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Prediction of aggregate and pavement polishing
114A 854047 Effects of dilatant hardening on the development of concentrated shear deformation in fissured rock masses Rudnicki, J W J Geophys Res 1/89, NBll, Oct 1984, P9259-9270 An analysis of the shear of an inelastically deforming rock mass which contains a weakened layer. The effect of dilatancy on pore fluid pressure and hence effective stress level is taken into account.
854048 Dislocation model of the stress history dependence of frictional slip Olsson, W A J Geophys Res 1/89, NBll, Oct 1984, P9271-9280 A theory is presented incorporating non-uniform friction for frictional slippage of cracked or jointed rocks. It includes continuous distributions of infinitesimal dislocations, and predicts non-linear, stress history dependent strain behaviour. Memory effects seen during cyclic stressing of rocks may be explained. The problems posed by the presence of joints or cracks in experimental test specimens are highlighted.
854052 Anisotropy of elasticity of rocks and its effect on the magnitude and distribution of stresses around underground openings Kwasniewski, M In: Applications of Rock Mechanics to Planning and Design Prior to Mining (paper to the 8th Plenary Scientific Session of the International Bureau of Strata Atechanies, World Mining Congress, Essen, 22-24 June 1983) P5-3 7. Publ Rotterdam: .4. A. Balkema, 1984 The equations of state of a transversely ~sotropic elastic body and the coefficient of anisotropy are defined. The methods of determining elastic constants of rock as a transversely isotropic medium are considered and experimental tests on carboniferous rocks using uniaxial compression are described. The effect of the degree of anisotropy of elasticity of transversely isotropic rock, and inclination of rock strata, on stress fields around underground openings, differently orientated to the directions of dip and strike of rock strata, is analysed. Stress fields around underground openings in rocks of strong, medium and poor anisotropy of elasticity are evaluated.
Surface properties 854049 Preliminary studies of Class I1 brittle rock behaviour Simmons, J V Proc 4th AustraUa-New Zealand Conference on Geomechatdcs, Perth, Western Austra~a, 14-18 May 1984 1/1, P58-61. Publ Barton: lnst of Engineers, 1984 A lateral servo-controlled uniaxial compression test technique for rock core is described. Complete load-deformation data from tests on Mount Isa rocks are discussed. Concepts of Class II brittle rock yield are discussed and some preliminary test data evaluated.
854050 Elastic-plastic work-hardening model for soft clays Singh, R D; Khosla, V K Proc 4th Australia-New Zealand Conference on Geomechanics, Perth, Western Australia, 14-18 May 1984 VI, P62-66. Publ Barton: lnst of Engineers, 1984 Constitutive equations for a simple cap model using classical plasticity theory are presented. Comparisons of stress-strain curves predicted by the finite element analysis with the experimental data are shown. Adequacy of the model is examined in application to tests on Grundite clay.
854051 Laboratory determination of Ko and comparison with prototype silo observations Blight, G E; Ofer, Z Proc 4th Australia-New Zealand Conference on Geomectumics, Perth, Western Austra~a, 14-18 May 1984 I/1, P83-87. Publ Barton: lnst of Engineers, 1984 Methods of measuring of the coefficient of lateral pressure at rest in the laboratory are reviewed. Measurements by two basic methods are compared and constrasted with values of Ko measured in storage silos.
854053 Resistance to polishing of roadmaking aggregates from Bulgaria Daskalova, L lnt Assoc Engng Geol Bull N29, June 1984, P349-354 (paper to the International Symposium on Aggregates, Nice, 21-23 May 1984) Polishing and other mechanical properties were measured according to BS 812-75 and Bulgarian standards. Polished stone value (PSV) can be correlated with other properties, Polishing was also evaluated under road conditions and the polishing process examined by scanning electron microscopy. Recommendations are made for suitable materials for road use in terms of PSV and skid resistance.
854054 Prediction of aggregate and pavement polishing Henry, J J; Meyer, W E lnt Assoc Engng Geol Bull N29, June 1984. P365-369 [paper to the International Symposium on Aggregates, Nice, 21-23 May 1984) Pavement microtexture is controlled by aggregate petrography and polishing effects of traffic, macrostructure by aggregate size, compaction during construction and by traffic, mix design and wear. Wet friction is greatest where most water has been expelled and depends on aggregate microtexture. Microtexture can be reduced by polishing or increased by the effects of dust or other contaminants. A series of laboratory tests has been developed to simulate road aggregate wear. Results are presented and the significance of the laboratory testing procedures are discussed.
854055 Adaptation of the wearing test of crushed stones by the Dotty test to the wearing machine by Bohme Nemeskeri, N lnt Assoc Engng Geol Bull N29, June 1984, P411-414 (paper to the International Symposium on Aggregates, Nice, 21-23 May 1984) The Dorry test (BS 812) uses crushed stone set in a resin matrix whilst the Bohme test uses samples cut from a single stone block, the test area being 50 sq cm in each case. Both methods work on the same principle and use similar testing devices. Test pieces were prepared and evaluated using an adapted Bohme machine
854048 Dislocation model of the stress history dependence of frictional slip Olsson, W A J Geophys Res 1/89, NBll, Oct 1984, P9271-9280 A theory is presented incorporating non-uniform friction for frictional slippage of cracked or jointed rocks. It includes continuous distributions of infinitesimal dislocations, and predicts non-linear, stress history dependent strain behaviour. Memory effects seen during cyclic stressing of rocks may be explained. The problems posed by the presence of joints or cracks in experimental test specimens are highlighted.
854052 Anisotropy of elasticity of rocks and its effect on the magnitude and distribution of stresses around underground openings Kwasniewski, M In: Applications of Rock Mechanics to Planning and Design Prior to Mining (paper to the 8th Plenary Scientific Session of the International Bureau of Strata Atechanies, World Mining Congress, Essen, 22-24 June 1983) P5-3 7. Publ Rotterdam: .4. A. Balkema, 1984 The equations of state of a transversely ~sotropic elastic body and the coefficient of anisotropy are defined. The methods of determining elastic constants of rock as a transversely isotropic medium are considered and experimental tests on carboniferous rocks using uniaxial compression are described. The effect of the degree of anisotropy of elasticity of transversely isotropic rock, and inclination of rock strata, on stress fields around underground openings, differently orientated to the directions of dip and strike of rock strata, is analysed. Stress fields around underground openings in rocks of strong, medium and poor anisotropy of elasticity are evaluated.
Surface properties 854049 Preliminary studies of Class I1 brittle rock behaviour Simmons, J V Proc 4th AustraUa-New Zealand Conference on Geomechatdcs, Perth, Western Austra~a, 14-18 May 1984 1/1, P58-61. Publ Barton: lnst of Engineers, 1984 A lateral servo-controlled uniaxial compression test technique for rock core is described. Complete load-deformation data from tests on Mount Isa rocks are discussed. Concepts of Class II brittle rock yield are discussed and some preliminary test data evaluated.
854050 Elastic-plastic work-hardening model for soft clays Singh, R D; Khosla, V K Proc 4th Australia-New Zealand Conference on Geomechanics, Perth, Western Australia, 14-18 May 1984 VI, P62-66. Publ Barton: lnst of Engineers, 1984 Constitutive equations for a simple cap model using classical plasticity theory are presented. Comparisons of stress-strain curves predicted by the finite element analysis with the experimental data are shown. Adequacy of the model is examined in application to tests on Grundite clay.
854051 Laboratory determination of Ko and comparison with prototype silo observations Blight, G E; Ofer, Z Proc 4th Australia-New Zealand Conference on Geomectumics, Perth, Western Austra~a, 14-18 May 1984 I/1, P83-87. Publ Barton: lnst of Engineers, 1984 Methods of measuring of the coefficient of lateral pressure at rest in the laboratory are reviewed. Measurements by two basic methods are compared and constrasted with values of Ko measured in storage silos.
854053 Resistance to polishing of roadmaking aggregates from Bulgaria Daskalova, L lnt Assoc Engng Geol Bull N29, June 1984, P349-354 (paper to the International Symposium on Aggregates, Nice, 21-23 May 1984) Polishing and other mechanical properties were measured according to BS 812-75 and Bulgarian standards. Polished stone value (PSV) can be correlated with other properties, Polishing was also evaluated under road conditions and the polishing process examined by scanning electron microscopy. Recommendations are made for suitable materials for road use in terms of PSV and skid resistance.
854054 Prediction of aggregate and pavement polishing Henry, J J; Meyer, W E lnt Assoc Engng Geol Bull N29, June 1984. P365-369 [paper to the International Symposium on Aggregates, Nice, 21-23 May 1984) Pavement microtexture is controlled by aggregate petrography and polishing effects of traffic, macrostructure by aggregate size, compaction during construction and by traffic, mix design and wear. Wet friction is greatest where most water has been expelled and depends on aggregate microtexture. Microtexture can be reduced by polishing or increased by the effects of dust or other contaminants. A series of laboratory tests has been developed to simulate road aggregate wear. Results are presented and the significance of the laboratory testing procedures are discussed.
854055 Adaptation of the wearing test of crushed stones by the Dotty test to the wearing machine by Bohme Nemeskeri, N lnt Assoc Engng Geol Bull N29, June 1984, P411-414 (paper to the International Symposium on Aggregates, Nice, 21-23 May 1984) The Dorry test (BS 812) uses crushed stone set in a resin matrix whilst the Bohme test uses samples cut from a single stone block, the test area being 50 sq cm in each case. Both methods work on the same principle and use similar testing devices. Test pieces were prepared and evaluated using an adapted Bohme machine