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DOI: 10.14489/td.2022.09.pp.036-045
Лозовский И. Н., Лосева Е. С., Сясько В. А.
ФИЛЬТРАЦИЯ ДАННЫХ СЕЙСМОАКУСТИЧЕСКОГО КОНТРОЛЯ СПЛОШНОСТИ СВАЙ С ИСПОЛЬЗОВАНИЕМ НЕПРЕРЫВНОГО ВЕЙВЛЕТ-ПРЕОБРАЗОВАНИЯ
(с. 36-45)
Аннотация. Сейсмоакустический метод контроля железобетонных свай широко применяется благодаря высокой производительности и небольшому объему работ по подготовке свай к испытаниям. При низких значениях отношения сигнал/шум традиционные методы анализа сигналов зачастую не позволяют оценить длину и сплошность испытуемых конструкций. Представлена методика частотно-временного анализа данных сейсмоакустического контроля с использованием непрерывного вейвлет-преобразования, позволяющая выделить информативные составляющие сигналов, осложненных интенсивными помехами. Приведены результаты анализа сигналов с использованием различных материнских вейвлетов, показаны преимущества применения комплексного вейвлета Морле. Для выделения полезной составляющей сигнала предложено выполнять медианное усреднение значений энергии вейвлет-коэффициентов в диапазоне частот, в пределах которого наиболее ярко выражен импульс, отвечающий возбуждению упругих волн в свае. Возможности методики проиллюстрированы на данных сейсмоакустического контроля с добавлением синтетического шума и на результатах испытаний буронабивной сваи большой длины. Применение методики позволит повысить надежность и информативность результатов интерпретации данных сейсмоакустических испытаний свай.
Ключевые слова: сваи, буронабивные сваи, неразрушающий контроль, контроль сплошности свай, сейсмоакустический метод, непрерывное вейвлет-преобразование.
Lozovsky I. N., Loseva E. S., Syasko V. A.
WAVELET DENOISING FOR LOW STRAIN PILE INTEGRITY TESTING
(pp. 36-45)
Abstract. Low strain impact test is widely used to assess the structural integrity of reinforced concrete piles due to its high productivity and cost effectiveness. However, a low signal-to-noise ratio may prevent proper evaluation of pile length and integrity using the standard data analysis approaches. In this paper, we propose a technique for the time-frequency analysis of low strain test data, which allows us to separate the useful components of a signal from the unwanted ones. The technique is based on the continuous wavelet transform with the complex Morlet wavelet, which is shown to be the most suitable for the low strain test data decomposition. To filter the signal, the moving median of the square modulus of the continuous wavelet transform is calculated in the frequency band of the initial impact pulse. The capabilities of the technique are illustrated by the low strain test signals with the artificial noise and the results of a field test of a 30m long bored pile.
Keywords: piles, bored piles, drilled shafts, non-destructive testing, pile integrity testing, low strain impact integrity testing, continuous wavelet transform, wavelet denoising.
И. Н. Лозовский (Центр геоэлектромагнитных исследований – филиал Института физики Земли им. О. Ю. Шмидта РАН, Москва, Россия) E-mail:
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Е. С. Лосева, В. А. Сясько (Санкт-Петербургский горный университет, Санкт-Петербург, Россия) E-mail:
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I. N. Lozovsky (Geoelectromagnetic Research Center, Branch of the Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences (GEMRC IPE RAS), Troitsk, Moscow, Russia) E-mail:
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E. S. Loseva, V. A. Syasko (Saint Petersburg Mining University, Saint Petersburg, Russia) E-mail:
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27. Ermolin E. Yu., Ingerov O., Yankilevich A. A., Pokrovskaya N. N. (2019). AMT Soundings in the Dead Band Within the Chukotka Region (Russian Far East). Journal of Mining Institute, Vol. 236, (2), pp. 125 – 132. Available at: https://doi.org/10.31897/pmi.2019.2.125
28. Zhukovskiy Y. L., Kovalchuk M. S., Batueva D. E., Senchilo N. D. (2021). Development of an Algorithm for Regulating the load Schedule of Educational Institutions Based on the Forecast of Electric Consumption Within the Framework of Application of the Demand Response. Sustainability, Vol. 13, 24, pp. 1 – 26. Available at: http://dx.doi.org/10.3390/su132413801
29. Morenov V., Leusheva E., Lavrik A. et al. (2022). Gas-Fueled Binary Energy System with Low-Boiling working fluid for enhanced power generation. Energies, Vol. 15, (7), pp. 1 – 15. Basel. Available at: http://dx.doi.org/10.3390/en15072551
30. Koteleva N., Valnev V., Frenkel I. (2021). Investigation of the Effectiveness of an Augmented Reality and a Dynamic Simulation System Collaboration in oil Pump Maintenance. Applied Sciences, Vol. 12, (1), pp. 1 – 18. Available at: https://doi.org/10.3390/app12010350
31. Bolobov V., Martynenko Y. V., Voronov V. et al. (2022). Improvement of the Liquefied Natural Gas Vapor Utilization System Using a Gas Ejector. Inventions, Vol. 7, (1), pp. 1 – 10. Available at: https://doi.org/10.3390/inventions7010014
32. Dvoynikov M., Budovskaya M. (2022). Development of a Hydrocarbon Completion System for Wells with Low Bottomhole Temperatures for Conditions of Oil and Gas Fields in Eastern Siberia. Journal of Mining Institute, Vol. 253, pp. 12 – 22. Available at: https://doi.org/10.31897/PMI.2022.4
33. Islamov S. R., Bondarenko A. V., Gabibov A. F., Mardashov D. V. (2020). Polymer Compositions for Well Killing Operation in Fractured Reservoirs. Advances in Raw Material Industries for Sustainable Development Goals. 1st ed, pp. 343 – 351. CRC Press. Available at: https://doi.org/10.1201/9781003164395-43
34. Litvinenko V., Tsvetkov P., Dvoynikov M., Buslaev G. (2020). Barriers to Implementation of Hydrogen Initiatives in the Context of Global Energy Sustainable Development. Journal of Mining Institute, Vol. 244, pp. 428 – 438. Available at: https://doi.org/10.31897/pmi.2020.4.5
35. Shammazov I. A., Sidorkin D. I., Dzhemilev E. R. (2022). Research of the Dependence of the Pipeline Ends Displacement Value when Cutting out Its Defective Section on the Elastic Stresses in the Pipe Body. IOP Conference Series: Earth and Environmental Science, Vol. 988, (2), pp. 1 – 9. Available at: https://doi.org/10.1088/1755-1315/988/2/022077
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