By using the finite element software of Plaxis,the geosynthetic-reinforced and pile-supported earth platform resting on oversized deep soft soil in Chaoshan Railway Station of Xiamen-Shenzhen High Speed Railway was simulated.The settlement of subgrade,variation of earth pressure,and tensile force distribution of geogrid and so on were investigated.The results showed that the varying law of layers settlement with fill height appeared to be intermittent,and the settlement mainly occured in the underlying stratum; the earth pressure changed gradually and rectified its value throughout the entire construction period; the axial ultimate force of the piles occured on the top of the muddy clay layer in the vertical direction,and the moment and shear of pile body increased from the subgrade center outside in the horizontal direction; the maximum tension of geogrid occured at the edge of caps and the settings of caps contributed to balance the tension in geogrid to avoid stress concentration; the excess pore water pressure increased with increased fill height,which indicated that the upper loads could be effectively transferred from pile body to deep stratum,thus controlling foundation settlement well.
[2] Graeme D. Skinnera R,Kerry Rowe. Design and Behaviour of a Geosynthetic Reinforced Retaining Wall and Bridge Abutment on a Yielding Foundation [J]. Geotexiles and Geomembranes,2005,23(3): 234-260.
饶为国. 桩-网复合地基原理及实践[M]. 北京:中国水利水 电出版社,2004.
[3] Liu H L,Charles W W Ng,Fei K,Performance of a Geogrid- Reinforced and Pile-Supported Highway Embankment over Soft Clay: Case Study [J]. Journal of Geotechnical and Geoenvironmental Engineering,2007,133(12): 1483-1493.
[4] Chen R P,Xu Z Z,Chen Y M,et al. Field Tests on Pile- Supported Embankments over Soft Ground [J]. Journal of Geotechnical and Geoenvironmental Engineering,2010,136(6): 777-785.
[6] Chen R P,Chen Y M,Xu Z Z. A Theoretical Solution for Pile- Supported Embankments on Soft Soils Under One-Dimensional Compression [J]. Canadian Geotechnical Journal,2008,45(5): 611-623.
[7] Bergado D T,Teerawattanasuk C,Youwai S,et al. Finite Element Modeling of Hexagonal Wire Reinforced Embankment on Soft Clay [J]. Canadian Geotechnical Journal,2000,37 (6): 1209-1226.
[8] Le Hello B,Villard P. Embankments Reinforced by Piles and Geosynthetics-Numerical and Experimental Studies Dealing with the Transfer of Load on the Soil Embankment [J]. Engineering Geology,2009,106(1 /2): 78-91.
[9] Oh Young In,Shin Eun Chul. Reinforcement and Arching Effect of Geogrid-Reinforced and Pile-Supported Embankment on Marine Soft Ground [J]. Marine Georesources & Geotechnology,2007,25(2): 97-18.
[16] Han J,Gabr M A. Numerical Analysis of Geosynthetic-Reinforced and Pile-Supported Earth Platforms over Soft Soil [J]. Journal of Geotechnical and Geoenvironmental Engineering,2002,128(1): 44-53.