A Comparative Estimation of Vibration Level of Track Concrete in the Metro with Various Types of Under-Rail Bases

Among the factors determining the quality state of the environment are noise and vibration. In cities where there is a subway, an additional source of noise and vibration are subway lines. The impact of vibration can adversely affect the condition of buildings, communications, the construction of the subway itself, as well as people living and working in the buildings located along the metro line. The purpose of this work is to determine the effectiveness of using a reinforced concrete under-rail base by the criterion of reducing vibration in a subway tunnel. The object of the study was the construct of the under-rail base in subway. The subject of the study is the intensity of vibration of track concrete with various designs of the under-rail base: typical with wooden sleepers, embeded concret sleepers with vibration-proof rubber gaskets and without them. To assess vibration levels for all three types of under-rail bases, the measurements were made of vertical acceleration of vibrations on track concrete during the movement of subway trains. The measurements were carried out with the help of a computer-measuring complex based on the equipment of the firm "Bruel & Kjsr". The analysis of the measurement results was carried out in octave bands. It was stated that the use of a embedded concret sleepers without vibration protection allows to decrease the overall vibration level of track concrete approximately a third of in relation to a typical design, and the use of a embeded concret sleepers with vibration protection leads to a decrease the total vibration level of track concrete by more than 5 times. It turned out that the use of rubber gaskets under the embedded concrete sleepers leads to an increase in the vibration level in the low-frequency range (0 - 40 Hz) with negligible absolute values.

метропоезд, акселерометр, вибрация, виброзащита, ускорение колебаний, октавные полосы, резиновая прокладка, железобетонные лежни, шпалы, подрельсовое основание

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