On the non‐linear ‘squeezing’ effects around circular tunnels
作者:
Giancarlo Gioda,
期刊:
International Journal for Numerical and Analytical Methods in Geomechanics
(WILEY Available online 1982)
卷期:
Volume 6,
issue 1
页码: 21-46
ISSN:0363-9061
年代: 1982
DOI:10.1002/nag.1610060104
出版商: John Wiley&Sons, Ltd
数据来源: WILEY
摘要:
AbstractAn analysis is presented of the non‐linear creep effects around a deep circular tunnel driven in ‘squeezing’ ground. The time‐dependent behaviour of the geotechnical medium is described by means of a simple viscoplastic rheological model capable of approximating primary, secondary and tertiary creep behaviours. It is shown that tertiary creep can be allowed for by providing a suitable law governing the variation of some material parameters (such as viscosity) with stresses and strains. The basic operations of the ‘evolutive’ procedure adopted for time integration are outlined. Along each time integration step, quadratic variations of the stress and strain fields and linear variations of the material parameters are assumed. The results of various finite element analyses are presented concerning both lined and unlined cases. For the lined cases, the influence of the liner stiffness and of the time elapsed between the end of excavation and the liner installation is
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