Investigating the Optimized Open V-Shaped Trench Performance in Reduction of Train-Induced Ground Vibrations

AbstractAn effective strategy in reducing train-induced vibrations on neighboring structures is to use open trenches on both sides of the railway lines. This paper investigates the effect of the trench’s shape on its performance. For this purpose, a V-shaped trench was first modeled using finite-element code, and its efficiency was confirmed in reducing the induced vibrations caused by passing the MD36 passenger bogie in comparison with a rectangular-shaped trench. In this regard, results indicate that the maximum values of the amplitude reduction ratio (Ar) for the ground displacement before the V-shaped trench for train speeds of 80 and 120 km/h were 1.17 and 1.28, respectively, which were less than the value of 2 obtained for the rectangular trench. In the final stage, an optimization algorithm was used to present the procedure of calculating optimized shape of the proposed V-shaped trench for various train speeds.

[1]  S. Ahmad,et al.  Investigation on active isolation of machine foundations by open trenches , 1996 .

[2]  Omar Laghrouche,et al.  Soil railway interaction for active isolation of traffic vibration , 1994 .

[3]  Yih-Hsing Pao,et al.  Scattering of Plane Compressional Waves by a Spherical Obstacle , 1963 .

[4]  Anders Karlström,et al.  Efficiency of trenches along railways for trains moving at sub-or supersonic speeds , 2007 .

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

[6]  Ioannis Vardoulakis,et al.  Vibration isolation using open or filled trenches Part 2: 3-D homogeneous soil , 1990 .

[7]  Shozo Kawamura,et al.  Isolation effect of a dynamic damper and a trench on ground vibration caused by a construction machine , 2011 .

[8]  Yih-Hsing Pao,et al.  Diffractions of Horizontal Shear Waves by a Parabolic Cylinder and Dynamic Stress Concentrations , 1966 .

[9]  G P Wilson,et al.  Control of ground-borne noise and vibration , 1983 .

[10]  G. Gao,et al.  3D analysis of in-filled trench as passive barriers for ground vibration isolation , 2008 .

[11]  Morteza Esmaeili,et al.  Numerical investigation of the effectiveness of a step-shaped trench in reducing train-induced vibrations , 2014 .

[12]  R. Müller.  Mitigation Measures for Open Lines against Vibration and Ground-Borne Noise: A Swiss Overview , 2008 .

[13]  J. Lysmer,et al.  Shear Waves in Plane Infinite Structures , 1972 .

[14]  Dimitri E. Beskos,et al.  Vibration isolation using open or filled trenches , 1986 .

[15]  Yeong-Bin Yang,et al.  Wave barriers for reduction of train-induced vibrations in soils , 2004 .

[16]  Gaetano Di Mino,et al.  Assessing the Open Trenches in Screening Railway Ground-Borne Vibrations by Means of Artificial Neural Network , 2009 .

[17]  G. L. Sivakumar Babu,et al.  Analysis and Design of Vibration Isolation System Using Open Trenches , 2011 .

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

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

[20]  Søren Nielsen,et al.  Reduction of ground vibration by means of barriers or soil improvement along a railway track , 2005 .