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  4. Stresses and displacements in steel-lined pressure tunnels and shafts in anisotropic rock under quasi-static internal water pressure
 
research article

Stresses and displacements in steel-lined pressure tunnels and shafts in anisotropic rock under quasi-static internal water pressure

Pachoud, Alexandre Jean  
•
Schleiss, Anton  
2016
Rock Mechanic and Rock Engineering

Steel-lined pressure tunnels and shafts are constructed to convey water from reservoirs to hydroelectric power plants. They are multilayer structures made of a steel liner, a cracked backfill concrete layer, a cracked or loosened near-field rock zone and a sound far-field rock zone. Designers often assume isotropic behavior of the farfield rock, considering the most unfavorable rock mass elastic modulus measured in situ, and a quasi-static internal water pressure. Such a conventional model is thus axisymmetrical and has an analytical solution for stresses and displacements. However, rock masses often have an anisotropic behavior and such isotropic assumption is usually conservative in terms of quasi-static maximum stresses in the steel liner. In this work, the stresses and displacements in steel-lined pressure tunnels and shafts in anisotropic rock mass are studied by means of the finite element method. A quasi-static internal water pressure is considered. The materials are considered linear elastic, and tied contact is assumed between the layers. The constitutive models used for the rock mass and the cracked layers are presented and the practical ranges of variation of the parameters are discussed. An extensive systematic parametric study is performed and stresses and displacements in the steel liner and in the far-field rock mass are presented. Finally, correction factors are derived to be included in the axisymmetrical solution which allow a rapid estimate of the maximum stresses in the steel liners of pressure tunnels and shafts in anisotropic rock.

  • Details
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Type
research article
DOI
10.1007/s00603-015-0813-z
Web of Science ID

WOS:000373158200010

Author(s)
Pachoud, Alexandre Jean  
Schleiss, Anton  
Date Issued

2016

Publisher

Springer Wien

Published in
Rock Mechanic and Rock Engineering
Volume

49

Issue

4

Start page

1263

End page

1287

Subjects

Steel liner

•

Anisotropy

•

Transversely isotropic rock

•

Pressure tunnels and shafts

•

Finite element method

•

Water pressure

Note

[1066]

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
PL-LCH  
Available on Infoscience
May 17, 2016
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/126154
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