EFFECT OF SUBWAY INDUCED ENVIRONMENTAL VIBRATION ON BUILDING SITE THROUGH IN-SITU MEASUREMENT
GAO Guangyun;GENG Jianlong;BI Junwei;YOU Yuanyang;Department of Geotechnical Engineering,Tongji University;Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University;
This paper investigates the influence of subway induced vibration on a proposed residential office building. It performed filed measurements lasting 24 hours at this building site. Applying a high-precision instrument TROMINO,we recorded the vibration data of acceleration and velocity on three directions simultaneously.For analyzing the environmental vibration characteristics at different periods in a day,we used the one-third octave band spectrum method to analyze the test data. The results show that the peak of environmental vibration during subway operating time is greater than that without subway. The ground vibration acceleration beyond subway operating time is in the range of 10~(-5)～ 10~(-1) gal,and has no obvious dominant frequency. The acceleration amplitude of ground vibration in subway operation hours is between 10~(-4)-10~0 gal. Under the superposition of various factors in the evening peak period,the vibration acceleration of the proposed site reaches the maximum value of 0. 8 gal. The dominant frequency of ground vibration induced by the subway lies in the frequency range of 40 ～ 50 Hz. In the low frequency range( 2 ～ 8 Hz),the peak ground acceleration is 0. 030 gal,and the maximum value of velocity reaches 26. 715 μm·s~(-1) in the medium-high frequency range( 8 ～ 250 Hz). One-third octave band spectra of testing vibrations locates below the standard curves specified in the ISO 2631 totally,which indicates that the design requirements are satisfied.