Reduction of metro vibrations by honeycomb columns under the ballast: Field experiments. Issue 129 (February 2020)

• Record Type: Journal Article
• Authors: Gao, M.; Xu, X.; Chen, Q.S.; Wang, Y.
• Is Part Of: Soil dynamics and earthquake engineering. Issue 129(2020)
• Publication Date: 2020-02
• Subjects: Environmental vibration -- Vibration generated by metro -- Duxseal-cement columns -- Isolation effect -- One-third octave spectrum; Soil dynamics -- Periodicals; Earthquake engineering -- Periodicals; Sols -- Dynamique -- Périodiques; Génie parasismique -- Périodiques; 624.176205
• DOI: 10.1016/j.soildyn.2019.105913
• Languages: English
• ISSNs: 0267-7261

Abstract

Abstract: Environmental vibrations induced by subway operation are harmful to human health and structures when they exceed a certain value. Therefore, effective measures should be taken to reduce the noise and vibration generated by the metro. Therefore, a method to reduce the vibration by the installation of honeycomb Duxseal-cement columns under the ballast is presented in this paper. A honeycomb Duxseal-cement column was embedded in the subgrade of Qingdao Metro Line 13. A field test to measure the vibration of Qingdao Metro Line 13 was conducted. In addition, the time history curve of the vibration acceleration was obtained by processing the data and a Fourier transform was conducted for the test data to obtain a corresponding frequency spectrum curve. The spectrum curve was then converted into the one-third octave spectrum. Finally, the average value of the frequency vibration levels was determined. The comparison between the vibration generated by the metro filling and non-filling Duxseal-cement columns was investigated in detail. The test results show that the subgrade of metro in-filled by the Duxseal-cement columns obtains a better isolation effect than that of non-filling Duxseal-cement columns. The honeycomb Duxseal-cement columns present in the metros decrease their vibration accelerations in three directions, the X-, Y-, and Z-directions, by 33%, 28%, and 40%, respectively, compared with the original. Highlights: Vibration reduction effectiveness for metro by Duxseal-cement is investigated. Field test characterized Duxseal-cement with good wave absorption capability. Vibration characteristics of ground vibrations due to metro were analyzed.