›› 2011, Vol. 32 ›› Issue (4): 1200-1204.

• Numerical Analysis • Previous Articles     Next Articles

Finite element analyses of creep behaviors of non-reinforced and geogrid-reinforced sands

LI Fu-lin1, 2，PENG Fang-le1，KONGKITKUL W.3，TATSUOKA F.4   

  1. 1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 2. School of Mechanics and Civil Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China; 3. Department of Civil Engineering, King Mongkut's University of Technology Thonburi, Bangkok 10140, Thailand; 4. Department of Civil Engineering, Tokyo University of Science, Chiba 278-8510, Japan
  • Received:2009-12-31 Online:2011-04-10 Published:2011-04-29

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Abstract:

Based on the experimental results of creep tests under step loading in the plane strain compression, the creep behaviors of non-reinforced and geogrid-reinforced sands have been investigated. It is found that the creep deformation is affected by the initial stress level and the initial creep strain rate in a given creep loading stage. When monotonic loading is restarted from the end of each creep loading stage, the stress-strain relation shows a very high tangent stiffness. A nonlinear finite element analysis (FEA) incorporating the unified three-component elasto-viscoplastic constitutive model for both sands and geogrids is developed. The FEA can simulate the whole process including the monotonic loadings at a constant strain rate and the creep loading stages. By comparing the simulated results with the experimental results, it is shown that the developed elasto-viscoplastic FEA can simulate the creep behaviors of non-reinforced and geogrid-reinforced sands very well, especially for the high stiffness following a creep loading stage.

Key words: reinforced sands, geogrids, creep, finite elements, strain rate

CLC Number: 

  • TU 441
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