Abstract

This paper describes the potential use of geocell reinforcement in mitigating the traffic induced vibration. The vibration caused by the vehicular movement was simulated over the unreinforced and geocell reinforced sections using mechanical oscillator. The displacement amplitude and peak particle velocity were measured to understand the vibration mitigation efficacy of geocell. The effect of depth of placement of geocell on the mitigation of vibration parameters was studied. The inclusion of geocell was found effective in reducing the induced vibration based on the experimental results. The vibration mitigation efficacy of geocell was improved significantly at the shallow depth of placement of geocell mattress. The improvement in elasticity of the subgrade was observed maximum when the geocell was placed at a depth of 0.1B from the ground surface. Further, analytical and numerical approaches were used to predict the displacement amplitude versus frequency response of reinforced soil sections. FLAC3D was used for performing the numerical investigation. The geocell was modelled according to its honeycomb shape to acquire the accurate response of geocell reinforced section. Whereas, mass spring dashpot analogy was followed for the analytical evaluation. In overall, the amplitude response predicted from the numerical and analytical studies were found to be in good agreement with the experimental results.

Highlights

  • The mitigation of intense levels of ground vibration generated by the rail and road networks is a common concern in urban areas

  • The efficacy of geocell in controlling the displacement amplitude of vibration was quantified in terms of amplitude reduction ratio (ARR)

  • The minimum ARR is generally recommended for better screening of the ground vibration

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Summary

Introduction

The mitigation of intense levels of ground vibration generated by the rail and road networks is a common concern in urban areas. These vibrations can possibly exhibit adverse effects on the nearby structures, sensitive equipment, technical processes, and inhabitants (Murillo et al, 2009). The intensity of vibration is majorly influenced by both traffic and rail or road performance. The vehicle weight and speed are the major traffic characteristics. Structure/subgrade stability and roughness are the performance parameters.

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