›› 2013, Vol. 34 ›› Issue (S2): 393-399.

• Numerical Analysis • Previous Articles     Next Articles

Numerical analyses of composite foundation of geosynthetic-encased stone columns subjected to vertical loading

CHEN Jian-feng1，TONG Zhen-mei1，LIU Jun-xiu1，FENG Shou-zhong2   

  1. 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Wuhan Guangyi Engineering Consultation Co., Ltd., Wuhan 430074, China
  • Received:2013-03-24 Online:2013-11-11 Published:2013-11-19

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Abstract: A three-dimensional finite element seepage-coupling numerical modeling is performed on a 6m thick soft foundation reinforced by geosynthetic-encasement stone column (GESC) with diameter of 0.8 m. The load transfer mechanism and deformation characteristics of GESC composite foundation subjected to vertical loading and excess pore pressure dissipation are analyzed using the numerical model. Compared to conventional stone column (CSC) composite foundation, the stress concentration ratio (SCR) in GESC composite foundation apparently increases while the excess pore pressure, settlement and column shaft bulging apparently decrease. The performance of GESC is further improved with an increase of geosynthetic stiffness. An apparent differential settlement between column and surrounding soil emerges to form a soil arching during consolidation of the surrounding soil, which leads to little change in SCR values after loading. Reinforcement length is found to have a significant influence on SCR and settlement in GESC composite foundation. Full length reinforcement is required for GESCs in composite foundation to assure their entire stiffness and less settlement.

Key words: geosynthetic-encased stone column, composite foundation, soft clay, consolidation, numerical analysis

CLC Number: 

  • TU 473
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