The influence of previous stress history and stress path direction on thesurface settlement trough induced by tunnelling

The pre-failure behaviour of overconsolidated soils is well known to be non-linear and inelastic. Over the last two decades experimental work has shown that pre-failure behaviour is also dependent on the previous stress history of the soil. However, some research has also suggested that, if enough time is allowed for creep to take place, then there is no effect of recent stress history; moreover, what affects soil stiffness is the direction of the stress path relative to the gross yield surface. This paper investigates the effect of two scenarios on the surface settlement trough associated with tunnelling. The first assumes that the previous stress history of the soil has an effect on soil stiffness, whereas the second assumes that creep/ageing periods have erased any memory of the previous stress history, and it is only the stress path direction that influences soil stiffness. A three-surface kinematic hardening model, which can simulate both scenarios, is employed in finite element analyses of tunnel construction. Thepredictions of the kinematic hardening model for the simulation of each scenario are compared with predictions using a non-linear elastic model andwith field measurements. (A)

• Authors:
  • GRAMMATIKOPOULOU, A
  • ZDRAVKOVIC, L
  • POTTS, D M
• Publication Date: 2008

Language

• English

Media Info

• Pagination: 269-281
• Serial:
  • GÉOTECHNIQUE
  • Volume: 58
  • Issue Number: 4

Subject/Index Terms

• TRT Terms: Aging (Materials); Creep; Finite element method; Mathematical models; Motion; Nonlinear systems; Soils; Stiffness; Stresses; Tunnels
• ITRD Terms: 5292: Ageing; 4732: Creep (mater); 6490: Finite element method; 6473: Mathematical model; 5483: Movement; 6482: Non linear system; 4156: Soil; 5931: Stiffness; 5575: Stress (in material); 3374: Tunnel
• Subject Areas: Bridges and other structures; Construction; Geotechnology; I42: Soil Mechanics; I54: Construction of Tunnels;

Filing Info

• Accession Number: 01100191
• Record Type: Publication
• Source Agency: TRL
• Files: ITRD
• Created Date: May 27 2008 9:58AM