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Numerical assessment of the influence of anisotropy on steeply dipping VCR stopes
45A The effects of heat emission from high-level waste on three host formations, granite, clay and salt, was studied. The thermomechanical effects on the stability of repository galleries and on the continuity of the overburden reck are described. From these results, the power densities compatible with the correct operation of the disposal system are determined.
8.q038 Numerical assessment of file influence of anisotropy on steeply dipping VCR stopes Pariseau, W G; Duan, F; Schmuck, C H In: Geomechanics Applications in Underground Hardrock Mining, edited by Pariseau, W G P39-63. Publ New York: AIMM, 1984
Compressibility, swelling and consolidation
Examines the influence of anisotropy on the stability of steeply dipping vertical crater retreat stopes at the Homestake Mine, USA. A sequence of analyses began with elementary test problems for computer program checks and proceeded to the analysis of a study stope area, based on physical data, measured in situ stresses and rock properties. It is concluded that anisotropy is important to stability analysis at the Homestake Mine.
852034 Suction-moisture content-strength and time relationships of a iateritic soil Mohajerani, A Aust Geomech News N7, June 1984, P31-33 Experiments were carried out to examine the relationship between the soil suction, water content, time and unconfined compressive strength for compacted 'red earth' of South-Western Australia.
852035 Shale compaction and statistical physics Korvin, G Geophys J R Astr Soc V78, N1, July 1984, P35-50 The historical development of the ideas on compaction of clays and shales is outlined. It is shown that the exponential porosity depth dependence of compacted shales expressed by Athy's law can be derived using standard methods of statistical physics. The main result states that the exponential compaction law expresses the maximum - entropy equilibrium state of the pores in the rock, that is, compaction is an irreversible process where clay particles tend towards a statistically defined final equilibrium. The connections with the classical theory of consolidation are noted. 61 refs.
852036 Appraisal of electro-osmotic oedometer tests Banerjee, S; Vitayasupakorn, V J Geotech Engng Die ASCE VIlO, NGT8, Aug 1984, P10071023 The results of laboratory electro-osmotic tests on fine-grained soils are usually analysed by one-dimensional solutions developed from the theory of electro-osmotic consolidation. This often leads to considerable difficulties in data reduction and interpretation. A more appropriate theoretical solution for the development of excess pore pressures in a triaxial electroosmotic oedometer is proposed.
852037 Multidimensional probabilistie consolidation Hwang, D; Witczak, M W J Geotecli Engng Div ASCE VIIO, NGT8, Aug 1984, P10591078 A numerical solution is developed for the consolidation of soil media with multidimensional spacial variability and water flow. The Alternating Direction Explicit Procedure, combined with an Integrated Finite Difference Method, is extended to multidimensional solutions. Results indicate that the probabilistic solution value is almost identical to the conventional deterministic solution and that the uncertainty due to material variability, for most soils, is not as significant as previously reported.
Dynamic properties See also: 852063
852039 Comparison of approximate techniques for non-iluear seismic soil response Corsanego, A; Solari, G; Stura, D Earttu! Engng Struct Dynam V12, N4, July-Aug 1984, P451466 The dynamic non-linear response of soil can be calculated using step-by-step integration techniques involving great computational effort. Alternative techniques of equivalent linearization are examined. A numerical analysis is used to compare results from these techniques with the step-by-step integration.
852O40 Propagation of SH-waves in a layered medium Ha, J Geophys J R Astr Soc V78, N1, July 1984, P291-305 A set of recurrence relations suitable for the generation of SHwaves in a (n+ l)-layered half-space are presented. Numerical comparison of the algorithm of this study with the propagator matrix method is made.
852041 Anisotropy due to bedding - a computer study Levin, F K Gcophys Prospect V32, N2, April 1984, P187-197 An investigation was carried out to see if the bedding present in real earth sections is the cause of the transverse anisotropy magnitudes often observed in the field. Velocity data from 23 wells was used to estimate the resulting transverse isotropy and to compare these data with anisotropy observations reported in the literature. The anisotropy data estimated were generally considerably smaller than the observational data. The assumptions of functional dependence of Poisson's ratio on transit time and constant density tended to underestimate anisotropy and it appears unlikely that bedding alone could cause anisotropy of the magnitude reported.
852042 Anisotropy and dispersion in periodically layered media Helbig, K Geophysics 1/49, N4, April 1984, P364-373 A mathematical formulation for the description of simultaneous occurrence of anisotropy and dispersion has been developed and applied to SH waves in periodically layered media. Results indicate that a nondispersive transversely isotropic replacement medium is strictly valid for wavelengths larger than three times the spacial period of layering. For small angles against the vertical, dispersion for shorter wavelengths is significant. However, for directions making an angle of more than about 30 deg with the vertical, dispersion sets in at much shorter wavelengths and is in general gentler.
8.q038 Numerical assessment of file influence of anisotropy on steeply dipping VCR stopes Pariseau, W G; Duan, F; Schmuck, C H In: Geomechanics Applications in Underground Hardrock Mining, edited by Pariseau, W G P39-63. Publ New York: AIMM, 1984
Compressibility, swelling and consolidation
Examines the influence of anisotropy on the stability of steeply dipping vertical crater retreat stopes at the Homestake Mine, USA. A sequence of analyses began with elementary test problems for computer program checks and proceeded to the analysis of a study stope area, based on physical data, measured in situ stresses and rock properties. It is concluded that anisotropy is important to stability analysis at the Homestake Mine.
852034 Suction-moisture content-strength and time relationships of a iateritic soil Mohajerani, A Aust Geomech News N7, June 1984, P31-33 Experiments were carried out to examine the relationship between the soil suction, water content, time and unconfined compressive strength for compacted 'red earth' of South-Western Australia.
852035 Shale compaction and statistical physics Korvin, G Geophys J R Astr Soc V78, N1, July 1984, P35-50 The historical development of the ideas on compaction of clays and shales is outlined. It is shown that the exponential porosity depth dependence of compacted shales expressed by Athy's law can be derived using standard methods of statistical physics. The main result states that the exponential compaction law expresses the maximum - entropy equilibrium state of the pores in the rock, that is, compaction is an irreversible process where clay particles tend towards a statistically defined final equilibrium. The connections with the classical theory of consolidation are noted. 61 refs.
852036 Appraisal of electro-osmotic oedometer tests Banerjee, S; Vitayasupakorn, V J Geotech Engng Die ASCE VIlO, NGT8, Aug 1984, P10071023 The results of laboratory electro-osmotic tests on fine-grained soils are usually analysed by one-dimensional solutions developed from the theory of electro-osmotic consolidation. This often leads to considerable difficulties in data reduction and interpretation. A more appropriate theoretical solution for the development of excess pore pressures in a triaxial electroosmotic oedometer is proposed.
852037 Multidimensional probabilistie consolidation Hwang, D; Witczak, M W J Geotecli Engng Div ASCE VIIO, NGT8, Aug 1984, P10591078 A numerical solution is developed for the consolidation of soil media with multidimensional spacial variability and water flow. The Alternating Direction Explicit Procedure, combined with an Integrated Finite Difference Method, is extended to multidimensional solutions. Results indicate that the probabilistic solution value is almost identical to the conventional deterministic solution and that the uncertainty due to material variability, for most soils, is not as significant as previously reported.
Dynamic properties See also: 852063
852039 Comparison of approximate techniques for non-iluear seismic soil response Corsanego, A; Solari, G; Stura, D Earttu! Engng Struct Dynam V12, N4, July-Aug 1984, P451466 The dynamic non-linear response of soil can be calculated using step-by-step integration techniques involving great computational effort. Alternative techniques of equivalent linearization are examined. A numerical analysis is used to compare results from these techniques with the step-by-step integration.
852O40 Propagation of SH-waves in a layered medium Ha, J Geophys J R Astr Soc V78, N1, July 1984, P291-305 A set of recurrence relations suitable for the generation of SHwaves in a (n+ l)-layered half-space are presented. Numerical comparison of the algorithm of this study with the propagator matrix method is made.
852041 Anisotropy due to bedding - a computer study Levin, F K Gcophys Prospect V32, N2, April 1984, P187-197 An investigation was carried out to see if the bedding present in real earth sections is the cause of the transverse anisotropy magnitudes often observed in the field. Velocity data from 23 wells was used to estimate the resulting transverse isotropy and to compare these data with anisotropy observations reported in the literature. The anisotropy data estimated were generally considerably smaller than the observational data. The assumptions of functional dependence of Poisson's ratio on transit time and constant density tended to underestimate anisotropy and it appears unlikely that bedding alone could cause anisotropy of the magnitude reported.
852042 Anisotropy and dispersion in periodically layered media Helbig, K Geophysics 1/49, N4, April 1984, P364-373 A mathematical formulation for the description of simultaneous occurrence of anisotropy and dispersion has been developed and applied to SH waves in periodically layered media. Results indicate that a nondispersive transversely isotropic replacement medium is strictly valid for wavelengths larger than three times the spacial period of layering. For small angles against the vertical, dispersion for shorter wavelengths is significant. However, for directions making an angle of more than about 30 deg with the vertical, dispersion sets in at much shorter wavelengths and is in general gentler.