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Abstract

Summary

For last 20–30 years, the speed of movement on the railways was increased to 500–600 km/h. This requires a high level of reliability of all elements of the chain “locomotive - train - railways - retaining walls, in particular”. For the proper management of the railway structures it is important to detect deformations of the structures at an early stage. The aim of the report is to develop a nondestructive inspection method for the condition rating of the existing retaining walls. To determine the dynamic and physical-mechanical characteristics of the retaining wall its complex inspection was performed. External factors of dynamic effects on the retaining wall are the following: alternating microseismic effects of natural character caused by the location of the inspected object in the seismic zone of the Carpathians foothill (Vrancea zone); alternating dynamic effects caused by movement of trains on the inspected area of the railway. Microseismic ground vibrations occur constantly and have variable character both by direction and intensity. Registered vibrate-acceleration maximum amplitude of the retaining wall under the influence of micro-seismic vibrations and moving trains does not exceed 0.004 m/c2. The results of calculations show the corresponding natural frequency oscillations - 9.46 Hz. The difference with the experimentally registered frequency is 1.46 Hz.

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/content/papers/10.3997/2214-4609.20215521004
2021-05-11
2024-04-26
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