›› 2011, Vol. 32 ›› Issue (S1): 636-0641.

• Numerical Analysis • Previous Articles     Next Articles

Application of strength reduction FEM to stability analysis of high fill slope in Kunming new airport

CHEN Jin-feng1, 2, SONG Er-xiang1, XU Ming1   

  1. 1. Department of Civil Engineering, Tsinghua University, Beijing 100084, China; 2. Institute of Architectural Design and Research, Logistic Engineering University, Chongqing 400041, China)
  • Received:2011-03-10 Online:2011-05-15 Published:2011-05-16

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Abstract: Two kinds of ground treatment methods, gravel piles and dynamic replacement methods, are introduced, which are the most popular treatments at high fill foundation of airport in mountainous area. Comparative studies are carried out by the strength reduction FEM to analyze slope stability of 79-79? engineering geological profile in Kunming new airport under different ground treatments. Comparison between the outcome of stability analysis calculated by FEM and that calculated by simplified Bishop method is also implemented. Moreover, without reducing soil strength parameters, comparative studies of displacements and shear strains of the slope under different ground treatments are performed. The results show that the disposal of the relative soft foundation within slope toe with gravel piles or dynamic replacement method can not only enhance slope safety factor effectively, but also reduce maximum displacements and shear strains by leaps and bounds. Furthermore, safety factors and the most dangerous sliding surfaces calculated by the strength reduction FEM are close to that calculated by simplified Bishop method, when the most dangerous sliding surfaces are close to arc shape. And safety factors, calculated by the strength reduction FEM, are conservative as they are slightly smaller than those calculated by simplified Bishop method. Finally, gravel pile method is better than dynamic replacement method when the coating over moderately weathered bedrock is deeper than the treatment depth of dynamic replacement.

Key words: high fill slope, strength reduction FEM, stability analysis, comparative studies, ground treatment, gravel piles method, dynamic replacement method

CLC Number: 

  • TU 43
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