About the author:

The Third Engineering Co., Ltd. of China Railway 18th Bureau Group Co.,Ltd., Zhuozhou, Hebei 072750,China

Abstract:

Shield tunneling readily induces vibration in the pile foundations of adjacent buildings. Toelucidate the response characteristics of buildings induced byvibration caused in shield tunneling andtheir propagation mechanisms, this paper investigated the problem through field vibration monitoring andnumerical simulation by FLAC3D based on the shield tunnel project of Nanchang Metro Line 4. The resultsindicate: Measured data show that the vibration velocity in the shield machine􀆳s direction of advance islargest at the first segmental lining ring and at the ground surface of adjacent buildings; The numericalsimulation reveals that the floor vibration is amplified layer by layer with the increase of floor height, andthe amplification coefficient increases from 1.00 to 3.01,which reflects the floor amplification effect ofthe building on the vibration; Vibration caused in shield construction is predominantly low⁃frequency,mainly concentrated below 5Hz, and monitoring points at different depths within the same pile foundationexhibit synchronous response characteristics,with the pile from head to toe tending toward resonance.