Chen Ren-peng, Wang Shi-fang, Chen Yun-min
Geotechnical Engineering Institute, Dept. of Civil Engineering, Zhejiang University, Hangzhou 310027, China.
J Zhejiang Univ Sci. 2003 Nov-Dec;4(6):683-93. doi: 10.1631/jzus.2003.0683.
Pile drivability is a key problem during the stage of design and construction installation of pile foundations. The solution to the one dimensional wave equation was used to determine the impact force at the top of a concrete pile for a given ram mass, cushion stiffness, and pile impedance. The kinematic equation of pile toe was established and solved based on wave equation theory. The movements of the pile top and pile toe were presented, which clearly showed the dynamic displacement, including rebound and penetration of pile top and toe. A parametric study was made with a full range of practical values of ram weight, cushion stiffness, drop eight, and pile impedance. Suggestions for optimizing the parameters were also presented. Comparisons between the results obtained by the present solution and in-situ measurements indicated the reliability and validity of the method.
桩的可打性是桩基设计与施工安装阶段的一个关键问题。利用一维波动方程的解，在给定锤体质量、垫层刚度和桩阻抗的情况下，确定混凝土桩顶部的冲击力。基于波动方程理论建立并求解了桩端运动方程。给出了桩顶和桩端的运动情况，清晰地显示了动态位移，包括桩顶和桩端的回弹和贯入。对锤重、垫层刚度、落距和桩阻抗的全范围实际值进行了参数研究。还提出了优化参数的建议。将本解得到的结果与现场实测结果进行比较，表明了该方法的可靠性和有效性。
