Research On Detection Technology Of Anchoring System The Plumpness Of Mortar Quality

With the highway construction, tunnel and slope supporting engineering appeared in large numbers, the number of applications of bolt has doubled. However, the anchor bracing engineering belongs to the concealed construction, affecting the supporting quality affected by geological conditions, construction technology and human factors, likely to cause subtle problems, causing great economic losses caused by engineering accident. Therefore, it is necessary to test the anchorage quality, supporting engineering safety.With the development of anchorage quality detection technology, the detection method also emerge in an endless stream, is one of the most widely used method of stress wave, its main advantage is that it can fully reflect the construction quality of anchor system fast, nondestructive, accurate. But it also has many problems, mainly:the theory of sound propagation regularity is not perfect in the anchoring system; the anchor end reflection signal can not effectively identify defects and anchor system; anchorage mortar plumpness inaccurate test results.At present, domestic and foreign researchers mainly bolt will focus on the first two issues, and has made certain achievements, but ignore the third problems, and is also the most important one. The article tries to analyze the third issues of related research, in the method of combination of time-frequency analysis method of anchor system mortar plumpness detection signal processing anchor, a study on the relationship between the time-frequency response and anchoring defect.In order to better relationship research on detection signal time-frequency response and anchor defects, made five bolt models, respectively four PVC root canal model of bolt and 1 simulated on-site construction and design of anchor bolt, various defects, with the relevant procedures in the MATLAB assembly language platform to compile the joint time-frequency analysis methods. Through the signal acquisition of different model of anchor, the paper applies empirical mode Hilbert transform, short-time Fourier transform, Wigner-Ville distribution and Hilbert-Huang transform in the decomposition method of joint time-frequency analysis, the time-frequency distribution of different anchoring state, then compared with the design parameters of model bolt.In the model of bolt in signal processing, signal analysis firstly the characteristic of Hilbert transform using the model of bolt detection signal, frequency analysis of frequency analysis of the application of short-time Fourier transform, Wigner-Ville distribution, get the time-frequency distribution of the detection signal, but considering the noise of anchor detection signal, using the experience in Hilbert-Huang transform mode decomposition method to detect the signal is decomposed into several intrinsic mode signal, on the part of the intrinsic mode signal time-frequency analysis, namely using joint time-frequency analysis method to analyze the signal model of bolt.Through the joint model of bolt with different anchoring defect detection signal time-frequency analysis, the results show that the method can accurately determine the location and size of anchor defects. However, the anchor system is a very complex system, stress wave nondestructive testing of the theory is not perfect, resulting in the overall detection accuracy is not high, to be further in-depth study of the anchor researchers.