›› 2011, Vol. 32 ›› Issue (4): 1216-1222.

• Numerical Analysis • Previous Articles     Next Articles

Analysis of deformation behavior of expressway widening engineering under different foundation treatments

ZHANG Jun-hui   

  1. Key Laboratory of Highway Engineering of Ministry of Education, Changsha University of Science & Technology, Changsha 410004, China
  • Received:2009-11-26 Online:2011-04-10 Published:2011-04-29

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Abstract:

Due to the rapid increase of traffics, more and more early-built expressways will be reconstructed. There are always several key technical problems for expressway widening on soft foundation, in which determining how to treat the foundation of the new road according to the old road foundation treatment methods is the most important. Effects of the different foundation treatments on road deformation are analyzed numerically according to a practice of expressway widening. Results show that the plastic drainage board used in the new foundation enhances the old road deformation greatly during widening; while the new foundation with composite foundation produce less settlement of the new and old embankment after construction and disturbance to the old road during widening. At the same time, the distribution of the horizontal displacements in foundation provides the theory base for using the stress isolation wall to reduce the deformation of old road resulting from the new embankment. The wall depth depends on the depth of the horizontal displacement concentration zones. In addition, the impact of consolidation degree of the old foundation on the deformation of the existing road during widening is insignificant when the composite foundation is used in the new foundation.

Key words: foundation treatment, widening, differential settlement, horizontal displacement, numerical analysis

CLC Number: 

  • U 412.36+6
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