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Vibration impact of trains on thawed soil subgrade(PDF)

《长安大学学报》自然版[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2017年04期
Page:
18-24
Research Field:
冻土路基专栏
Publishing date:

Info

Title:
Vibration impact of trains on thawed soil subgrade
Author(s):
PETRIAEV A
Construction of Roads Transport Complex Department, Emperor Alexander Ⅰ St. Petersburg State Transport University, St. Petersburg 190031, Leningrad, Russia
Keywords:
subgrade engineering dynamic vibration impact vertical and horizontal stresses thawing subgrade attenuation of oscillation amplitude
PACS:
U211.3
DOI:
-
Abstract:
This paper mainly presents the field studies of vibration impact from passing trains on the roadbed melting ground. The movement of railway rolling stock may cause oscillations on track superstructure, which manifest themselves in the form of noise and vibration. The increasing loads and speeds of trains lead to significant increases of dynamic vibration effects on the roadbed. The accumulated intensity of uneven residual deformation of railway track increases as a result that affects not only on roadbed, but also on constructions of buildings. The geosynthetics were used to design the superstructure for reducing the negative impact of vibration. The results show that during the passage of long train, the vibration process of railway subgrade soil has complex randomness, and it is accompanied by strong low harmonic and mid harmonic in all three components. Two trains passing by each other may cause preferential oscillation on the vertical plane of thawing subgrade. Compared with summer, subgrade thawing layer and boundary humidity lead to the average amplitude of vibration increasing 1.5 to 2 times, this part of significant growing vibration effect must be pay attention to when calculating the bearing capacity of subgrade. Compared with the melted soil, vibration distributions of inside and outside of subgrade can be described by means of a less attenuated exponential correlation. At the distance from 5 to 7 m to the track axis, the damping rate of vibration amplitude is 72% to 84% in the horizontal transverse direction. It is found for the first time that the damping amplitude of subgrade at the embankment is less than that in the cut.

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Last Update: 2017-07-17