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| Study on Support Foundation of OCS Under Condition of Soft Soil Subgrade of Xuzhou - Lianyungang Railway |
| ZHANG Man-hua，LI Fang-an，YANG Zhen-long，LI Wen-hao |
| The Third Railway Survey and Design Institute Group Corporation, Tianjin 300251，China |
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Abstract Research purposes：During the electrified reconstruction of the Xuzhou 一 Lianyungang Railway, it was found the topsoil in Liangyungang area was soft clay like the marine clay and the muddy clay, with the mud silt under it. Under the effect of loading，the bearing capacity of the foundation was very low and the ground had a big settlement and deformation, easily resulting in the uneven settlement. When the external disturbances took place, the soil structure would be damaged with the sharp drop of the soil strength. So the geological condition in this area was extremely poor for the project. Considering the actual situation of the electrification reconstruction of the railway, it was necessary to do the study on the treatment plan for the support foundation of OCS under condition of soft soil subgrade of the Xuzhou - Liangyungang Railway.
Research conclusions：(1) In the high filling region with deep topsoils, the “T - type” foundation would be adopted, with its flange to bear the vertical loads so that the foundation would not settle. It had less impact on the traffic safety because of the less excavation of the deep soft soil. (2) In the subgrade region with the filling thickness of less than 2. 0 meters, the shallow foundation with the expanded underside would be designed. After replacement of substrate material, some parts of the soft soil subgrade would be reinforced by filling the flagstones and compacted by filling the sandy and stony soils. When the bearing capacity of the foundation met the design requirement, the shallow foundation with the constructed so as to lower the requirement of the foundation for the bearing capacity of the undisturbed soil. (3) The shallow foundation with the expanded underside was proved safe and feasible by the field testing. The horizontal displacement of the foundation surface, the foundation torsional angel and the support deflection met the technical demands of the design. (4)This research result could provide the reference to the similar works.
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Received: 22 January 2013
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2013, Vol. 30 
