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(1 河北大學(xué)建筑工程學(xué)院， 保定 071002；2 中建三局集團(tuán)有限公司， 武漢 430074)
［摘要］基于河北省某橋梁檢測項(xiàng)目，為研究預(yù)應(yīng)力混凝土橋孔道壓漿質(zhì)量的缺陷，使用沖擊回波法對共計(jì)41個(gè)孔道進(jìn)行了檢測，根據(jù)反射信號(hào)的特性得到孔道內(nèi)壓漿密實(shí)度的狀況。根據(jù)不同壓漿密實(shí)度缺陷邊界面規(guī)則的5種有限元模型，提取時(shí)域數(shù)據(jù)進(jìn)行快速傅里葉變換，擬合出壓漿密實(shí)度和頻率的關(guān)系式，并通過實(shí)際工程數(shù)據(jù)驗(yàn)證了有限元模型的準(zhǔn)確性。針對缺陷分界處相同，缺陷邊界面不規(guī)則的有限元模型，用小波包熵值技術(shù)對時(shí)域數(shù)據(jù)進(jìn)行分析，得出缺陷尺寸的大小。結(jié)果表明：在缺陷邊界面規(guī)則和缺陷邊界面不規(guī)則的工況中，隨著缺陷尺寸的減小，小波包熵值均會(huì)增大，實(shí)現(xiàn)了對缺陷分界處相同，但是缺陷尺寸大小不同的壓漿密實(shí)度工況的區(qū)分，從而可以更加精確地對壓漿密實(shí)度進(jìn)行評估。
［關(guān)鍵詞］沖擊回波法；壓漿密實(shí)度；頻譜分析；小波包熵值；無損檢測
中圖分類號(hào)：TU446 文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)16-0110-06
Detection and analysis of grouting compactness based on frequency spectrum analysis and wavelet packet entropy technology
YANG Changmin1, SHI Chong1, SU Shengxi1, LIU Menggang2
(1 College of Civil Engineering and Architecture, Hebei University, Baoding 071002， China；2 China Construction Third Engineering Bureau Group Co., Ltd., Wuhan 430074， China)
Abstract: Based on a bridge detection project in Hebei province, in order to study the defects of the grouting quality of the prestressed concrete bridge channels, a total of 41 pipelines were tested using the impact echo method, and the grouting density in the pipelines was obtained according to the characteristics of the reflected signals. According to the five kinds of finite element models with different density of defect boundary surface rules, and perform fast Fourier transform on the extracted time domain date to fit the linear relationship between grouting density and frequency. And the accuracy of the finite element model through actual engineering data was verified. Aiming at the finite element models with the same defect boundary and irregular defect boundary surface, the wavelet packet entropy technology was used to analyze the time domain data to obtain the size of the defect. The results show that: in the working conditions of regular and irregular defect boundary surfaces, as the size of the defect decreases, the entropy value of the wavelet packet energy spectrum will increase. The grouting compactness working conditions with the same defect boundary but different size of the defect are distinguished, so that the grouting compactness can be evaluated more accurately.
Keywords:impact echo method； grouting compactness； spectrum analysis； wavelet packet entropy； non-destructive testing
作者簡介：楊昌民，博士，教授，碩士生導(dǎo)師，Email:changmyang@126.com； 通信作者：蘇勝昔，碩士，高級實(shí)驗(yàn)師，Email:476900291@qq.com。
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