地下水位波动下填芯管桩纵向振动特性研究  

Study on Longitudinal Vibration Characteristics of Cored Pipe Pile Under Groundwater Level Fluctuation

作　　者：杨冬英[1] 陈经纬 李学东[2] Yang Dongying;Chen Jingwei;Li Xuedong(College of Civil Engineering,Suzhou University of Science and Technology,Suzhou,Jiangsu 215011,P.R.China;Jiangsu Suzhou Geological Engineering Survey Institute,Suzhou,Jiangsu 215011,P.R.China)

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011 [2]江苏苏州地质工程勘察院,江苏苏州215011

出　　处：《地下空间与工程学报》2023年第4期1389-1400,共12页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(51508369);江苏省自然科学基金(BK20150289)。

摘　　要：根据地下水位波动,研究了填芯管桩与土体受纵向振动荷载下的耦合动力特性。将桩端土视为虚土桩,建立了地下水位波动影响下的土层与填芯管桩的振动方程,并结合边界条件对动力方程解耦求解,得出填芯管桩与土的动力耦合作用频域响应解析解及时域响应半解析解。将管桩退化为实芯桩后与现有实芯桩理论解进行对比,进而再与数值解进行对比。最后,分别分析了地下水位变动、填芯材料及填芯高度对填芯管桩纵向振动特性的影响。结果显示,干土相对于饱和土能更好耗散激振能量;填芯材料性质提高,反射信号幅值增大;填芯高度位置与曲线中反向反射信号位置相对应。According to the fluctuation of groundwater level,the coupling dynamic characteristics of cored pipe pile and soil under longitudinal vibration load are studied.Considering the soil at the pile end as a virtual soil pile,the vibration equation of soil layer and cored pipe pile under the influence of groundwater level fluctuation is established,and the dynamic equation is decoupled and solved in combination with boundary conditions.The analytical solution of frequency domain response and semi-analytical solution of time domain response of dynamic coupling between cored pipe pile and soil are obtained.After the pipe pile is reduced to solid core pile,it is compared with the existing theoretical solution of solid core pile,and then compared with the numerical solution.Finally,the effects of groundwater level change,core filling material and core filling height on the longitudinal vibration characteristics of core filled pipe pile are analyzed.The results show that dry soil can dissipate excitation energy better than saturated soil;With the improvement of the properties of the core filling material,the amplitude of the reflected signal increases;The position of core filling height corresponds to the position of reverse reflection signal in the curve.

关 键 词：填芯管桩 虚土桩 地下水位 动力响应 解析解 

分 类 号：TU473[建筑科学—结构工程]