Stability calculations in jointed rock mass

Dissertation

Olli Halonen

Research output: ThesisDissertationMonograph

1 Citation (Scopus)

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 languageEnglish
QualificationDoctor Degree
Awarding Institution
  • Helsinki University of Technology
Supervisors/Advisors
  • Matikainen, Raimo, Supervisor, External person
Award date24 Nov 1989
Place of PublicationEspoo
Publisher
Print ISBNs951-38-3563-4
Publication statusPublished - 1989
MoE publication typeG4 Doctoral dissertation (monograph)

Fingerprint

Rocks
Shear stress
Stiffness matrix
Shear strength
Thermodynamic properties
Testing
Hot Temperature

Keywords

  • rock mechanics
  • subsurface structures
  • joint element
  • finite element analysis
  • computer programs
  • normal stress
  • shear stress
  • calculations

Cite this

Halonen, O. (1989). Stability calculations in jointed rock mass: Dissertation. Espoo: VTT Technical Research Centre of Finland.
Halonen, Olli. / Stability calculations in jointed rock mass : Dissertation. Espoo : VTT Technical Research Centre of Finland, 1989. 89 p.
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author = "Olli Halonen",
year = "1989",
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series = "Publications / Technical Research Centre of Finland",
publisher = "VTT Technical Research Centre of Finland",
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Halonen, O 1989, 'Stability calculations in jointed rock mass: Dissertation', Doctor Degree, Helsinki University of Technology, Espoo.

Stability calculations in jointed rock mass : Dissertation. / Halonen, Olli.

Espoo : VTT Technical Research Centre of Finland, 1989. 89 p.

Research output: ThesisDissertationMonograph

TY - THES

T1 - Stability calculations in jointed rock mass

T2 - Dissertation

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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 - 951-38-3563-4

T3 - Publications / Technical Research Centre of Finland

PB - VTT Technical Research Centre of Finland

CY - Espoo

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Halonen O. Stability calculations in jointed rock mass: Dissertation. Espoo: VTT Technical Research Centre of Finland, 1989. 89 p.