›› 2013, Vol. 34 ›› Issue (S2): 428-432.

• Numerical Analysis • Previous Articles     Next Articles

Three-dimensional finite element analysis of geogrid-reinforced embankment supported by X-section cast-in-place piles

CHEN Li-kai1, 2，KONG Gang-qiang1，LIU Han-long1，JIN Hui3   

  1. 1. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China; 2. China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, China; 3. Nanjing Urban Construction Project Building and Management Co., Ltd., Nanjing 210098, China
  • Online:2013-11-11 Published:2013-11-19

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Abstract: Geogrid-reinforced and pile-supported expressway embankment has been widely applied to soft ground improvement; but its bearing and deformation mechanism has not been deeply understood. Combining with the Fourth Yangtze River Bridge’s north-line soft ground reinforced project in Nanjing, the numerical method is used to analyze the variations of settlement and stress of pile and soil, pile axial force and excess pore water stress. The results show that road embankment load is mainly borne by piles as a result of the soil arching effect. The soil pressures of pile and soil increase with the development of embankment load firstly; and then the pressure of pile continue to increase while the pressure of soil decreases in the consolidation process of soft soil. The pile axial force increases quickly during the process of filling. Negative skin friction develops along most part of X-section cast-in-place pile shaft; and the neutral point ascends firstly; with the consolidation of soil, the depth of the neutral point becomes deeper; then the neutral point position is unaltered at the end of soil consolidation.

Key words: X-section cast-in-place pile, pile-supported reinforced embankment, 3D finite element analysis, negative skin friction, neutral point

CLC Number: 

  • TU 473.1
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