打桩过程中桩的横向振动分析

An Approach to Analyzing the Transverse Vibration of a Pile during Pile Driving

利用 Winkler地基土模型对锤击法沉桩时层状地基中的预制桩建立了合理的力学模型。经过动力分析 ,给出了单桩在桩顶偏心动力竖向荷载作用下动力响应的数值解 ,并分析了激振强度、桩径、土对桩的水平地基反力系数以及土的粘滞阻尼系数等对桩动力响应的影响。为研究桩在强烈轴向和弯矩激振共同作用下的响应提供了初步的分析方法 ,特别对预制钢筋混凝土桩的设计和施工具有指导意义。

An approach to analyzing the transverse vibration of a pile during pile driving is presented in the paper, in which the pile is modeled as a beam based on Winkler soil foundation, and the driving force is eccentrically acted on pile top. Effects of exciation intensity and impact duration of pile hammer, diameter or length of side of pile, eccentricity of pile hammer, foundation modulus and coefficient of viscosity of soil on the dynamic response of pile are analyzed. It is found that only the change of foundation modulus of soil can not efficiently affect the transverse vibration and the dynamic shear force and moment. The result is meaningful to efficient driving of precast concrete piles.