高速铁路桥路过渡段动应力测试与分析

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Abstract Research purposes:The smooth and safety operation of high － speed train need the subgrade to provide the sub － rail supporting system with the small settlement，high stiffness and stable dynamic characteristics． For the Wuhan －Guangzhou high － speed railway，the bridge － subgrade transition section was designed to realize the smooth transition of stiffness and settlement between the bridge and subgrade． The test cells were placed in test transition section during the construction to test the spatial distribution characteristics of the dynamic stress when the CRH2 EMU run in the transition section．

Research conclusions:The maximum dynamic stress of bridge － subgrade transition section appeared in the turn corner of the trapezoidal bottom of the transition section with the average value of 12.73 kPa．After the surface of the foundation bed of the transition section was reinforced by the graded broken stone，the dynamic stress of transition section in the vertical reduced quickly and the attenuation rate was up to 90% on the bottom of the subgrade bed．The dynamic stress of the bed surface in the transition section increased by about 20% when the train speed increased from 200 km /h to 250 km /h，and the dynamic stress of the bed surface increased by about 10% when the train speed increased from 250 km /h to 350 km /h．

Key words： high － speed railway bridge － subgrade transition section dynamic stress test on site spatial distribution

Received: 10 May 2012

PACS:

U238

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Cite this article:

XU Hong － xing. Test and Analysis of Dynamic Stress of Bridge － subgrade Transition Section of High － speed Railway[J]. 铁道工程学报, 2012, 29(8): 1-5.

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http://tdgcxb.crec.cn/EN/ OR http://tdgcxb.crec.cn/EN/Y2012/V29/I8/1

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