Study on dynamic response of saturated soft clay under the subway vibration loading I: instantaneous dynamic response

In this paper, the results of the instantaneous dynamic response of saturated soft clay under the subway vibration loading are presented. Based on the assumption of soil as viscoelastic medium, wave equation under forced vibration of three-dimensional anisotropy is derived, and time–space domain semi-analytical solution is given through Laplace and Fourier transform and their inverse transform using MATALB. Taking Shanghai metro line No. 2 for example, the dynamic monitoring is conducted with embedded earth pressure gauges and pore piezometers around the tunnel, and the horizontal response amplitude of dynamic stress of soil around the tunnel is calculated by the method presented in this paper with the laboratory Global Digital System test apparatus to determine the related calculation parameters. Then, a comparative analysis is made between calculation result and continuous field monitored data, and it is found that the attenuation trend of the two cases agree well with each other both in the horizontal and vertical direction, which indicates that the method presented in this study is reasonable.