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Strength and grade relationships for a copper-zinc sulphide ore
5~
Strength characteristics See also: 783205
783021
SHEAR STRENSTH OF ROCK JOINES IN THEORY AND PRACTICE Barton, N; Choubey, V Rock Mech, VI0, Ni-2, Dec 1977, PI-5~ The paper describes an empirical law of friction for rock Joints which can be used both for extrapolating and predicting sheer strer6th data. The equation is based on three i m d ~ parameters; the Joint r o ~ s s coefficient J R % the Joint wall compressive strez~th JCS, and the residual friction ar~e. All these irzlex values can be measured in the laboratory, or in the field. Imde~ tests and subsequent shear box teats on mc~e Taham i00 Joint samples have d~nomstrated that the resid~al friction angle can be estimated to within i deg for ar~ one of the eig~ht rock types investigated. The mean value of the peak shear strength angle for the same i00 Joints was estimated to within i/2 de~. The excep~ionally close prediction of peak strength is mnd e possible by performing self-weig~ht(icw stress) sliding teats on blocks with throughgoing Joints. The total friction angle at which sliding occurs provides an estimate of the Joint rotw,hness coefficient JRC, constant over a range of effective normal stress of at least four o r d ~ s of magmittzle. However, both JRC and JCS reduce with increasing Joint length. Imereaslng the length of Joint therefore reduces not only the peak shear stremgth, but alsO the peak dilation angle ard the peak shear stiffness. These important scale effects can be predicted at a fraction of the cost of performing large scale in situ direct shear tests.
research was based o n the assumption that a part of the scattering of stremg~-h-grade data could be correlated with variations in ~ chemical a m ~ e r mineralogical compositions of the samples. The results demonstrate clear relationships between strer6%hs in tension amd compression ard the zinc-iron contents of the rocks~ Auth. 783025 LONG-TEF~4 STRENGTH OF ROCK Sir4/%, D P Colliery Girard, V225, Nil, Nov 1977, P~61-866 Long term stremgth of rock is defir~d ar~ methods of its determination ere reviewed, incltzllng direct and indirect methods. Indirect methods ere creep testsj volumetric strainj io~ stress-log strainj stress-strain rate, loading rate and sonic methods.
Deformation characteristics 783026 USE OF THE CONE PENETRCMETER TO DETERMINE THE PLASTIC LIMIT OF SOILS WOOd, D M; Wroth, C P Ground Emgng, Vll, N3, April 1978, I>37 783027 P R E S S ~ TESTS IN SANDS Hughes, J M O; Wroth~ C P; Wi~dle, D Geotechnique, V27, N4, Dec 1977, I~55-477 A self-bc~ing pressuremeter used to obtain in situ measurement of the properties of sands is described. A new interpretation of pressu~emeter tests which allows for dilstsm~y of sand during shearing is presented, and used to calculate the angle of interr~l friction and angle of dilatation from field results fcom t..'osites. Values of shear modulus er~ in situ horizontal stress are also reported.
733022 NATURAL ROCK ALTERATIONS - PROBLD4S IN HIGHWAY CONSTRUCTION AND TUNNelLING (IN GERMAN) Holler, H; Hc~nn, O; Kolmerj H Rock Mechj VI0, Ni-2, Dec 1977, I>73-80 Examines the effect of alterations such as mineral dissolution, mineral alteration and mineral formation on rock mass strength, with examples from the construction of the Sudautobahn in the Pack area of Styria, Austria. 783023 M~MBRANE PENETRATION AND ITS EFFECT ON PORE PRESSURES Kickbusch, M; Schuppener, B J Geotech Engng Div ASCE, VI03, NG'flI, 1977 , P1267-1279 An apparatus is described to measure the volume charges due to membrane penetration into the interstices of a specimen of sar~ or silt with changing pressures on the membrane. Membrane penetration increases non-linearly with mean grain size. Membrane penetration may be reduced by treating the membrane with a thin layer of liquid rubber which is pressed into the soll interstices. With the normal use of membranes, pore pressures will be urder-estimated ard undrained shear strengths over-estimated.
783024 STRENGTH AND GRADE RELATIONSHIPS FOR A COPPER-ZINC SULPHIDE ORE Udd, J E; Caron, M; Gasps, D CIM Bull, VTO, N78~, Aug 1977, PI02-I08 A core sample for this study was taken from the sull~hide ore of the Geco Mine. The subsequent
783028 ALGEBRAIC EVALUATION OF ~ O - D I ~ N S I O N A L FINITE STRAIN R O ~ S Sanderson, D J J Int Ass Math Geol, Vg, NS, Oct 1977, m83-~% Discus~3es bhe Use of algebraic solutions to replace Mohr construction, the solution of a~gular changes in strain rosettes, amd the treatment of overdstermined strain rosettes. Simple examples of the algebraic solution of strain rosette dE~b~are given ar~l, where possible, previously published problems are used to facilitate comparison with Mohr circle solutions 783029 MEASURING THE COEFFICIENT OF INgERNAL FRICTION FOR SOIL IN SPHERICALLY ~ T R I C PLASTIC FLOW Kolkov, 0 S SOV Min Sci, VI3, NI, Jan-Feb 1977, P21-24 783030 D~GRMATION MECHANISM OF LOOSE MATERIAL Katashinskii, V P; Vinogradov, G A; Rukhailo, N V SOy Min Sci, V12, N6, Nov-Dec 1976, P573-576 Reports an investigation of shear deformation of grar~ar materials using x-ray radiography to visualise slip surface,;. "~+U~erials used were aluminium powder, boron carbide powder and s~nd.
Strength characteristics See also: 783205
783021
SHEAR STRENSTH OF ROCK JOINES IN THEORY AND PRACTICE Barton, N; Choubey, V Rock Mech, VI0, Ni-2, Dec 1977, PI-5~ The paper describes an empirical law of friction for rock Joints which can be used both for extrapolating and predicting sheer strer6th data. The equation is based on three i m d ~ parameters; the Joint r o ~ s s coefficient J R % the Joint wall compressive strez~th JCS, and the residual friction ar~e. All these irzlex values can be measured in the laboratory, or in the field. Imde~ tests and subsequent shear box teats on mc~e Taham i00 Joint samples have d~nomstrated that the resid~al friction angle can be estimated to within i deg for ar~ one of the eig~ht rock types investigated. The mean value of the peak shear strength angle for the same i00 Joints was estimated to within i/2 de~. The excep~ionally close prediction of peak strength is mnd e possible by performing self-weig~ht(icw stress) sliding teats on blocks with throughgoing Joints. The total friction angle at which sliding occurs provides an estimate of the Joint rotw,hness coefficient JRC, constant over a range of effective normal stress of at least four o r d ~ s of magmittzle. However, both JRC and JCS reduce with increasing Joint length. Imereaslng the length of Joint therefore reduces not only the peak shear stremgth, but alsO the peak dilation angle ard the peak shear stiffness. These important scale effects can be predicted at a fraction of the cost of performing large scale in situ direct shear tests.
research was based o n the assumption that a part of the scattering of stremg~-h-grade data could be correlated with variations in ~ chemical a m ~ e r mineralogical compositions of the samples. The results demonstrate clear relationships between strer6%hs in tension amd compression ard the zinc-iron contents of the rocks~ Auth. 783025 LONG-TEF~4 STRENGTH OF ROCK Sir4/%, D P Colliery Girard, V225, Nil, Nov 1977, P~61-866 Long term stremgth of rock is defir~d ar~ methods of its determination ere reviewed, incltzllng direct and indirect methods. Indirect methods ere creep testsj volumetric strainj io~ stress-log strainj stress-strain rate, loading rate and sonic methods.
Deformation characteristics 783026 USE OF THE CONE PENETRCMETER TO DETERMINE THE PLASTIC LIMIT OF SOILS WOOd, D M; Wroth, C P Ground Emgng, Vll, N3, April 1978, I>37 783027 P R E S S ~ TESTS IN SANDS Hughes, J M O; Wroth~ C P; Wi~dle, D Geotechnique, V27, N4, Dec 1977, I~55-477 A self-bc~ing pressuremeter used to obtain in situ measurement of the properties of sands is described. A new interpretation of pressu~emeter tests which allows for dilstsm~y of sand during shearing is presented, and used to calculate the angle of interr~l friction and angle of dilatation from field results fcom t..'osites. Values of shear modulus er~ in situ horizontal stress are also reported.
733022 NATURAL ROCK ALTERATIONS - PROBLD4S IN HIGHWAY CONSTRUCTION AND TUNNelLING (IN GERMAN) Holler, H; Hc~nn, O; Kolmerj H Rock Mechj VI0, Ni-2, Dec 1977, I>73-80 Examines the effect of alterations such as mineral dissolution, mineral alteration and mineral formation on rock mass strength, with examples from the construction of the Sudautobahn in the Pack area of Styria, Austria. 783023 M~MBRANE PENETRATION AND ITS EFFECT ON PORE PRESSURES Kickbusch, M; Schuppener, B J Geotech Engng Div ASCE, VI03, NG'flI, 1977 , P1267-1279 An apparatus is described to measure the volume charges due to membrane penetration into the interstices of a specimen of sar~ or silt with changing pressures on the membrane. Membrane penetration increases non-linearly with mean grain size. Membrane penetration may be reduced by treating the membrane with a thin layer of liquid rubber which is pressed into the soll interstices. With the normal use of membranes, pore pressures will be urder-estimated ard undrained shear strengths over-estimated.
783024 STRENGTH AND GRADE RELATIONSHIPS FOR A COPPER-ZINC SULPHIDE ORE Udd, J E; Caron, M; Gasps, D CIM Bull, VTO, N78~, Aug 1977, PI02-I08 A core sample for this study was taken from the sull~hide ore of the Geco Mine. The subsequent
783028 ALGEBRAIC EVALUATION OF ~ O - D I ~ N S I O N A L FINITE STRAIN R O ~ S Sanderson, D J J Int Ass Math Geol, Vg, NS, Oct 1977, m83-~% Discus~3es bhe Use of algebraic solutions to replace Mohr construction, the solution of a~gular changes in strain rosettes, amd the treatment of overdstermined strain rosettes. Simple examples of the algebraic solution of strain rosette dE~b~are given ar~l, where possible, previously published problems are used to facilitate comparison with Mohr circle solutions 783029 MEASURING THE COEFFICIENT OF INgERNAL FRICTION FOR SOIL IN SPHERICALLY ~ T R I C PLASTIC FLOW Kolkov, 0 S SOV Min Sci, VI3, NI, Jan-Feb 1977, P21-24 783030 D~GRMATION MECHANISM OF LOOSE MATERIAL Katashinskii, V P; Vinogradov, G A; Rukhailo, N V SOy Min Sci, V12, N6, Nov-Dec 1976, P573-576 Reports an investigation of shear deformation of grar~ar materials using x-ray radiography to visualise slip surface,;. "~+U~erials used were aluminium powder, boron carbide powder and s~nd.