THERMOCHEMOMECHANICAL ASSESSMENT OF GROUND IMPROVEMENT BY JET GROUTING IN TUNNELING

Horizontal jet grouting (HJG) is employed in urban tunneling to reduce surface settlements and, hence, to avoid damage of infrastructure and surface buildings. The widespread use of HJG raises the question of its efficiency. In order to answer this question, sophisticated thermochemomechanical material models for jet-grouted soil mass and shotcrete are employed in the context of plane-strain finite element analyses. For these analyses, the process of ground improvement, the excavation of the tunnel, and the installation of the shotcrete lining are considered. The results provide first insight into the load-carrying behavior of the compound structure consisting of the jet-grouted soil mass, the shotcrete lining, and the surrounding soil. The influence of the different creep characteristics in jet-grouted soil mass and shotcrete, resulting in a redistribution of loading, is highlighted. Moreover, the reduction of plastic loading of the soil in consequence of HJG, which is described by means of a multisurface viscoplasticity model, is illustrated. Based on the obtained numerical results, application of HJG results in a reduction of surface settlement by more than 50% in comparison to a tunnel which is only supported by a shotcrete lining.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/07339399
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Pichler, C
  • Lackner, R
  • Spira, Y
  • MANG, H A
• Publication Date: 2003-8

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 951-962
• Serial:
  • Journal of Engineering Mechanics
  • Volume: 129
  • Issue Number: 8
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-9399
  • EISSN: 1943-7889
  • Serial URL: http://ascelibrary.org/journal/jenmdt

Subject/Index Terms

• TRT Terms: Material reinforcement; Mechanical analysis; Settlement (Structures); Shotcrete; Soil stabilization; Thermochemistry; Tunnel supports; Tunneling; Underground structures
• Uncontrolled Terms: Horizontal jet grouting
• Subject Areas: Bridges and other structures; Design; Geotechnology; Highways; Planning and Forecasting; I21: Planning of Transport Infrastructure; I42: Soil Mechanics;

Filing Info

• Accession Number: 00961647
• Record Type: Publication
• Files: TRIS
• Created Date: Aug 7 2003 12:00AM