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Laboratory measurements of reservoir rock from the geysers geothermal field, California
73A
Geomechanics Abstracts
vslent material properties can be used in computations to predict stress distributions. Having obtained these stresses in the equiw~lent .material, equations are given that enable conversion to stresses in the individual layer materials. It is suggested that the orthorhombic layer theory developed can be "adapted for other
General 824001 LEJ<~T-SQUARES FITUI~G OF THE LINEAR MOHR ENVELOPE. TEC}D~IC?J~ NOTE Lisle, R J; ~trom, C 0 J Engng Geol, VI5, ~Yl, 1982, P55-56 Describes a procedure for calculating the bestfitting straight Mohr envelope. 824002 AUTOCraTIC REZO}YING ~kND SLIDE LINES IN A Z~JODI~4ENSIONAL L~GRANGIAN FINITE DIFFERENCE CODE Cooper, T S~edish Detonlc Research Fonr~atlon report DS 19~i:15~ 27 Nov 1981, 22P Follow-up of an ee~lier report by the author (see item 821059)° AvslI: The Fottndation, Box 32058, S-126 ii Stockholm, ~wede n
Properties of Rocks and Soils 824003 L%BORATORY ![FJ.SURN~[ENTS OF RESERVOIR ROCK FROM THE~ GEYsT~s CEOTHERMF~L FIELD, CALIFORNIA Lockner, D A; Stm~ers, R; Moore~ D Int J Rock Mech Min Sci, VI9, N2, April 1982,
P65-60
824oo5
ELASTIC MODELS OF ROCK M A S ~ S K&VING ONE, TWO AND THREE SETS OF JOINTS Gerrard, C M Int J Rock Meeh Min Sci, V]9, NIj Feb 1982, P15-23 The theory of orthorhombic layers is successively applied to analyse the stress-defo~uation behaviour of rock masses containing one, two, and three sets of Joints. The joints in each set are assumed to he planar and to be approximately equally spaced. ~Tnere more than one set of joints is present these are assumed to be mutually perpendicular~ The stress-deformation properties of a particul~r jointed rock mass are described in terms of sn 'equivalent' homogeneous orthorhombic material. The case where the rock and joint materimls are isotropic and have the same value of Poisson's ratio is examined, also the conditions produced when the joints are very thin and very soft relative to the dimensions ~rd stiffness of the rock material.
824006 MglMBRANE PE~[HTRATION IN TRIAXIAL TESTS. TECHNICAL NOTE Ramana, K V; RaJu, V S J Geotech Engng Div ASCE, V]08, ~GT2, Feb
1982, P305-310 Rock s~nples taken from two outcrops and borehole cores at the Geyser geothermal field 3 California, USA, were tested at temperatures and pressures si~Tllar to in sltu conditions. Thin-section and X r'~y ar~alysis was used to provide composit i o ~ l information and degree of alteration° Constant strain rate tests were carried out to deterrmine strength ch~racteristics. Experiments to monitor acoustic emission generated during injection and remowml of water were also carried out. 824004 EQUIVI~AENT ELQBTIC MODULI OF A ROCK MASS CON/~ISTI}~ OF 0RTHORH(~,~IC LAYERS G~rr}md, C M Int J Rock Meeh ',in Sci 3 VI9, }Ylj Feb 1982, Pg-] 4 A stratified rock mass is considered to consist of a series of parallel layers each of which has orthorhombic elastic properties. Expressions for the properties of an 'equivalent' material are given in terms of the elastic properties of the constituent layers. Example results are plotted for ~ range of simple cases. The equl-
Available data has been a~Jlysed to produce an expression to predict volume changes in triaxial tests due to the membr~ne penetration effect. It is concluded that membr~ne penetration is influenced by grain size, geometry of s~mple, and that the effect can be reduced by using large diameter test supples. 824007 NASLIDEN PROJECT - ROCK !/AzS I?~ESTIGATIONS Stephans son, 0 Proc Conference on the Applie~tion of Rock Mechanics to Cut and Fill Mining, Lulea, 1-3 June 1980, P145-161. Pnbl London: I!.~I, The geology of the district and the Nasliden area is described, including the folds, faults and Joints at the mine. A new geomechanlcal model is presented in which the rock mass is treated as an elastic, composite material. The Joints are treated as weak l~mlnae in a strong matrix of rock. Basic equations for 2 crossing sets of Joints are presented and applied to the rock mass of the Nasliden mine. The model is to provide data for input to the finite element analysis.
Geomechanics Abstracts
vslent material properties can be used in computations to predict stress distributions. Having obtained these stresses in the equiw~lent .material, equations are given that enable conversion to stresses in the individual layer materials. It is suggested that the orthorhombic layer theory developed can be "adapted for other
General 824001 LEJ<~T-SQUARES FITUI~G OF THE LINEAR MOHR ENVELOPE. TEC}D~IC?J~ NOTE Lisle, R J; ~trom, C 0 J Engng Geol, VI5, ~Yl, 1982, P55-56 Describes a procedure for calculating the bestfitting straight Mohr envelope. 824002 AUTOCraTIC REZO}YING ~kND SLIDE LINES IN A Z~JODI~4ENSIONAL L~GRANGIAN FINITE DIFFERENCE CODE Cooper, T S~edish Detonlc Research Fonr~atlon report DS 19~i:15~ 27 Nov 1981, 22P Follow-up of an ee~lier report by the author (see item 821059)° AvslI: The Fottndation, Box 32058, S-126 ii Stockholm, ~wede n
Properties of Rocks and Soils 824003 L%BORATORY ![FJ.SURN~[ENTS OF RESERVOIR ROCK FROM THE~ GEYsT~s CEOTHERMF~L FIELD, CALIFORNIA Lockner, D A; Stm~ers, R; Moore~ D Int J Rock Mech Min Sci, VI9, N2, April 1982,
P65-60
824oo5
ELASTIC MODELS OF ROCK M A S ~ S K&VING ONE, TWO AND THREE SETS OF JOINTS Gerrard, C M Int J Rock Meeh Min Sci, V]9, NIj Feb 1982, P15-23 The theory of orthorhombic layers is successively applied to analyse the stress-defo~uation behaviour of rock masses containing one, two, and three sets of Joints. The joints in each set are assumed to he planar and to be approximately equally spaced. ~Tnere more than one set of joints is present these are assumed to be mutually perpendicular~ The stress-deformation properties of a particul~r jointed rock mass are described in terms of sn 'equivalent' homogeneous orthorhombic material. The case where the rock and joint materimls are isotropic and have the same value of Poisson's ratio is examined, also the conditions produced when the joints are very thin and very soft relative to the dimensions ~rd stiffness of the rock material.
824006 MglMBRANE PE~[HTRATION IN TRIAXIAL TESTS. TECHNICAL NOTE Ramana, K V; RaJu, V S J Geotech Engng Div ASCE, V]08, ~GT2, Feb
1982, P305-310 Rock s~nples taken from two outcrops and borehole cores at the Geyser geothermal field 3 California, USA, were tested at temperatures and pressures si~Tllar to in sltu conditions. Thin-section and X r'~y ar~alysis was used to provide composit i o ~ l information and degree of alteration° Constant strain rate tests were carried out to deterrmine strength ch~racteristics. Experiments to monitor acoustic emission generated during injection and remowml of water were also carried out. 824004 EQUIVI~AENT ELQBTIC MODULI OF A ROCK MASS CON/~ISTI}~ OF 0RTHORH(~,~IC LAYERS G~rr}md, C M Int J Rock Meeh ',in Sci 3 VI9, }Ylj Feb 1982, Pg-] 4 A stratified rock mass is considered to consist of a series of parallel layers each of which has orthorhombic elastic properties. Expressions for the properties of an 'equivalent' material are given in terms of the elastic properties of the constituent layers. Example results are plotted for ~ range of simple cases. The equl-
Available data has been a~Jlysed to produce an expression to predict volume changes in triaxial tests due to the membr~ne penetration effect. It is concluded that membr~ne penetration is influenced by grain size, geometry of s~mple, and that the effect can be reduced by using large diameter test supples. 824007 NASLIDEN PROJECT - ROCK !/AzS I?~ESTIGATIONS Stephans son, 0 Proc Conference on the Applie~tion of Rock Mechanics to Cut and Fill Mining, Lulea, 1-3 June 1980, P145-161. Pnbl London: I!.~I, The geology of the district and the Nasliden area is described, including the folds, faults and Joints at the mine. A new geomechanlcal model is presented in which the rock mass is treated as an elastic, composite material. The Joints are treated as weak l~mlnae in a strong matrix of rock. Basic equations for 2 crossing sets of Joints are presented and applied to the rock mass of the Nasliden mine. The model is to provide data for input to the finite element analysis.