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Direct shear testing of a completely decomposed granite
233A horizontal planes are planes of maximum stress obliquity. For simple shear devices which do not provide for measurement of lateral stresses, an empirical equation is proposed through which the shear stress ratio on the vertical planes can be computed. Auth.
895035 In-situ direct shear tests for lateHtic gravels in Taiwan Chu, B L; Hsu, T W; Lai, T C
895031 Fluid pressures in deforming porous rocks Palciauskas, V V; Domenico, P A Water Resour Res V25. N2. Feb 1989, P203-213
Two sites in Taiwan were studied as part of the search for building aggregates. Samples were taken for grain size analysis and determination of index properties (bulk unit weight, specific gravity and Atterberg limits) and engineering properties (absorption, abrasion, soundness and compressive strength). Grain size analysis showed grains to be predominantly over lcm, so in situ direct shear tests were undertaken. Testing equipment and procedure are described, and results discussed. The 2 sites have good quantities of aggregates suitable for engineering use.
Constitutive relations describing fluid pressure response of a porous medium to changes in stress and temperature must reflect processes operative over the time scale allowed for deformation. Short term deformations are described by undrained moduli and intermediate term deformations by drained moduli, both using linear elastic theory. Deformations over geological time scales, such as compaction, are dominated by irreversible processes. Constitutive equations are developed for both elastic and irreversible cases, and magnitude and interpretation of relevant material properties examined. A sample calculation for sandstone is presented. 895032 Empirical relationships between porosity and the mechanical properties of tuff Nimick, F B Key Questions in Rock Mechanics: Proc 29th US Symposium, Minneapolis, 13-15 June 1988 P741-742. Publ Rotterdam: A A Balkema. 1988 Earlier studies on rock from the Yucca Mountain, Nevada, site suggest that empirical relations exist between porosity of tuff and cohesion, angle of friction, and stress at onset of dilatancy. These results are explained qualitatively using the Sammis and Ashby (1986) model. 895033 Scale effect with regard to the deformability of calcarenite Nienhuis, H; Price, D G Proc 24th Annual Conference of the Engineering Group of the Geological Society, Field Testing in Engineering Geology, Sunderland, 4-8 Sept 1988 P331-343. Publ Sunderland: Sunderland Polytechnic, 1988 Cyclic plate loading tests using 7 different plate diameters were undertaken on an apparently homogeneous calcarenite rock mass. The tests were conducted horizontally and parallel to the bedding. In a first series of tests it appeared that deformation modulus was related to plate dimensions, but a second series suggested that this variation was caused by hidden inhomogeneities in the rock mass. 895O34 Direct shear testing of a completely decomposed granite Cheung, C K: Greenway, D R; Massey, J B Proc 2nd International Conference on Geomechanics in Tropical Soils, Singapore, 12-14 December 1988 VI, P109118. Publ Rotterdam: A A Balkema, 1988 The direct shear test is a quick and easy method to determine shear strength of residual soils for use in slope design. A series of tests was undertaken on an undisturbed saprolitic soil to examine soil behaviour and the influence of specimen size and rate of shearing on the measured strength of the soil. The test is shown to be satisfactory for routine measurement of soil shear strength. The effects of soil anisotropy are briefly examined.
Proc 2nd InternationalConference on Geomeelmalcs in Tropical Soils,Singapore, 12-14 December 1988 VI, PI19125. Pubi Rotterdam: A A Balkema, 1988
895036 Geotechnical properties of a compacted lateritic gravel from Cachoeira Porteira Dam Costa Filho, L M; de Campos, T M P; Ritter, E; Ribeiro, A C O Proe 2nd International Conference on Geomechanics in Tropical Soils, Singapore, 12-14 December 1988 VI, PI27134. Publ Rotterdam: A A Balkema. 1988 Lateritic gravel was tested to analyse its use as a fill for the dam and dykes of the power plant. Grain size analysis, plasticity and compaction were determined, and triaxial and permeability tests undertaken. As lateritic content was variable over the borrow areas, the effect of lateritic content on geomechanical properties was studied. 20, 40, 60 and 80% by weight of lateritic concretions were subjected to triaxial and uniaxial tests. Results show that even a 20% laterite content significantly increases strength and stiffness. 895037 Influence of the moisture content in the shear strength of undisturbed lateritic soil Davison Dias, R Proe 2nd International Conference on Geomechanics in Tropical Soils, Singapore, 12-14 December 1988 VI. P!35142. Publ Rotterdam: A A Balkema, 1988 Triaxial compression tests with pore water pressure measurements were undertaken on a laterite soil at various degrees of saturation, ranging from natural moisture content to complete saturation. Results are analysed and show stress paths depend on water content and stress level, and the effective stress envelope is almost unique, independent of water content. 895038 Preliminary consolidation and triaxial strength test results for some undisturbed tropical red clays from West Java, Indonesia Hobbs, P R N; Culshaw, M G; Northmore, K J: Rachlan, A; Entwisle, D C Proe 2nd International Conference on Geomechanics in
Tropical Soils,Singapore, 12-14 December 1988 VI, P149155. Publ Rotterdam: A A Baikema, 1988 Undisturbed samples of residual clay soils of Indonesia were tested to determine in situ stress-strain and settlement characteristics. I-D oedometer consolidation and stress path triaxial tests were used. Preliminary results have identified 2 yield points which can be interpreted as failure or destructuring of inter-ped and intra-ped bonding. Index tests show the soils to be plastic clays, but the pseudo-overconsolidated nature of the materials and measured permeability values suggest their in situ engineering behaviour is more akin to weakly cemented silts.
~ 1989 Pergamon Press plc. Reproduction not permitted
895035 In-situ direct shear tests for lateHtic gravels in Taiwan Chu, B L; Hsu, T W; Lai, T C
895031 Fluid pressures in deforming porous rocks Palciauskas, V V; Domenico, P A Water Resour Res V25. N2. Feb 1989, P203-213
Two sites in Taiwan were studied as part of the search for building aggregates. Samples were taken for grain size analysis and determination of index properties (bulk unit weight, specific gravity and Atterberg limits) and engineering properties (absorption, abrasion, soundness and compressive strength). Grain size analysis showed grains to be predominantly over lcm, so in situ direct shear tests were undertaken. Testing equipment and procedure are described, and results discussed. The 2 sites have good quantities of aggregates suitable for engineering use.
Constitutive relations describing fluid pressure response of a porous medium to changes in stress and temperature must reflect processes operative over the time scale allowed for deformation. Short term deformations are described by undrained moduli and intermediate term deformations by drained moduli, both using linear elastic theory. Deformations over geological time scales, such as compaction, are dominated by irreversible processes. Constitutive equations are developed for both elastic and irreversible cases, and magnitude and interpretation of relevant material properties examined. A sample calculation for sandstone is presented. 895032 Empirical relationships between porosity and the mechanical properties of tuff Nimick, F B Key Questions in Rock Mechanics: Proc 29th US Symposium, Minneapolis, 13-15 June 1988 P741-742. Publ Rotterdam: A A Balkema. 1988 Earlier studies on rock from the Yucca Mountain, Nevada, site suggest that empirical relations exist between porosity of tuff and cohesion, angle of friction, and stress at onset of dilatancy. These results are explained qualitatively using the Sammis and Ashby (1986) model. 895033 Scale effect with regard to the deformability of calcarenite Nienhuis, H; Price, D G Proc 24th Annual Conference of the Engineering Group of the Geological Society, Field Testing in Engineering Geology, Sunderland, 4-8 Sept 1988 P331-343. Publ Sunderland: Sunderland Polytechnic, 1988 Cyclic plate loading tests using 7 different plate diameters were undertaken on an apparently homogeneous calcarenite rock mass. The tests were conducted horizontally and parallel to the bedding. In a first series of tests it appeared that deformation modulus was related to plate dimensions, but a second series suggested that this variation was caused by hidden inhomogeneities in the rock mass. 895O34 Direct shear testing of a completely decomposed granite Cheung, C K: Greenway, D R; Massey, J B Proc 2nd International Conference on Geomechanics in Tropical Soils, Singapore, 12-14 December 1988 VI, P109118. Publ Rotterdam: A A Balkema, 1988 The direct shear test is a quick and easy method to determine shear strength of residual soils for use in slope design. A series of tests was undertaken on an undisturbed saprolitic soil to examine soil behaviour and the influence of specimen size and rate of shearing on the measured strength of the soil. The test is shown to be satisfactory for routine measurement of soil shear strength. The effects of soil anisotropy are briefly examined.
Proc 2nd InternationalConference on Geomeelmalcs in Tropical Soils,Singapore, 12-14 December 1988 VI, PI19125. Pubi Rotterdam: A A Balkema, 1988
895036 Geotechnical properties of a compacted lateritic gravel from Cachoeira Porteira Dam Costa Filho, L M; de Campos, T M P; Ritter, E; Ribeiro, A C O Proe 2nd International Conference on Geomechanics in Tropical Soils, Singapore, 12-14 December 1988 VI, PI27134. Publ Rotterdam: A A Balkema. 1988 Lateritic gravel was tested to analyse its use as a fill for the dam and dykes of the power plant. Grain size analysis, plasticity and compaction were determined, and triaxial and permeability tests undertaken. As lateritic content was variable over the borrow areas, the effect of lateritic content on geomechanical properties was studied. 20, 40, 60 and 80% by weight of lateritic concretions were subjected to triaxial and uniaxial tests. Results show that even a 20% laterite content significantly increases strength and stiffness. 895037 Influence of the moisture content in the shear strength of undisturbed lateritic soil Davison Dias, R Proe 2nd International Conference on Geomechanics in Tropical Soils, Singapore, 12-14 December 1988 VI. P!35142. Publ Rotterdam: A A Balkema, 1988 Triaxial compression tests with pore water pressure measurements were undertaken on a laterite soil at various degrees of saturation, ranging from natural moisture content to complete saturation. Results are analysed and show stress paths depend on water content and stress level, and the effective stress envelope is almost unique, independent of water content. 895038 Preliminary consolidation and triaxial strength test results for some undisturbed tropical red clays from West Java, Indonesia Hobbs, P R N; Culshaw, M G; Northmore, K J: Rachlan, A; Entwisle, D C Proe 2nd International Conference on Geomechanics in
Tropical Soils,Singapore, 12-14 December 1988 VI, P149155. Publ Rotterdam: A A Baikema, 1988 Undisturbed samples of residual clay soils of Indonesia were tested to determine in situ stress-strain and settlement characteristics. I-D oedometer consolidation and stress path triaxial tests were used. Preliminary results have identified 2 yield points which can be interpreted as failure or destructuring of inter-ped and intra-ped bonding. Index tests show the soils to be plastic clays, but the pseudo-overconsolidated nature of the materials and measured permeability values suggest their in situ engineering behaviour is more akin to weakly cemented silts.
~ 1989 Pergamon Press plc. Reproduction not permitted