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| Detection Test and Condition Assessment on Existing Heavy Hual Railway Subgrade |
| NIE Ru-song1, LENG Wu-ming2, YANG Qi3 |
1. Central South University, Changsha, Hunan 410075, China;
2. National Engineering Laboratory for High Speed Railway Construction, Changsha, Hunan 410075, China;
3.Key Laboratory of Heavy Haul Railway Engineering Structure, Ministry of Education, Changsha, Hunan 410075, China |
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Abstract Research purposes:Field tests including the degree of compaction K, water content, direct shear test, N10, K30, the strain modulus Ev2 and dynamic deformation modulus Evd were performed on four typical subgrade diseases worksite of Shenchi-Huanghua Heavy Haul Railway, the compaction performance, deformation behavior and bearing capacity of the subgrade were systematically assessed. For the feasibility and representative of subgrade test of existing railway, ignore the influence of the new rolling residual stress and train load repeated function, a plane strain finite element model was set up to analyze the initial state of subgrade which can give reference for determining the field testing points and confining pressure of dynamic triaxial tests in lab.
Research conclusions:(1) The compaction performance, the deformation behavior and bearing capacity of the four subgrade worksite with diseases fail to meet the requirements of Chinese codes, which need to be reinforced. (2) The initial state of subgrade is very complicated. If the residual stress induced by rolling and train load is neglected, the soil mass 5.5~6.0 m away from the centre of subgrade and 0.6~1.2 m depth from subgrade surface is in K0 condition. (3) When the dynamic triaxial tests in lab for subgrade fillings are performed, the determination of load parameters should take the initial state of subgrade into account. (4)The results are helpful for detection test and condition assessment of railway subgrade.
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Received: 14 March 2014
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2014, Vol. 31 
