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| In － situ Test and Analysis of Dynamic Responses of Red Clay Cutting Bedding of Wuhan － Guangzhou Passenger Dedicated Line |
| WU Qiang |
| China Railway Siyuan Survey and Design Group Co． Ltd，Wuhan，Hubei 430063，China |
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Abstract Research purposes: The subgrade bed should have enough strength and stability to bear the train and track loads． With continuous increase of the train speed，the in － situ test and analysis of dynamic responses of red clay cutting bedding is very important to guide the design of the subgrade of high － speed railway．
Research conclusions: By in － situ test，the study was done on the dynamic responses characteristic of red clay cutting bedding of Wuhan － Guangzhou Passenger Dedicated Line at the locomotive speed of 300 ～ 350 km / h． The horizontal and vertical distribution regularity of the vibration velocity，vibration acceleration，dynamic strain and dynamic stress were analyzed under the condition that the train run in the different directions． The analysis showed all the response parameters of the vibration velocity，vibration acceleration，dynamic strain and dynamic stress were decreasing with the depth increasing． In the lateral test section，the change of response of the subgrade bedding was of the reversed V － shaped under effect of the train on right track and the response decreased with increase of the lateral distance under effect of train on the left track． Compared with the ballast track，the dynamic responses and decay rate of ballastless track were smaller，while the influence depth was larger． So it suggests the thickness of subgrade bedding of ballastless track should be 5 m． This study can provide an important reference to construction of other high － speed railway．
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Received: 20 May 2011
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2011, Vol. 28 
