高桩低应变测试的交错网格有限差分法响应分析  

Response Analysis of Low Strain Test of Elevated Pile Using Staggered Grid Finite Difference Method

作　　者：姜静 卢志堂[2] 高子杰 JIANG Jing;LU Zhitang;Gao Zijie(Xuancheng Vocational and Technical College,Xuancheng 242000,China;School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China;Anhui Transport Consulting&Desing institute Co.,LTD,Hefei 230022,China)

机构地区：[1]宣城职业技术学院电大工作处,安徽宣城242000 [2]合肥工业大学资源与环境工程学院,安徽合肥230009 [3]安徽省交通规划设计研究总院股份有限公司,安徽合肥230022

出　　处：《安徽建筑大学学报》2021年第1期38-43,共6页Journal of Anhui Jianzhu University

基　　金：安徽省高校自然科学研究重点项目(KJ2020A1012);宣城职业技术学院科研振兴计划提升项目(ZXTS201806);安徽广播电视大学青年项目(QN201907);安徽省住房城乡建设科学技术计划资助项目(2018YF-010)。

摘　　要：为了研究应力波在高桩中传播的三维效应,建立了桩土系统的轴对称模型。运用交错网格有限差分法编制了计算程序并得到了高桩的数值计算结果,通过将该计算结果与高桩实测曲线进行对比,验证了该数值计算的可行性与可靠性。本文研究了高桩低应变检测的最佳拾振位置、对比了高桩与全埋入桩的区别并分析了外露桩长及桩周土对桩顶有效信号的影响。结果表明:距离桩心0.6R处为最佳拾振位置;高桩与全埋入桩相比,具有明显的入岩(土)信号且桩底反射波幅值较大;除此之外,外露桩长和桩周土剪切波速也对入岩(土)信号及桩底反射波产生了一定的影响。In order to study the three-dimensional characteristics of wave propagation in elevated pile,the three-dimensional axisymmetric model for transient vibration of pile-soil system is presented.The program is compiled by using staggered grid finite difference method.The numerical solution of elevated pile is obtained,and the reliability and feasibility of the numerical computation are verified comparing with measured curve.The optimal sensor location at pile top is studied.The numerical solution of elevated pile is compared with those of pile embedded totally.In addition,the effect of exposed pile length and surrounding soil on vertical velocity at pile top are analyzed.It shows that the position distancing the pile center 0.6R(R is the pile radius)is the optimal sensor location.There is a clear signal when the pile embedded in soil,and the amplitude of reflected wave of elevated pile tip is higher than the reflected wave of pile tip of the pile embedded totally.Apart from those,the exposed pile length and shear wave velocity of surrounding soil have influence on the signal of embedded in soil and reflected wave of pile tip.

关 键 词：高桩 低应变检测 交错网格 有限差分法 三维效应 

分 类 号：TU473.16[建筑科学—结构工程]