EFFECT OF GROUND PLASTIFICATION AROUND A TUNNEL ON SURFACE SETTLEMENTS

INFLUENCIA DE LA PLASTIFICACION DEL TERRENO ALREDEDOR DE UN TUNEL EN LOS ASIENTOS SUPERFICIALES

Studies have been made of the problem of subsidence caused by the excavation of circular tunnels close to ground level. The finite element non-dimensional, theoretical analysis assumes that the ground will behave according to an elastic pattern. However, the plastification and dilatancy of the ground must also be taken into consideration since these factors alter the stress-strain behaviour of the ground surrounding the excavation. This paper puts forward some results obtained in some special cases and considers the introduction of the possible ground plastification in the calculations by means of analytical and numerical procedures. Among these, the solutions of Kisiel, Reyes and Deers are discussed. The finite element method was used and the rheological behaviour of the soil was considered to correspond to that of an elastoplastic medium, which need not conform to the law of normal behaviour. Several figures show the effect of soil cohesion on the plastified area, ground level settlements and settlements on tunnel roof. /TRRL/

• Corporate Authors:

  Ministry of Public Works, Spain

  Calle Alfonso XII 3
  Madrid 7,   Spain 
• Authors:
  • SAGASETA, C
  • Oteo, C
• Publication Date: 1975-5

Language

• Spanish

Media Info

• Features: Figures; References;
• Pagination: p. 76-79
• Serial:
  • Publication of: Ministry of Public Works, Spain
  • Publisher: Ministry of Public Works, Spain

Subject/Index Terms

• TRT Terms: Analysis; Conferences; Deformation; Deformation curve; Dilatancy; Elasticity (Mechanics); Finite element method; Geological surveying; Ground settlement; Plasticity; Rheological properties; Rheology; Soil mechanics; Soils; Stresses; Subsidence (Geology); Subsoil; Swelling; Theory; Tunneling; Tunnels
• Geographic Terms: Spain
• Old TRIS Terms: Soil plasticity; Subsoil analysis
• ITRD Terms: 8525: Conference; 5595: Deformation; 5912: Elasticity; 6490: Finite element method; 5922: Plasticity; 5442: Rheology; 5792: Settlement; 8105: Spain; 5575: Stress (in material); 2930: Subsoil; 5203: Swelling (soil); 3374: Tunnel
• Subject Areas: Bridges and other structures; Design; Geotechnology; Highways; I25: Design of Tunnels; I43: Rock Mechanics;

Filing Info

• Accession Number: 00131784
• Record Type: Publication
• Source Agency: Transportation & Soil Mechanics Laboratory, Spain
• Report/Paper Numbers: Conf Paper
• Files: ITRD, TRIS
• Created Date: Jun 5 1976 12:00AM