Prediction and mitigation analyses of ground vibrations induced by high speed train with 3-dimensional finite element method and substructure method

This paper focuses on the dynamic interactions between a Shinkansen viaduct and the nearby ground when a high speed train is running along the viaduct. Due to the characteristics of the structure-foundation-soil system, a substructure method is employed to divide the global system into two substructures: one consists of the superstructure of track girder and supporting piers, the other consists of the foundation and near ground. Both substructures have continuity conditions at the interfaces, i.e. deformation continuity and force continuity. The superstructures are modeled by 3-dimensional (3-D) beam elements with a structural procedure, while the substructure is analyzed through a pseudo 3-D axisymmetric finite element method. A field test was conducted in the near field of the Shinkansen viaduct to examine the vibration level. The measurement data also help us to understand the wave motion influenced by the geometric properties of the structures and the moving train. Based on the field test results, a thorough interpretation is provided by analyzing both the structures and the soil. Further, computation simulation is conducted to investigate the vibrations in the ground to a wider extent. According to the nature of vibration, a combined countermeasure is proposed which involves the source motion control and the wave propagation obstruction. Satisfactory mitigation is achieved by the combined measure.

[1]  R. Woods.  SCREENING OF SURFACE WAVES IN SOILS , 1968 .

[2]  S. Ahmad,et al.  Active isolation of machine foundations by in-filled trench barriers , 1996 .

[3]  Hirokazu Takemiya.  THREE-DIMESIONAL SEISMIC ANALYSIS FOR SOIL-FOUNDATION-SUPERSTRUCTURE BASED ON DYNAMIC SUBSTRUCTURE METHOD , 1985 .

[4]  John F. Abel,et al.  Amplitude Reduction of Surface Waves by Trenches , 1978 .

[5]  Hirokazu Takemiya,et al.  ENHANCED SEISMIC DESIGN OF A PILE FOUNDATION BY CELL-TYPE WIB , 2006 .

[6]  S. Ahmad,et al.  Simplified design for vibration screening by open and in-filled trenches , 1991 .

[7]  Hirokazu Takemiya,et al.  RING-PILE ANALYSIS FOR A GROUPED PILE FOUNDATION SUBJECTED TO BASE MOTION , 1986 .

[8]  Hirokazu Takemiya,et al.  TRAFFIC-INDUCED VIBRATONS FROM VIADUCT: HYBRID PROCEDURE OF MEASUREMENT AND FEM ANALYSIS FOR PREDICTION AND MITIGATION OF GROUND MOTIONS , 2006 .

[9]  George D. Manolis,et al.  Shallow Trenches and Propagation of Surface Waves , 1985 .

[10]  E John,et al.  Dynamic Response of the , 1993 .

[11]  Hirokazu Takemiya,et al.  Field vibration mitigation by honeycomb WIB for pile foundations of a high-speed train viaduct , 2004 .

[12]  O. von Estorff,et al.  Dynamic response of 2D and 3D block foundations on a halfspace with inclusions , 1994 .

[13]  E. Kausel,et al.  Stiffness matrices for layered soils , 1981 .

[14]  Yeong-Bin Yang,et al.  A parametric study of wave barriers for reduction of train-induced vibrations , 1997 .

[15]  Hirokazu Takemiya,et al.  Wave propagation/impediment in a stratum and wave impeding block (WIB) measured for SSI response reduction , 1994 .