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Analytical model for the design of grouted rock bolts
Author(s) -
Indraratna B.,
Kaiser P. K.
Publication year - 1990
Publication title -
international journal for numerical and analytical methods in geomechanics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.419
H-Index - 91
eISSN - 1096-9853
pISSN - 0363-9061
DOI - 10.1002/nag.1610140402
Subject(s) - dimensionless quantity , rock mass classification , rock bolt , geotechnical engineering , structural engineering , displacement (psychology) , engineering , deformation (meteorology) , stress (linguistics) , stress field , field (mathematics) , yield (engineering) , homogeneous , geology , finite element method , mechanics , materials science , mathematics , physics , psychology , linguistics , oceanography , philosophy , pure mathematics , psychotherapist , combinatorics , metallurgy
Abstract An analytical model which represents the behaviour of a reinforced rock mass near a circular underground opening in a homogeneous, uniform stress field has been developed. The theory adopts the concepts of elastoplasticity and considers a proper interaction mechanism between the ground and the grouted (or friction) bolts. It highlights the influence of the bolt pattern on the extent of the yield zone and tunnel deformation. A dimensionless parameter is introduced as a design tool which relates the tunnel convergence to the bolt spacing for a given bolt length. This publication contains the derivation of the analytical model and an illustration of the effect of bolts on the stress and displacement field near an opening. Its application to tunnel design is discussed briefly. The verification of the theory by laboratory simulation and field measurements will be presented, in detail, in a future publication.