基于弹性波的预应力管道灌浆密实度定性检测与分析  

Qualitative detection and analysis for compactness of prestressed concrete duct grouting based on elastic wave

作　　者：代志力 向中富 刘世建 周蕙[3] 罗超 DAI Zhi-li;XIANG Zhong-fu;LIU Shi-jian;ZHOU Hui;LUO Chao(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400060,China;Guangxi Traffic Science Research Institute Co.Ltd,Nanning 530000,Guangxi,China;School of Architecture and Urban Planning,Chongqing Jiaotong University,Chongqing 400060,China)

机构地区：[1]重庆交通大学土木工程学院,重庆400060 [2]广西交通科学研究院有限公司,广西南宁530000 [3]重庆交通大学城市建筑与规划学院,重庆400060

出　　处：《长安大学学报（自然科学版）》2021年第5期77-85,共9页Journal of Chang’an University(Natural Science Edition)

基　　金：交通运输部特大型桥梁灾变安全监测预警与应急管理平台研究项目(2011318223190);重庆市研究生教育创新项目(CYB18168);广西重点研发计划项目(桂科AB18221034)。

摘　　要：为了提高预应力管道灌浆密实度定性检测的精度,针对1片20 m长的模型梁进行预应力管道灌浆密实度定性检测。首先,通过简化建立了弹性波首波在管道中的一维传播模型,提出首波慢度与灌浆密实度之间的线性表达式。然后,根据传播模型浇筑1片20 m长的模型梁,模型梁内含有5根具有不同灌浆密实度的预应力管道;利用弹性波激发与采集装置对模型梁中的预应力管道进行灌浆密实度定性检测,通过循环采样的方式进行数据采样;对采样数据进行数据处理,通过首波位置自动判断算法和最优滤波参数选择方法等手段,得到被检管道的首波慢度。最后,利用首波慢度与灌浆密实度线性公式,计算出被检管道的灌浆密实度,并将结果与设计值进行对比分析。结果表明:弹性波首波慢度与管道灌浆密实度之间呈线性关系;检测结果与设计值之间的相对误差约为5%。所提出的循环采样、首波位置自动判断和最优滤波参数选择等方法,可用于实际的预应力管道灌浆密实度定性检测,提高检测精度。In order to improve the detection accuracy, the prestressed concrete duct grouting qualitative detection around a 20 meters long model beam was researched. Firstly, an one-dimensional propagation model for the first elastic wave in the grouting duct by reasonable simplification was established, then a linear formula for the first elastic wave slowness and duct grouting compactness was proposed. Secondly, according to the propagation model, a 20 meters long model beam which include 5 ducts with different grouting compactness were built. The elastic excitation and acquisition devices were used to detect the duct grouting qualitatively by cycle sampling method. The sampled data, calculated the first wave slowness by first wave position automatic judgment algorithm and optimal filtering parameter selection method were processed. Finally, the linear formula to calculate the duct grouting compactness was used, compare with the result of the design value. The results show that the first elastic wave and the duct grouting compactness are nearly linear relationship, the relative error is 5% more or less. The cycle sampling, first wave position automatic judgment algorithm and optimal filtering parameter selection method can be used to detect the compaction of prestressed concrete duct grouting, and improve detection accuracy. 1 tab, 11 figs, 31 refs.

关 键 词：桥梁工程 预应力混凝土 管道灌浆密实度 定性检测 弹性波首波 

分 类 号：U446.3[建筑科学—桥梁与隧道工程]