摘要
采用FDTD方法,正演分析了单层及多层土体中无缺陷混凝土桩基,以及单层土体中设置有空洞、离析和缩径缺陷的混凝土桩基钻孔雷达响应特征。单层及多层土体中混凝土桩基桩底位置处的同相轴均出现扭曲等情况。圆形空洞反射波同相轴呈现双曲线形特征,方形空洞反射波同相轴呈现前部扁平曲线特征。离析缺陷雷达反射波同相轴特征与圆形空洞同相轴类似,但同相轴滞后。缩径处的反射波同相轴特征与方形空洞的同相轴特征相似,但缩径位置与天线位置的变化会导致同相轴滞后。
Geometric effects of model piles located in surrounding soils with same /various dielectric constant,with /without hole,concrete segregation and pile necking detected by borehole radar,were simulated with finite time domain( FDTD) method. And the response shows that lineups were distorted at the bottom of the pile. The lineups at the depth of the circle-like hole in model pile were distorted in shape of hyperbola,while for the rectangle-like one,they became a near-flat surface. The response of concrete segregation was like the one of circle-like hole,but the lineups were delayed at the depth with concrete segregation. As to the pile with necking,its response was like the one with rectangle-like hole in it,but the lineups would be delayed as the distance between the necking and the borehole radar antenna was changed.
出处
《地下空间与工程学报》
CSCD
北大核心
2013年第S1期1568-1573,共6页
Chinese Journal of Underground Space and Engineering
基金
交通运输行业重点实验室应用基础研究项目(2012-319-223-020)
交通运输建设科技项目(2007-318-223-30
2011-318-223-1390)
关键词
钻孔雷达
时域有限差分
形状效应
混凝土桩
空洞
离析
缩径
borehole radar
finite difference time domain
geometric effect
concrete pile
hole
concrete segregation
pile necking
