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Stability of an undrained plane strain heading revisited Charles E. Augardea,
 

Summary: Stability of an undrained plane strain heading revisited
Charles E. Augardea,
*, Andrei V. Lyaminb
, Scott W. Sloanb
a
School of Engineering, University of Durham, UK
b
Department of Civil, Surveying and Environmental Engineering, University of Newcastle, NSW 2308, Australia
Received 19 July 2002; received in revised form 25 October 2002; accepted 9 January 2003
Abstract
The stability of an idealised heading in undrained soil conditions is investigated in this paper. The heading is rigidly supported
along its length, while the face, which may be pressurised, is free to move. The problem approximates any flat wall in an under-
ground excavation. Failure of the heading is initiated by a surface surcharge, acting with the self-weight of the soil. Finite element
limit analysis methods, based on classical plasticity theory, are used to derive rigorous bounds on load parameters, for a wide range
of heading configurations and ground conditions. Solutions for undrained soils with constant strength, and increasing strength with
depth are presented. Recent improvements to finite element limit analysis methods, developed at the University of Newcastle, have
allowed close bounds to be drawn in most cases. Previous research in this area has often been presented in terms of a stability ratio,
N that combines load and self-weight into a single parameter. The use of a stability ratio for this problem is shown not to be rig-
orous, a finding that may be applicable to other stability problems in underground geomechanics.
# 2003 Elsevier Science Ltd. All rights reserved.

  

Source: Augarde, Charles - School of Engineering, University of Durham

 

Collections: Engineering