Numerical Analysis for Steps Excavation Schemes of Old Embankment in Highway-Widening Engineering

In expansion and renovation engineering of old highways, due to the different soil material parameters between the new and old embankment, consolidation degree of foundation and other aspects, widening embankments tends to produce superior differential deformation at its junction, leading to the destruction of the subgrade and pavement structure. In engineering practice, step excavation is often used to make the new and old embankment to fit into a whole in their combination, thereby reducing the differential settlement. In order to explore the deformation characteristics between new and old embankments of each construction plans, this article is based on finite element software of PLAXIS to implement elastic-plastic finite element analysis on each excavation scheme at the junction of widening engineering, calculating different deformation between the new and old embankment, and putting forward the reasonable construction scheme through comparative analysis. The finite element calculation results of typical cross-section indicate that the differential deformation is closely related to excavation scheme. The greater amount of unloading and loading at the junction, the larger horizontal and vertical different deformation will produce between the embankments. With excavation methods of small step (step width is 150cm) and big step (step width is 300~450cm), the differential deformation between the new and old embankment is not significant when the height of embankment is less than 5m, big step can be used to facilitate the construction. But when the height of embankment is greater than 5m, method of big step will produce great differential deformation, small step is preferred.

• Record URL:
  • https://doi.org/10.1061/9780784413159.305
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9780784413159
• Supplemental Notes:
  • © 2013 American Society of Civil Engineers.
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Yang, Lin
  • Zheng, Lixiao
• Conference:
  • Fourth International Conference on Transportation Engineering
  • Location: Chengdu , China
  • Date: 2013-10-19 to 2013-10-20
• Publication Date: 2013-10

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: pp 2094-2099
• Monograph Title: ICTE 2013: Safety, Speediness, Intelligence, Low-Carbon, Innovation

Subject/Index Terms

• TRT Terms: Cross sections; Differential settlement; Embankments; Excavation; Finite element method; Numerical analysis; Pavement widening; Subgrade (Pavements)
• Subject Areas: Bridges and other structures; Construction; Geotechnology; Highways; I24: Design of Bridges and Retaining Walls; I42: Soil Mechanics;

Filing Info

• Accession Number: 01522602
• Record Type: Publication
• ISBN: 9780784413159
• Files: TRIS, ASCE
• Created Date: Apr 22 2014 4:07PM