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| REINFORCEMENT TECHNIQUE FOR SUBGRADE IN SOFT SOIL ZONE BY COMPOSITE STRUCTURE OF CFG PILE-NET AND ITS APPLICATION |
| LI Chang-ning1, WANG Bing-long2, ZHOU Shun-hua2 |
| 1Technical Development Centre of the First Engineering Group Co. Ltd. of Chinese Railway; 2Tongji University, shanghai 201103 |
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Abstract Research purpose: The exploration is made on issues of design and construction for reinforcing subgrade in soft soil zone by CFG pile.
Research method: The design method, construction technique, quality check method and cautions are described in details for reinforcing subgrade in soft soil zone by adopting composite structure of CFG pile-net and the mechanism of reinforcing subgrade in soft soil zone is analyzed and explored on the basis of an example of reinforcing subgrade in deep soft soil zone in trial section of one high-speed railway in Shanghai by adopting composite structure of CFG pile-net. The relative experiments and site test research are made on the reinforcement effect of two different pile lengths, the law of settlement deformation and gorged stress under embankment load.
Research result: The composite structure of CFG pile-net to penetrate soft soil bed with pile length of 27 m can meet the requirements of the capacity of subgrade in soft soil zone against high-speed railway (ballast track) and post-construction settlement of 5 cm after eight months of ending filling. This provides the reliable data and reference basis for design, construction and quality check of reinforcing subgrade in deep soft soil zone and provides the experience of building passenger dedicated railway line in soft soil zone.
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Received: 21 September 2005
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2006, Vol. 23 
