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Influence of geological factors on the mechanical properties of rock in the Palo Duro Basin
131A 864O46 Delayed failure in rock loaded in uniaxial compression Lajtai. E Z: Schmidtke. R H Rock Mech Rock Engng V19. NI. Jan-March 1986. PII-25 The long-term response to sustained compressive loading of two crystalline hard rocks of the Canadian Shield has been investigated. Static fatigue tests conducted on granite and anorthosite have shown that in a humid environment the longterm strengths of these crystalline igneous rocks could be less than 60% of their dry instantaneous strengths. Such reduction in strength has implications for the design and construction of deep tunnels, mines and other underground installations. The particular case of a nuclear fuel waste vault located at a depth of one kilometre is considered.
864O47 Iron oxide properties versus strength of ferruginous crust and iron-glaebules in soils Shadfan, H; Dixon, J B; Calhoun, F G Soil Sei VI40, N5, Not, 1985, P317-325 The content, mineralogy and crystallinity of iron oxides have been correlated with strength for iron rich soils and laterites in different environmental soil conditions. Examination included penetration tests, X-ray diffraction and scanning electron microscopy. Crust formation is found in a suitable crystallisation environment which allows the formation of large crystals which link together to form a rigid network.
864048 Optimization of pillar dimensions in permafrost placer mine Skudrzyk, F J; Mukesh, K Proc 2nd Annual Workshop Generic Mineral Technology Center Mine Systems Design and Ground Control, Reno, ,Nevada, 12-13 Nov 1984 P51-71. Publ Blacksburg." Virginia Polytechnic Inst and State Unw. 1984 The problem of pillar design for underground mining in frozen ground is considered. From a brief review of available literature, an expression is proposed for pillar strength of frozen gravel, which takes into account pillar size, shape, temperature, ice content, heterogeneity, organic matter content and deformation rate. A laboratory test program was set up to quantify the effects of each of these variables. Sample preparation and testing are described in detail. The strength was seen to be highly sensitive to strain rate and sample temperature, but sample shape or ice content had minimal influence.
864049 Utilization of colliery tailings in mining activities Atkins, A S; Hughes, D; Parkin, D; Singh, R N Proc of the Symposium on the Reclamation, Treatment and Utilization of Coal Mining Wastes, Durham, 10-14 Sept 1984 P18.1-18.11. Publ London. NCB. 1984 The techniques of dirt disposal in the UK coal industry and the problems of liquid tailings disposal in lagoons are outlined. Comparative costs of liquid tailings disposal by lagoons system and dewatering by filter press are given. The geotechnical properties, effect on ground control and cost effectiveness of utilising mixtures of colliery tailings and pulverised fuel ash as a replacement material in conventional pump packs are described, as are strain control tests on this material on a stiff testing machine.
864050 Design shear strengths for U.K. coarse colliery discards Taylor. R K: Garrard, G F G Proc of the Symposium on the Reclamation, Treatment and Utilization of Coal Mining Wastes, Durham, 10-14 Sept 1984 P34.1-34.14. Publ London. NCB. 1984 The analysis of UK discards has provided a range of shear strength parameters which may be used as trial values for long-and short-term design purposes. On an effective stress basis, statistical equalities have revealed that discards from different coalfields fall into 3 groups of differing shear strength characteristics. Evidence considered favours the adoption of the drained triaxial test using 100ram diameter specimens, rather than a large-size laboratory shear box. Total stress (undrained) shear strengths are characterised by a significant frictional component. The measured residual strength is very much dependent on the degree of comminution induced on the shear plane. Its value is a function of mincralogical composition, compaction history, applied normal stress level, shear displacement and possibly the type of shear box used.
864051 Shear strength of minestone under low normal stress in large shear box (applied to reinforced minestone) Rainbow, A K M Proc of the Symposium on the Reclamation, Treatment and Utilization of Coal Mining Wastes, Durham, 10-14 Sept 1984 P36.1-36.8. Publ London." NCB, 1984 The Department of Transport Technical Memorandum BE3/78 represents the first phase in drafting a comprehensive specification for the use of reinforced earth in Britain, in which frictional and cohesive frictional soils shall be tested to obtain the effective angle of internal friction a n d or effective cohesion. Three samples are to be subjected to effective normal stresses equivalent to the maximum vertical pressure in the fill at the base, quarter height and mid-height of the structure. It is suggested that the method of interpretation of the results obtained from the tests could result in significant differences in the effective angle of shearing resistance. Examples, both theoretical and actual, are presented. A series of tests on minestone from different sources using the large shear box was performed and the results are presented to illustrate the possible variations. The economic effect of interpretation of test data is included.
864052 Influence of geological factors on the mechanical properties of rock in the Palo Duro Basin Cregger, D M; Corkum, D H; Gokce, A O: Peck. J H In: Research and Engineering Applications in Rock Masses (paper to the 26th US Symposium on Rock Mechanics, Rapid City, 26-28 June 1985) VI, P79-80. Publ Rotterdam. A. A. Balkema, 1985 For accurate thermomechanical modelling and performance assessment of a high level nuclear waste repository in the Palo Duro Basin, Texas, USA, the rock cbaraeterisation approach is to group rock mechanics tests results by lithologic type and by formation, assuming that deposits of similar age will have experienced a similar geologic history. Factors such as lithology, texture, depositional and diagenetic history, in situ stress and structural history are appropriate modelling parameters.
t~ 1986 Pergamon Journals Ltd. Reproduction not permitted
864O47 Iron oxide properties versus strength of ferruginous crust and iron-glaebules in soils Shadfan, H; Dixon, J B; Calhoun, F G Soil Sei VI40, N5, Not, 1985, P317-325 The content, mineralogy and crystallinity of iron oxides have been correlated with strength for iron rich soils and laterites in different environmental soil conditions. Examination included penetration tests, X-ray diffraction and scanning electron microscopy. Crust formation is found in a suitable crystallisation environment which allows the formation of large crystals which link together to form a rigid network.
864048 Optimization of pillar dimensions in permafrost placer mine Skudrzyk, F J; Mukesh, K Proc 2nd Annual Workshop Generic Mineral Technology Center Mine Systems Design and Ground Control, Reno, ,Nevada, 12-13 Nov 1984 P51-71. Publ Blacksburg." Virginia Polytechnic Inst and State Unw. 1984 The problem of pillar design for underground mining in frozen ground is considered. From a brief review of available literature, an expression is proposed for pillar strength of frozen gravel, which takes into account pillar size, shape, temperature, ice content, heterogeneity, organic matter content and deformation rate. A laboratory test program was set up to quantify the effects of each of these variables. Sample preparation and testing are described in detail. The strength was seen to be highly sensitive to strain rate and sample temperature, but sample shape or ice content had minimal influence.
864049 Utilization of colliery tailings in mining activities Atkins, A S; Hughes, D; Parkin, D; Singh, R N Proc of the Symposium on the Reclamation, Treatment and Utilization of Coal Mining Wastes, Durham, 10-14 Sept 1984 P18.1-18.11. Publ London. NCB. 1984 The techniques of dirt disposal in the UK coal industry and the problems of liquid tailings disposal in lagoons are outlined. Comparative costs of liquid tailings disposal by lagoons system and dewatering by filter press are given. The geotechnical properties, effect on ground control and cost effectiveness of utilising mixtures of colliery tailings and pulverised fuel ash as a replacement material in conventional pump packs are described, as are strain control tests on this material on a stiff testing machine.
864050 Design shear strengths for U.K. coarse colliery discards Taylor. R K: Garrard, G F G Proc of the Symposium on the Reclamation, Treatment and Utilization of Coal Mining Wastes, Durham, 10-14 Sept 1984 P34.1-34.14. Publ London. NCB. 1984 The analysis of UK discards has provided a range of shear strength parameters which may be used as trial values for long-and short-term design purposes. On an effective stress basis, statistical equalities have revealed that discards from different coalfields fall into 3 groups of differing shear strength characteristics. Evidence considered favours the adoption of the drained triaxial test using 100ram diameter specimens, rather than a large-size laboratory shear box. Total stress (undrained) shear strengths are characterised by a significant frictional component. The measured residual strength is very much dependent on the degree of comminution induced on the shear plane. Its value is a function of mincralogical composition, compaction history, applied normal stress level, shear displacement and possibly the type of shear box used.
864051 Shear strength of minestone under low normal stress in large shear box (applied to reinforced minestone) Rainbow, A K M Proc of the Symposium on the Reclamation, Treatment and Utilization of Coal Mining Wastes, Durham, 10-14 Sept 1984 P36.1-36.8. Publ London." NCB, 1984 The Department of Transport Technical Memorandum BE3/78 represents the first phase in drafting a comprehensive specification for the use of reinforced earth in Britain, in which frictional and cohesive frictional soils shall be tested to obtain the effective angle of internal friction a n d or effective cohesion. Three samples are to be subjected to effective normal stresses equivalent to the maximum vertical pressure in the fill at the base, quarter height and mid-height of the structure. It is suggested that the method of interpretation of the results obtained from the tests could result in significant differences in the effective angle of shearing resistance. Examples, both theoretical and actual, are presented. A series of tests on minestone from different sources using the large shear box was performed and the results are presented to illustrate the possible variations. The economic effect of interpretation of test data is included.
864052 Influence of geological factors on the mechanical properties of rock in the Palo Duro Basin Cregger, D M; Corkum, D H; Gokce, A O: Peck. J H In: Research and Engineering Applications in Rock Masses (paper to the 26th US Symposium on Rock Mechanics, Rapid City, 26-28 June 1985) VI, P79-80. Publ Rotterdam. A. A. Balkema, 1985 For accurate thermomechanical modelling and performance assessment of a high level nuclear waste repository in the Palo Duro Basin, Texas, USA, the rock cbaraeterisation approach is to group rock mechanics tests results by lithologic type and by formation, assuming that deposits of similar age will have experienced a similar geologic history. Factors such as lithology, texture, depositional and diagenetic history, in situ stress and structural history are appropriate modelling parameters.
t~ 1986 Pergamon Journals Ltd. Reproduction not permitted