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| Settlement Control Technology of Railway Subgrade on Soft Soil Foundation |
| ZHAO Xin-yi, LI Shi-liang, WANG Ying-he |
| China Railway Siyuan Survey and Design Group Co. Ltd, Wuhan, Hubei 430063, China |
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Abstract Abstract：Research purposes： The settlement control on soft soil foundation is the key technology in the subgrade construction of high-speed railway. Combined with the development and construction of high-speed railway in China, the representative experimental sites from Beijing-Shanghai high-speed railway, Wenzhou-Fuzhou railway, Shanghai-Hangzhou passenger dedicated line were chosen, which represented different region, different genetic and different treatment of soft soil. Based on the in-site test data, the bearing and deforming properties and settlement control effect were researched systematically.
Research conclusions：(1) Drainage consolidation method of soft soil was not proposed using in ballastless track because of its rigid settlement control criterion, however, combined with pre-loading technique and enough storage time, drainage consolidation method could meet the post-construction settlement requirements. (2) Using the soil-cement pile composite foundation in ballastless track should have experience and enough storage time, and it should be cautious. (3) The pile-net structure and pile-raft structure of cement-flyash-gravel pile or prestressed reinforced concrete pile could be used in soft soil foundation of ballastless track because of good settlement control effect and short stabilization time. （4）The pile-plank structure could control the settlement excellently, but because of the high cost it was only used in special conditions. (5) The conclusions could be used in the treatment method choosing and settlement control of soft soil of high-speed railway.
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