单桩冲击特性模型试验研究与理论分析  

Model Experiment and Theoretical Analysis of Impact Characteristics of Single Pile

作　　者：闫成彧[1] 李强 傅建杰 胡玲 李鑫燚 黄柳青 Yan Chengyu;Li Qiang;Fu jianjie;Hu Ling;Li Xinyi;Huang Liuqing

机构地区：[1]浙江宏宇工程勘察设计有限公司,浙江舟山316100 [2]浙江海洋大学海工学院,浙江舟山316022

出　　处：《辽宁省交通高等专科学校学报》2021年第1期1-4,共4页Journal of Liaoning Provincial College of Communications

基　　金：浙江省舟山市科技计划项目(2020C11038);辽宁省自然科学基金资助(20180551140)。

摘　　要：单桩冲击特性研究是基桩高应变检测技术和打桩工程的理论基础。本文首先通过基桩模型试验方法研究了在不同荷重和落距的冲击荷载作用下的单桩贯入度、桩身轴力和桩侧摩阻力特性,然后采用弹性动力学方法建立了桩土滑移条件下单桩在冲击荷载作用下的动力模型,获得了桩身轴力的解析解,计算结果表明理论解与模型试验结果能较好的吻合,说明不考虑滑移的完全黏结模型过高的估计了桩土间的摩阻力,桩土滑移模型可以更好地模拟单桩的冲击作用。The impact characteristics of a single pile is the theoretical basis for the high-strain detection technology of piles and pile driving.Firstly,a series of pile model experiments are conducted to study the characteristics of single pile penetration,axial force and friction of pile under impact loads of different rammer loads and falling distances.Then,the dynamic model of single pile under impact load under the condition of pile-soil slippage was established by using the elastic dynamic method,and the analytical solution of the pile axial force was obtained.The results show that the theoretical solution is in good agreement with the model test results.This shows that the completely bonded model without considering slippage overestimates the frictional resistance between the pile and soil,and the pile-soil slippage model can better simulate the impact of a single pile in sand.

关 键 词：单桩 冲击荷载 模型试验 桩土滑移 轴力 

分 类 号：TU473.1[建筑科学—结构工程]