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Thermal properties as controls on rock surface temperature maxima, and possible implications for rock weathering
143A 855035 Application of the Dugdale crack model to the stress-strain relations and bulk moduli of granite Oda, H; Suzuki, !; Seya, K Tectonophysics VI IO, N3/4. Dec 1984, P297-315 The variations in dynamic and static bulk moduli and compressional strain of granite with hydrostatic pressure were examined by laboratory testing. They were explained by the closure of cracks in the sample as pressure increases. Two crack models, the elliptical crack and the Dugdale crack, were used to interpret the phenomena. As total crack number cannot change, reduction in crack width or length must explain the changes. The Dugdale model is shown to better account for the observed results.
855036 Displacements and strains around probes in sand Davidson, J L; Boghrat, A Proe Conference on Geotechnical Practice in Offshore Engineering, Austin, Texas, 27-29 April 1983 P181-202. Publ New York. ASCE, 1983 The performances of cone and blade type penetrometers were compared by laboratory testing. Displacements and strains in sand around dummy probes were observed using a pseudo stereo technique. Examination of strain contours around the probe, especially in the area where the measuring devices are located, suggests that blade shaped instruments appear to test a much less disturbed soil than cone shaped instruments.
855037 LPC pressiopenetrometer Baguelin, F: Jezequel, J F Proc Conference on Geotechnical Practice in Offshore Engineering, Austin, Texas, 27-29 April 1983 P203-219. Publ New York: ASCE, 1983 The LPC pressiopenetrometer, developed for in situ measurement of soil mechanical properties for offshore engineering is described and its results compared with conventional techniques. 855038 Cone penetration testing in the Beaufort Sea Jefferies, M G: Funegard, E Proc Conference on Geotechnical Practice in Offshore Engineering, Austin, Texas, 27-29 April 1983 P220-243. Publ New York: ASCE, 1983 An electrical cone penetrometer has been developed and widely used in investigating wellsites to define the presence or absence of weak layers. It can measure end bearing together with either friction or pore water pressure. Experience has been gained which enables cone data to be correlated with more fundamental engineering parameters. 855039 Stress-deformation properties of loess and loess-derived alluvium in Western Iowa Bradford, J M: Norton, L D In: Geological Environment and Soil Properties (paper prepared in conjunction with the ASCE Geotechnicai Engineering Division and the ASCE Convention, Houston, Texas, 17-21 Oct 1983) P99-120. Publ New York. ASCE, 1983 Important aspects of laboratory strength tests (direct shear, consolidation and triaxial tests) are summarised and the differences in geotechnical properties of loess and loess-derived alluxium are compared in terms of their fabric analyses.
S u r f a c e properties 855040 Measuring the friction angles of rock joints (In Norwegian) Vik, G Norw Geotech lnst Publ N153. 1984.4P The stability analysis of potentially unstable rock blocks in abutments of the Forrevas dam, Norway, gave the necessary friction angles of rock joints for a safety factor of one. Samples of the joints were taken as 102mm diameter cores and tests carried out according to the methods of Barton and Choubey and Bandis. A friction angle of 47 deg at a calculated normal stress of 1.5MPa was found for the foliation plane, 46.5 deg at 0.2MPa for vertical joints.
T i m e d e p e n d e n t behaviour 855041 Experimental deformation of a synthetic dunite at high temperature and pressure. I. Mechanical behavior, optical microstructure and deformation mechanism Zeuch, D H: Green, H W Tectonophysics Vl lO, N3/4. Dec 1984, P233-262 High temperature creep tests have been carried out on synthetic dunite. Test results are consistent with other work on very dry material and the synthetic material displays behaviour consistent with that of natural materials. The optical textures correspond with natural porphyroclastic textures. The suggested deformation mechanism is dislocation creep with recovery by dynamic recrystallisation. 855042 Experimental deformation of a synthetic dunite at high temperature and pressure. II. Transmission electron microscopy Zeuch, D H; Green, H W Tectonophysics VI IO, N3/4, Dec 1984, P263-296 The development of dislocation substructures during the high temperature creep of synthetic dunite has been followed using transmission electron microscopy. The substructures developed are similar to those in naturally deformed periodotites and it is concluded that the deformation mechanism is the same in both cases. Differences between observed substructures and those in experimentally deformed single crystals are presumed to be due to the fundamental differences in behaviour of single- and polycrystalline materials.
P h y s i c o - c h e m i c a l properties 855043 Thermal properties as controls on rock surface temperature maxima, and possible implications for rock weathering McGreevy, J P Earth Surf Land Process VIO, N2, March-April 1985, P125136 Basalt, sandstone, granite and chalk were exposed to environmental and laboratory temperature cycling with surface and subsurface temperatures being monitored. The differences in temperatures are examined with reference to surface properties, specific heat capacity and thermal conductivity. The effects of rock thermal properties on weathering behaviour are discussed. 855044 Thermal conductivity, thermal diffusivity and thermal capacity of some Nigerian soils Ghuman, B S; Lal, R Soil Sci V139, N1, Jan 1985, P74-80
855036 Displacements and strains around probes in sand Davidson, J L; Boghrat, A Proe Conference on Geotechnical Practice in Offshore Engineering, Austin, Texas, 27-29 April 1983 P181-202. Publ New York. ASCE, 1983 The performances of cone and blade type penetrometers were compared by laboratory testing. Displacements and strains in sand around dummy probes were observed using a pseudo stereo technique. Examination of strain contours around the probe, especially in the area where the measuring devices are located, suggests that blade shaped instruments appear to test a much less disturbed soil than cone shaped instruments.
855037 LPC pressiopenetrometer Baguelin, F: Jezequel, J F Proc Conference on Geotechnical Practice in Offshore Engineering, Austin, Texas, 27-29 April 1983 P203-219. Publ New York: ASCE, 1983 The LPC pressiopenetrometer, developed for in situ measurement of soil mechanical properties for offshore engineering is described and its results compared with conventional techniques. 855038 Cone penetration testing in the Beaufort Sea Jefferies, M G: Funegard, E Proc Conference on Geotechnical Practice in Offshore Engineering, Austin, Texas, 27-29 April 1983 P220-243. Publ New York: ASCE, 1983 An electrical cone penetrometer has been developed and widely used in investigating wellsites to define the presence or absence of weak layers. It can measure end bearing together with either friction or pore water pressure. Experience has been gained which enables cone data to be correlated with more fundamental engineering parameters. 855039 Stress-deformation properties of loess and loess-derived alluvium in Western Iowa Bradford, J M: Norton, L D In: Geological Environment and Soil Properties (paper prepared in conjunction with the ASCE Geotechnicai Engineering Division and the ASCE Convention, Houston, Texas, 17-21 Oct 1983) P99-120. Publ New York. ASCE, 1983 Important aspects of laboratory strength tests (direct shear, consolidation and triaxial tests) are summarised and the differences in geotechnical properties of loess and loess-derived alluxium are compared in terms of their fabric analyses.
S u r f a c e properties 855040 Measuring the friction angles of rock joints (In Norwegian) Vik, G Norw Geotech lnst Publ N153. 1984.4P The stability analysis of potentially unstable rock blocks in abutments of the Forrevas dam, Norway, gave the necessary friction angles of rock joints for a safety factor of one. Samples of the joints were taken as 102mm diameter cores and tests carried out according to the methods of Barton and Choubey and Bandis. A friction angle of 47 deg at a calculated normal stress of 1.5MPa was found for the foliation plane, 46.5 deg at 0.2MPa for vertical joints.
T i m e d e p e n d e n t behaviour 855041 Experimental deformation of a synthetic dunite at high temperature and pressure. I. Mechanical behavior, optical microstructure and deformation mechanism Zeuch, D H: Green, H W Tectonophysics Vl lO, N3/4. Dec 1984, P233-262 High temperature creep tests have been carried out on synthetic dunite. Test results are consistent with other work on very dry material and the synthetic material displays behaviour consistent with that of natural materials. The optical textures correspond with natural porphyroclastic textures. The suggested deformation mechanism is dislocation creep with recovery by dynamic recrystallisation. 855042 Experimental deformation of a synthetic dunite at high temperature and pressure. II. Transmission electron microscopy Zeuch, D H; Green, H W Tectonophysics VI IO, N3/4, Dec 1984, P263-296 The development of dislocation substructures during the high temperature creep of synthetic dunite has been followed using transmission electron microscopy. The substructures developed are similar to those in naturally deformed periodotites and it is concluded that the deformation mechanism is the same in both cases. Differences between observed substructures and those in experimentally deformed single crystals are presumed to be due to the fundamental differences in behaviour of single- and polycrystalline materials.
P h y s i c o - c h e m i c a l properties 855043 Thermal properties as controls on rock surface temperature maxima, and possible implications for rock weathering McGreevy, J P Earth Surf Land Process VIO, N2, March-April 1985, P125136 Basalt, sandstone, granite and chalk were exposed to environmental and laboratory temperature cycling with surface and subsurface temperatures being monitored. The differences in temperatures are examined with reference to surface properties, specific heat capacity and thermal conductivity. The effects of rock thermal properties on weathering behaviour are discussed. 855044 Thermal conductivity, thermal diffusivity and thermal capacity of some Nigerian soils Ghuman, B S; Lal, R Soil Sci V139, N1, Jan 1985, P74-80