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Influence of rock mass fracturing on the measurement of deformability by borehole expansion tests
175A
865045 Mechanical response of jointed granite during shaft sinking at the Canadian Underground Research Laboratory Chan, T; Lang, P A: Thompson, P M In: Research and Engineering Applications in Rock Masses (paper to the 26th US Symposium on Rock Mechanics, Rapid City, 26-28 June 1985) V2. P785-794. Publ Rotterdam: A. A. Balkema, 1985 During the sinking of a 255m deep, 2.8m x 4.9m shaft in the granitic Lac du Bonnet batholith, Canada, rock displacement and stress changes at a depth of 15m were monitored as the excavation face advanced. The aims were to assess the ability of three dimensional finite element modelling to predict the mechanical response of the rock mass, to back calculate deformation modulus as a function of depth, to assess the effects of natural fractures on the rock mass response and to evaluate the suitability of the instrumentation used for measurements of this type.
865046 Observations of borehole deformation modulus values before and after extensive heating of a granitic rock mass Patrick, W C; Yow, J L; Axelrod, M C In: Research and Engineering Applications in Rock Masses (paper to the 261h US Symposium on Rock Mechanics, Rapid
City, 26-28 June 1985) V2, P851-858. Publ Rotterdam: A. A. Balkema, 1985 In situ deformation modulus was measured using a standard NX borehole jack in a granite extrusive, both before and after the rock mass temperature was raised to 10-40 deg C above ambient. Covariate statistical analysis of the results showed deformability to be affected by heating, loading direction and position within the borehole. A significant interaction between the effects of heating and loading direction was also found. A criterion for screening out measurements where rock-jack platen contact is incomplete, as proposed in the draft standard for measuring deformability with the NX jack, was examined and found ineffective.
865047 Influence of rock mass fracturing on the measurement of deformability by borehole expansion tests Amadei, B In: Research and Engineering Applications in Rock Masses
(paper to the 26th US Symposium on Rock Mechanics, Rapid City, 26-28 June 1985) V2, P859-867. Pub/Rotterdam: A. A. Balkema. 1985 An analytical model is proposed for the measurement of deformability using dilatometers and borehole jacks, it explains the variability of apparent modulus of an anisotropic rock mass measured at different points along a borehole wall. The modulus depends on the anisotropic properties of the rock, and their orientation with respect to the borehole and loading directions. It is applicable to a jointed rock mass provided the rock may be modelled as an equivalent linearly elastic continuum. The fracture frequency of a regularly jointed rock mass may be calculated from borehole measurements using this analysis.
865048 ln-situ determination of elastic coet~cients of rock mass Pan Li-Zhou In: Research and Engineering Applications in Rock Masses
(paper to the 261h US Symposium on Rock Mechanics, Rapid City, 26-28 June 1985) V2, P869-871. Publ Rotterdam: A. A. Balkema, 1985 A series of tests is described for the in situ measurement of Young's modulus and Poisson's ratio in boreholes in a rock mass. Error analysis of the sets of results is used to produce the best numerical values of the elastic constants.
865049 Some laboratory and field deformation modulus results and their application to a practical problem Richards, D P; Hustrulid, W A In: Research and Engineering Applications in Rock Masses (paper to the 26th US Symposium on Rock Mechanics, Rapid City, 26-28 June 1985) ~ , P873-882. Publ Rotterdam: A. A. Balkema, 1985 Laboratory compression tests and dynamic and static borehole measurements were used to estimate Young's modulus and deformability of sedimentary rocks at the site of a proposed nuclear power plant. The variability of measurements using different tests is examined and the suitability of the use of 'factors" to convert laboratory measurements to values for on-site use is discussed. It is concluded that expensive, large scale in-situ testing may be justified in certain cases where a high confidence level in the accuracy of parameters is required.
865050 Strategy for future laboratory rock mechanics programs Butcher, B M: Jones, A K In: Research and Engineering Applications in Rock Masses
(paper to the 261h US Symposium on Rock Mechanics, Rapid City, 26-28 June 1985) V2, P883-892. Publ Rotterdam: ,4. A. Balkema, 1985 The development of three dimensional numerical techniques has provided many opportunities for design analysis, but there still remains the problem of demonstrating that numerical solutions are representative of actual in situ response. The current program at Sandia National Laboratories is described, where work is being undertaken to develop laboratory testing techniques to accurately duplicate the in situ stress strain behaviour predicted by design models.
865051 Constitutive relations for concrete and rock: applications and extensions of elasticity and plasticity theory Dougill, J W In: Mechanics of Geomaterials: Rocks, Concrete, Soils (papers to the IUTAM William Prager Symposium, Et,anston, !!-!5 Sept 1983) P21-46. Publ Chichester: John Wiley, 1985 A number of features of theories used to describe the constitutive behaviour of rocks and concrete are reviewed, with special emphasis on path dependence, elasticity, plasticity and the coupling of degradation with plastic deformation. The problems arising in applying the models and in the selection of one model from several which can describe a particular behavioural feature are discussed.
~; 1986 Pergamon Journals Ltd. Reproduction not permitted
865045 Mechanical response of jointed granite during shaft sinking at the Canadian Underground Research Laboratory Chan, T; Lang, P A: Thompson, P M In: Research and Engineering Applications in Rock Masses (paper to the 26th US Symposium on Rock Mechanics, Rapid City, 26-28 June 1985) V2. P785-794. Publ Rotterdam: A. A. Balkema, 1985 During the sinking of a 255m deep, 2.8m x 4.9m shaft in the granitic Lac du Bonnet batholith, Canada, rock displacement and stress changes at a depth of 15m were monitored as the excavation face advanced. The aims were to assess the ability of three dimensional finite element modelling to predict the mechanical response of the rock mass, to back calculate deformation modulus as a function of depth, to assess the effects of natural fractures on the rock mass response and to evaluate the suitability of the instrumentation used for measurements of this type.
865046 Observations of borehole deformation modulus values before and after extensive heating of a granitic rock mass Patrick, W C; Yow, J L; Axelrod, M C In: Research and Engineering Applications in Rock Masses (paper to the 261h US Symposium on Rock Mechanics, Rapid
City, 26-28 June 1985) V2, P851-858. Publ Rotterdam: A. A. Balkema, 1985 In situ deformation modulus was measured using a standard NX borehole jack in a granite extrusive, both before and after the rock mass temperature was raised to 10-40 deg C above ambient. Covariate statistical analysis of the results showed deformability to be affected by heating, loading direction and position within the borehole. A significant interaction between the effects of heating and loading direction was also found. A criterion for screening out measurements where rock-jack platen contact is incomplete, as proposed in the draft standard for measuring deformability with the NX jack, was examined and found ineffective.
865047 Influence of rock mass fracturing on the measurement of deformability by borehole expansion tests Amadei, B In: Research and Engineering Applications in Rock Masses
(paper to the 26th US Symposium on Rock Mechanics, Rapid City, 26-28 June 1985) V2, P859-867. Pub/Rotterdam: A. A. Balkema. 1985 An analytical model is proposed for the measurement of deformability using dilatometers and borehole jacks, it explains the variability of apparent modulus of an anisotropic rock mass measured at different points along a borehole wall. The modulus depends on the anisotropic properties of the rock, and their orientation with respect to the borehole and loading directions. It is applicable to a jointed rock mass provided the rock may be modelled as an equivalent linearly elastic continuum. The fracture frequency of a regularly jointed rock mass may be calculated from borehole measurements using this analysis.
865048 ln-situ determination of elastic coet~cients of rock mass Pan Li-Zhou In: Research and Engineering Applications in Rock Masses
(paper to the 261h US Symposium on Rock Mechanics, Rapid City, 26-28 June 1985) V2, P869-871. Publ Rotterdam: A. A. Balkema, 1985 A series of tests is described for the in situ measurement of Young's modulus and Poisson's ratio in boreholes in a rock mass. Error analysis of the sets of results is used to produce the best numerical values of the elastic constants.
865049 Some laboratory and field deformation modulus results and their application to a practical problem Richards, D P; Hustrulid, W A In: Research and Engineering Applications in Rock Masses (paper to the 26th US Symposium on Rock Mechanics, Rapid City, 26-28 June 1985) ~ , P873-882. Publ Rotterdam: A. A. Balkema, 1985 Laboratory compression tests and dynamic and static borehole measurements were used to estimate Young's modulus and deformability of sedimentary rocks at the site of a proposed nuclear power plant. The variability of measurements using different tests is examined and the suitability of the use of 'factors" to convert laboratory measurements to values for on-site use is discussed. It is concluded that expensive, large scale in-situ testing may be justified in certain cases where a high confidence level in the accuracy of parameters is required.
865050 Strategy for future laboratory rock mechanics programs Butcher, B M: Jones, A K In: Research and Engineering Applications in Rock Masses
(paper to the 261h US Symposium on Rock Mechanics, Rapid City, 26-28 June 1985) V2, P883-892. Publ Rotterdam: ,4. A. Balkema, 1985 The development of three dimensional numerical techniques has provided many opportunities for design analysis, but there still remains the problem of demonstrating that numerical solutions are representative of actual in situ response. The current program at Sandia National Laboratories is described, where work is being undertaken to develop laboratory testing techniques to accurately duplicate the in situ stress strain behaviour predicted by design models.
865051 Constitutive relations for concrete and rock: applications and extensions of elasticity and plasticity theory Dougill, J W In: Mechanics of Geomaterials: Rocks, Concrete, Soils (papers to the IUTAM William Prager Symposium, Et,anston, !!-!5 Sept 1983) P21-46. Publ Chichester: John Wiley, 1985 A number of features of theories used to describe the constitutive behaviour of rocks and concrete are reviewed, with special emphasis on path dependence, elasticity, plasticity and the coupling of degradation with plastic deformation. The problems arising in applying the models and in the selection of one model from several which can describe a particular behavioural feature are discussed.
~; 1986 Pergamon Journals Ltd. Reproduction not permitted