Abstract
An isoparametric two dimensional joint element with independent non
linear behaviour models for normal and shear stress has been used to study
different failure criteria and the accuracy of calculations.Testing of the
behaviour models indicated similar results obtained by other researchers with
different finite element codes.JRTEMP is the first finite element program
which can couple joint elements and thermal loading in plane stress, in plane
strain and in axisymmetric cases.Joint normal stress behaviour followed
Goodman's (1976) hyperbolic law for normal stress deformation relationship and
shear behaviour by Barton's (1977) peak shear strength criterion which is a
function of normal stress.All these non linear behaviour models can be used in
conjunction with thermal loading produced by solid elements.Joint elements
have zero thickness and no thermal properties.The failure criteria were
checked at integration points.The state of equilibrium was checked after each
iteration in every load step.The stiffness matrix of the whole calculation was
reformed at the same time.The examples of this study indicate that by
applying non linear model to the behaviour of a joint, at least three
integration points should be used.One point integration might produce big
differences in displacements compared with results achieved by five point
integration.A fluctuating displacement/shear stress effect may also occur.
Original language  English 

Qualification  Doctor Degree 
Awarding Institution 

Supervisors/Advisors 

Award date  24 Nov 1989 
Place of Publication  Espoo 
Publisher  
Print ISBNs  9513835634 
Publication status  Published  1989 
MoE publication type  G4 Doctoral dissertation (monograph) 
Keywords
 rock mechanics
 subsurface structures
 joint element
 finite element analysis
 computer programs
 normal stress
 shear stress
 calculations
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Halonen, O. (1989). Stability calculations in jointed rock mass: Dissertation. VTT Technical Research Centre of Finland.