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Physico-chemical and mechanical properties of peats and peaty ground
212A 914101 Study of the effect of some factors on shear strength of expansive soils in Egypt Reyad, M M
Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V1. P447-450. Publ Rotterdam." A A Balkema, 1990 The effect of initial moisture content and initial density on the shear strength of expansive soils from the Cairo and Aswan areas was examined using consolidated drained triaxial tests. As initial moisture content increased, shear strength increased until a peak value was reached at moisture content slightly higher than the shrinkage limit, after which strength fell rapidly. Shear strength also increased with increasing initial density.
914102 Shear behaviour and strength prediction studies on an Indian quartzite and sandstone Srivastava, R K; Jalota, A V; Amir, A A A Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 VI, P467-472. Publ Rotterdam: A A Balkema. 1990 Triaxial tests at confining pressure to 10MPa were carried out on quartzite and sandstone rocks. The ability of strength criteria of Hock and Brown, Bieniawski, and Rao et al to describe observed behaviour has been examined. For the case in question, the Rao et al criterion was superior.
914103 Geotechnical characteristics of residual soils (In French) Torres, L E Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 VI. P487-494. Publ Rotterdam." A A Balkema, 1990 A geophysical-geotechnical profile of the residual soils of the Rio Luiz zone of southern Ecuador is presented. Six layers are differentiated, from intact rock to fully weathered mature residual soil. Mechanical and physical parameters of the soil were measured in the laboratory. Plasticity decreased with depth, whilst grain size increased. Cohesion and friction angle were generally low. Compressibility decreased with increased alteration. There are no distinct interfaces between the layers.
914104 Use of Schmidt hammer for estimating properties of weak rock Xu, S; Grasso, P; Mahtab, A Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 VI, P511-519. Publ Rotterdam: A A Balkema, 1990 Weak rocks, often containing healed fractures or deformation fabrics (schistosity, foliation), react differently to strong rocks on Schmidt hammer impact. Relative direction of impact and closeness to a fracture can significantly influence Schmidt hammer index, R. Strength and deformation parameters of weak rocks are often overestimated using available empirical relations for Schmidt hammer tests. Laboratory Schmidt hammer tests have been carried out on cylindrical specimens of soft rocks containing weakness planes. Predictive formulae have been developed which take into account influence of fabric and show good correlation of R with uniaxial strength and tangent Young's modulus.
914105 Physico--chemical and mechanical properties of peats and peaty ground Yamaguchi, H Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 VI, P521-526. Publ Rotterdam: A A Balkema. 1990 Undisturbed samples of peaty ground were taken to depth 12m at a site near Sapporo, Japan. Organic matter content was investigated and oedometer, permeability, and shear tests carried out. Changes in pore volume and pore size distribution during consolidation were examined by mercury porosimetry. Relations of ignition loss with specific gravity, void ratio, natural water content, organic matter content, and humus content are illustrated, together with the results of the consolidation experiments.
914106 Triaxial testing of rock/soil under cryogenic conditions Zorn, N F; Schaminee, P E L Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V1, P535-540. Publ Rotterdam: A A Balkema, 1990 An apparatus has been developed to test geomaterials under conditions simulating those around an unlined cryogenic storage cavern. Cylindrical specimens were prepared with a central hole to allow cooling by liquid nitrogen, and temperature sensors to monitor temperature distribution. Triaxial tests wee carried out on samples of rock and on overconsolidated clay. Stress-strain-time behaviour is described, including volume strains resulting from cooling of the samples.
914107 Engineering performance evaluation of the foundation rocks of Narmada Sagar Dam Project, Central India Choubey, V D; Chaudhari, S Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 VI, P575-580. Publ Rotterdam: A A Balkema, 1990 The large gravity dam will be founded on quartzite rock with thin siltstone intercalations. Physicomechanical properties were studied in the laboratory. Nx cores were taken and uniaxial compression strength, elastic properties, and index properties measured. The rocks were seen to be brittle and hard, with high strength and low modulus ratio.
914108 Mechanical properties of the Chalk Clayton, C R I Proc International Chalk Symposium, Brighton, 4-7 September 1989 P213-232. Publ London: Thomas Telford, 1990 C h a l k as an engineering material has varying properties. The variabilities can be attributed to depositional processes, and chemical and mechanical activities. The effects of these variabilities, which are dominated by the frequency, morphology and aperture of discontinuities and the hardness and strength of chalk, on the engineering behaviour of chalk during construction are discussed. Methods used to obtain design information for chalk materials are presented.
© 1991 Pergamon Press plc. Reproduction not permitted
Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V1. P447-450. Publ Rotterdam." A A Balkema, 1990 The effect of initial moisture content and initial density on the shear strength of expansive soils from the Cairo and Aswan areas was examined using consolidated drained triaxial tests. As initial moisture content increased, shear strength increased until a peak value was reached at moisture content slightly higher than the shrinkage limit, after which strength fell rapidly. Shear strength also increased with increasing initial density.
914102 Shear behaviour and strength prediction studies on an Indian quartzite and sandstone Srivastava, R K; Jalota, A V; Amir, A A A Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 VI, P467-472. Publ Rotterdam: A A Balkema. 1990 Triaxial tests at confining pressure to 10MPa were carried out on quartzite and sandstone rocks. The ability of strength criteria of Hock and Brown, Bieniawski, and Rao et al to describe observed behaviour has been examined. For the case in question, the Rao et al criterion was superior.
914103 Geotechnical characteristics of residual soils (In French) Torres, L E Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 VI. P487-494. Publ Rotterdam." A A Balkema, 1990 A geophysical-geotechnical profile of the residual soils of the Rio Luiz zone of southern Ecuador is presented. Six layers are differentiated, from intact rock to fully weathered mature residual soil. Mechanical and physical parameters of the soil were measured in the laboratory. Plasticity decreased with depth, whilst grain size increased. Cohesion and friction angle were generally low. Compressibility decreased with increased alteration. There are no distinct interfaces between the layers.
914104 Use of Schmidt hammer for estimating properties of weak rock Xu, S; Grasso, P; Mahtab, A Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 VI, P511-519. Publ Rotterdam: A A Balkema, 1990 Weak rocks, often containing healed fractures or deformation fabrics (schistosity, foliation), react differently to strong rocks on Schmidt hammer impact. Relative direction of impact and closeness to a fracture can significantly influence Schmidt hammer index, R. Strength and deformation parameters of weak rocks are often overestimated using available empirical relations for Schmidt hammer tests. Laboratory Schmidt hammer tests have been carried out on cylindrical specimens of soft rocks containing weakness planes. Predictive formulae have been developed which take into account influence of fabric and show good correlation of R with uniaxial strength and tangent Young's modulus.
914105 Physico--chemical and mechanical properties of peats and peaty ground Yamaguchi, H Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 VI, P521-526. Publ Rotterdam: A A Balkema. 1990 Undisturbed samples of peaty ground were taken to depth 12m at a site near Sapporo, Japan. Organic matter content was investigated and oedometer, permeability, and shear tests carried out. Changes in pore volume and pore size distribution during consolidation were examined by mercury porosimetry. Relations of ignition loss with specific gravity, void ratio, natural water content, organic matter content, and humus content are illustrated, together with the results of the consolidation experiments.
914106 Triaxial testing of rock/soil under cryogenic conditions Zorn, N F; Schaminee, P E L Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V1, P535-540. Publ Rotterdam: A A Balkema, 1990 An apparatus has been developed to test geomaterials under conditions simulating those around an unlined cryogenic storage cavern. Cylindrical specimens were prepared with a central hole to allow cooling by liquid nitrogen, and temperature sensors to monitor temperature distribution. Triaxial tests wee carried out on samples of rock and on overconsolidated clay. Stress-strain-time behaviour is described, including volume strains resulting from cooling of the samples.
914107 Engineering performance evaluation of the foundation rocks of Narmada Sagar Dam Project, Central India Choubey, V D; Chaudhari, S Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 VI, P575-580. Publ Rotterdam: A A Balkema, 1990 The large gravity dam will be founded on quartzite rock with thin siltstone intercalations. Physicomechanical properties were studied in the laboratory. Nx cores were taken and uniaxial compression strength, elastic properties, and index properties measured. The rocks were seen to be brittle and hard, with high strength and low modulus ratio.
914108 Mechanical properties of the Chalk Clayton, C R I Proc International Chalk Symposium, Brighton, 4-7 September 1989 P213-232. Publ London: Thomas Telford, 1990 C h a l k as an engineering material has varying properties. The variabilities can be attributed to depositional processes, and chemical and mechanical activities. The effects of these variabilities, which are dominated by the frequency, morphology and aperture of discontinuities and the hardness and strength of chalk, on the engineering behaviour of chalk during construction are discussed. Methods used to obtain design information for chalk materials are presented.
© 1991 Pergamon Press plc. Reproduction not permitted