径向渐变土中低应变测桩的数值计算分析  

Numerical analysis of low strain test of pile in radial gradient soil

作　　者：高子杰 刘东甲[1] 姜静[1] 刘华瑄 柯宅邦[3] 张健[1] 

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009 [2]安徽省地质矿产勘查局313地质队,安徽六安237010 [3]安徽省建筑科学研究设计院,安徽合肥230001

出　　处：《合肥工业大学学报（自然科学版）》2016年第2期233-238,共6页Journal of Hefei University of Technology：Natural Science

摘　　要：文章基于三维轴对称数值计算方法,建立了在桩侧径向土参数(剪切波速和密度)渐变条件下的三维桩土计算模型,计算得到了在瞬态纵向激振力作用下的桩顶理论速度时域曲线,然后对其进行变换得到相应的频域曲线。通过调整不同扰动区域的桩侧径向土的参数渐变范围,发现了在不同土参数(剪切波速和密度)渐变条件下时域曲线的区别以及频域曲线中各阶频率在参数渐变下的一些规律。工程实例的结果表明渐变参数下模型的曲线与实测曲线更为吻合。In this paper, a three-dimensional model of pile-soil under conditions of gradual changing parameters of pile-surrounding soil including the shear wave velocity and density is created based on the three-dimensional axisymmetric numerical calculation method. The theoretical velocity time domain curves of pile top and the frequency domain curves of pile are calculated under the transient vertical excitation force. Through adjusting the gradient parameter range of the surrounding soil in the different disturbance areas, the difference of gradient time domain curves under different soil parameters including the shear wave velocity and density and some rules of each order frequency of frequency domain curves under gradient parameters are found. The result of engineering application shows that the measured curve of low strain integrity is more consistent with the simulation curve under gradual changing parameter model.

关 键 词：三维轴对称 桩土模型 桩侧径向土 时域曲线 频域曲线 

分 类 号：TU473.16[建筑科学—结构工程]