|Table of Contents|

Dynamic characteristics and parameter sensitivities of new cutting subgrade for high-speed railway in expansive soil area(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2016年01期
Page:
63-72
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Dynamic characteristics and parameter sensitivities of new cutting subgrade for high-speed railway in expansive soil area
Author(s):
YANG Guo-lin1 QIU Ming-ming1 YANG Xiao2 FANG Yi-he1
1. School of Civil Engineering, Central South University, Changsha 410075, Hunan, China;
2. Department of Civil Engineering, Monash University, Clayton 3800, Victoria, Australia
Keywords:
high-speed railway new cutting subgrade numerical simulation dynamic response expansive soil sensitivity analysis
PACS:
U213.1
DOI:
-
Abstract:
The field vibration test of comprehensive experimental section for new cutting subgrade of Yun-Gui High-Speed Railway in expansive soil area was carried out, the 3D track-subgrade-base dynamics model was established by adopting the finite difference software FLAC3D, and the dynamic responses of new cutting subgrade and the factors sensitivity of water-proof structure layer were studied. Analysis result shows that the water-proof layer can accelerate the attenuation of dynamic stress in subgrade, and reduce the dynamic displacement of subgrade surface. Increasing the thickness and elastic modulus of water-proof layer can reduce the dynamic displacement and the dynamic stress of subgrade beneath the water-proof layer, but will increase the dynamic stress of water-proof layer surface. When the position of water-proof layer lowers, the dynamic stress of subgrade surface increases, but the dynamic displacement of subgrade surface hardly changes. It is recommended that the thickness of water-proof layer is not less than 15 cm for the requirements of Code for Design of High Speed Railway(TB 10621—2009). The sensitive factors to the dynamic stress and displacement of subgrade surface and the dynamic stress of base surface are the laying position, elastic modulus and thickness of water-proof layer in the influence order from big to small. Considering the factors' effects on the dynamic responses of subgrade, it is the optimal solution that the laying thickness of water-proof layer is 20 cm, the elastic modulus is 1.0 GPa, and the laying position is the bottom of subgrade surface. 7 tabs, 17 figs, 25 refs.

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Last Update: 2016-02-20