弹性变形以及动贯入阻力与桩承载力之间的差异等问题时,其测试计算结果难以令人满意,为此,人们曾致力于修改动力打桩公式,以求得较好的应用效果。
The application of the dynamic method to detect the bearing capacity of the pile foundation is of great interest. In the past 100 years, the dynamic piling formula is the theoretical basis for predicting the bearing capacity of the pile foundation in the pile driving process. The balance between hammering energy (=hammer weight x falling height) and penetration work (penetration resistance× penetration depth) between rigid bodies is based on the balance, but there are few parameters due to the dynamic piling equation using the piling system (mainly It is the hammer penetration parameter. When the problems of the elastic deformation of the pile-soil system and the difference between the dynamic penetration resistance and the bearing capacity of the pile are considered, the results of the test calculation are unsatisfactory. Therefore, people have dedicated To modify the dynamic driving formula to obtain better application results.