针对高聚物注浆修复堤坝面板脱空病害的修复效果问题,依据实际堤坝面板层间结构和材料介电参数,基于时域有限差分法和完全匹配层边界条件建立了高聚物注浆修复面板脱空堤坝的探地雷达电磁波计算模型,分析了雷达中心频率、面板脱空修复程度及脱空区域大小、面板厚度及配筋等因素对高聚物注浆修复面板脱空堤坝探地雷达波场特征的影响.结果表明:随着激励源中心频率增大,探地雷达剖面图分辨率逐渐增加;随着脱空区域长度增加,探地雷达剖面图中产生的水平状界面反射波增长;随着脱空区域深度增加,探地雷达剖面图水平状反射线之间时间间隔逐渐增大;随着堤坝面板厚度增加,在面板脱空修复区域绕射波和衍射波幅值减小;探地雷达发射的电磁波遇到钢筋时将产生能量较强的绕射波,强绕射波将脱空区域上下分界面的反射波分割开,难以判断反射波的水平长度.根据高聚物注浆修复面板脱空堤坝的探地雷达波场特征,能有效判断堤坝面板脱空区域的高聚物注浆修复效果,有助于解释实际堤坝面板高聚物注浆修复效果的探地雷达图像.
In view of the effect of polymer grouting in repairing the dam face disengaging,the ground penetrating radar wave field of the dam face disengaging was studied.A calculation models of the dam with panel disengaging repaired by polymer grouting was established based on the finite-difference time-domain method and the perfectly matched layers boundary conditions.The effects of radar center frequency,degree of panel disengaging repair,size of disengaging area,face thickness and reinforcement on ground penetrating radar(GPR)wave field characteristics of the dam face disengaging repaired by polymer grouting were analyzed.The results showed that the resolution of GPR profile increased gradually with the increase of the excitation source center frequency.The horizontal interfa-cial reflection wave generated in the GPR profiles increased with the length of the disengaging area.The time inter-val between horizontal reflectors on the GPR profiles increased with the depth of the disengaging area.The ampli-tudes of the bypassed and diffracted waves in the disengaging repair area decreased with the increase of the dam face thickness.The electromagnetic waves emitted by the GPR encountered the steel reinforcement and generated a wave field.The reflected waves at the upper and lower interfaces of the disengaging area were divided by the strong bypass waves,which made it difficult to judge the horizontal length of the reflected waves.
方宏远;董智峰;薛冰寒;雷建伟
郑州大学 黄河实验室,河南 郑州 450001||郑州大学 国家地方重大基础设施检测与修复技术联合工程实验室, 河南 郑州 450001
水利科学
堤坝;高聚物注浆;时域有限差分法;面板脱空;探地雷达;波场特征
dams;polymer grouting;finite-difference time-domain;face disengaging;ground penetrating radar;wave field characteristics
《郑州大学学报（工学版）》 2024 (003)
基于比例边界等几何方法的高聚物防渗墙与堤坝土体相互作用机理研究
1-6,13 / 7
国家自然科学基金资助项目(52109169);中国博士后面上基金资助项目(2021M702951);河南省自然科学基金资助项目(212300410279)
10.13705/j.issn.1671-6833.2023.06.012
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