Abstract
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) 
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Keywords
 rock mechanics
 subsurface structures
 joint element
 finite element analysis
 computer programs
 normal stress
 shear stress
 calculations
Cite this
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Stability calculations in jointed rock mass : Dissertation. / Halonen, Olli.
Espoo : VTT Technical Research Centre of Finland, 1989. 89 p.Research output: Thesis › Dissertation › Monograph
TY  THES
T1  Stability calculations in jointed rock mass
T2  Dissertation
AU  Halonen, Olli
PY  1989
Y1  1989
N2  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.
AB  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.
KW  rock mechanics
KW  subsurface structures
KW  joint element
KW  finite element analysis
KW  computer programs
KW  normal stress
KW  shear stress
KW  calculations
M3  Dissertation
SN  9513835634
T3  Publications / Technical Research Centre of Finland
PB  VTT Technical Research Centre of Finland
CY  Espoo
ER 