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Vibrational diagnostics and physical modeling of subgrade at the railway line nearby White Sea for deregulation of train speed limit(PDF)

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

Issue:
2017年04期
Page:
34-40
Research Field:
冻土路基专栏
Publishing date:

Info

Title:
Vibrational diagnostics and physical modeling of subgrade at the railway line nearby White Sea for deregulation of train speed limit
Author(s):
EVGENY S ASHPIZ ANDREY A ZAYTSEV
Moscow State University of Railway Engineering of Emperor Nicholas Ⅱ, Moscow 127994, Moscow, Russia
Keywords:
subgrade engineering weak foundation peat physical modeling vibrational diagnostic stabilization
PACS:
U467.1
DOI:
-
Abstract:
The complex researches were carried out at the Russian North Railways on the routes of freight traffic, in direction of the embankments on weak (peaty and clayed) foundation. These complex researches included vibration diagnostics for prototypes, physical modeling, calculation of the deforming embankments and the variants of its reinforcing. Evaluation of efficiency of reinforcing of the peat foundation by wooden piles was provided by the centrifuge modeling. The results were compared with modeling embankments without reinforcing. Embankments on Obozerskaya-Malenga Line (northern part of Russia, Arhangelsk and Murmansk region) were taken as a prototype of the embankments. In MIIT(Moscow State Railway University), the numerical calculation methods of foundation stability, elastic settlement and final settlement are applied, and the influencing factors and coefficients of stability were determined by using special software. The results show that failure of embankments modeling without reinforcement in view of the bearing capacity which realized in the reduction of the embankment top, and displacements of the surcharge which fixed to the right side of the models. According to the base uplift of the foundation peat (for each side of the embankment model), the deformation tends to approach the slope of the embankment model, in which case the maximum settlement exceeds 15 mm. The further activities on the embankment: for the embankments where the unstable state is recorded on the basis of the main criterion, it is recommended to conduct a detailed survey and to make a project of reinforcing of the subgrade.

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Last Update: 2017-07-17