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| EXPERIMENTAL RESEARCH ON THE GEOCELL OF COMPOUND SUBGRADE-BED FOR PASSENGER DEDICATED RAILWAY LINE |
| CAO Xin-wen, CAI Ying |
| School of civil engineering, Southwest Jiaotong University, Sichuan Chengdu 610031 |
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Abstract Research purpose: The permanent deformation of the subgrade-bed under the repeated loading of the train deteriorate the truck state. Increasing the strength and the stiffness of subgrade-bed can abate the damage.
Research method: In this paper, 4 group of model tests are carried out under the simulated field conditions to study the dynamic performances of the subgrade-bed for passenger dedicated railway line with different thickness and reinforced with the geocell. The length, width and height of the model are 7 m, 5m and 1.05-1.55 m. In order to simulate the action of the passenger dedicated railway line wheel load on the subgrade bed, the 5Hz cyclic loading is repeated 1.5 million times in every group of test.
Research result: In order to compare the model tests, the test in situ was carried out. Refer to the subgrade-bed without geocell, the dynamic stress of the subgrade bed with geocell is smaller and more uniform, the elastic deformation and the permanent deformation decrease obviously.
Research conclusion: By comparing with the live model tests, the strength and the stiffness of the subgrade-bed with geocell which thickness is 30cm can satisfy the demands of the passenger dedicated railway line.
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Received: 10 October 2005
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2006, Vol. 23 
