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Rock mechanics and geological disposal of radioactive waste (In French)
224A
846160 Numerical simulation of soil-water flow during drying in a nonhomogeueons soil Higuchi, M J Hydrol V71. N3-4, 25 March 1984, P303-334 A numerical model of soil and atmospheric surface boundary layers is developed which simulates soil water movement under soil-temperature gradients. A modified and extended form of Philip and de Vries" equations for soil water and heat flows is deduced. The results are: upward total moisture fluxes occur above a depth of 35cm, decreasing with depth: isothermal liquid fluxes contribute much to the total moisture fluxes at all depths: isothermal vapour fluxes are negligible; thermal moisture fluxes are negligible below 30cm depth: thermal moisture flux direction appears to be downward during the day and upward at night: thermal liquid fluxes are greater than the thermal vapour fluxes.
846161 On the solution of transient free-surface flow problems in porous media by a fixed-domain method Lin, C S; Bruch, J C; Sloss, J M; Comincioli, V J Hydrol V71, N3-4, 25 March 1984, P353-376 A solution to the exact initial-boundary-value problems arising in recharge fluid flow through porous media having a free surface is presented. An example problem of transient free-surface seepage through a two-dimensional dam with accretion is solved.
846162 Interpretation of tests in fissured and muitilayered reservoirs with double-porosity behavior:, theory and practice Gringarten, A C J Pet Teclmol V36. N4, April 1984, P549-562 Summarizes current knowledge of reservoirs with double porosity behaviour. These include both naturally fissured reservoirs and multilayered reservoirs with high permeability contrast between layers. The first part presents available solutions to the direct problem, ie solutions to the diffusivity equation. The second part discusses methods for solving the inverse problem, ie identifying a double porosity behaviour and evaluating all corresponding well and reservoir parameters. 26 refs.
846163 Pore pressure variations in clay soil in the Gothenburg region (In Swedish) Berntson, J A Swed Gcotech inst Rep N20, 1983, 289P Natural variations in the pore pressures of marine clay deposits have been studied at a great number of test sites with different geological, geohydrological and geotechnical conditions. Changes in the P-profile due to artificial or natural disturbances have been analysed. A model has been developed to describe and prognosticate P-profiles.
C h e m i c a l and physical c h a n g e s due to water 846164 Geodetic evidence for subsidence due to groundwater withdrawal in many parts of the United States of America Chi, S C; Reilinger, R E J Hydrol V67, N1-4, Jan 1984, P155-182 Analysis of repeated levellings conducted by the National Geodetic Survey has identified 48 distinct locations of relative subsidence in the USA, more than 30 of these locations being previously unknown. Special criteria were used to identify those
subsidence features most likely to result from sediment compaction due to water-level variations in underground aquifer sxstems. 69 refs.
846165 Effects of lithology on solution development in carbonate aquifers Dreiss. S J J Hydrol V70. N1-4.20 Feb 1984. P295-308 Groundwater flow in karst aquifers is extremely difficult to predict because of the presence of solution-enlarged fractures and conduits in the bedrock. This paper examines lithological properties which influence apparent solution rates in carbonate aquifers as indicated by weathered profiles in caverns. Rock samples from the caverns were analysed for grain size, sorting, ",, quartz, oo magnesium carbonate, o opaque minerals and ",, acid-insoluble residue. Analysis of the results indicates grain size to be the most influential parameter: small grain size favours dissolution. Magnesium carbonate content also appears to affect the apparent solution rate though to a lesser extent than grain size. 846166 Salinity and weathering rate of rocks in a semi-arid region Moreira-Nordemann, L M J Hydrol V71, N1-2, 15 March 1984, P131-147 Total dissolved solids (TDS) concentrations in the river water from the Salgado Basin, a semi-arid region in Brazil. were measured, together with Na, Ca, K and Mg contents in surface waters and in the rocks and soils present. The chemical weathering rate of the rocks was determined using uranium as a natural tracer element: 36t:sq km/yr. This was not high enough to explain the high transport of dissolved solids in the region.
Underground Excavations See also." 846099. 846100 846167 Rock mechanics and geological disposal of radioactive waste (In French) Come, B Ret, Fr Geotech N25, Not" 1983, P17-26 Disposal of high-level radioactive waste in deep geological formations is. at present, the most promising method to isolate this waste. The Commission of the European Communities has implemented an R & D programme with a view to assessing the safety of this approach. The paper presents some interesting results gained through this programme about: (I) the measurement and modelling of mechanical behaviour of rock formations, and (2) the long-term behaviour of these formations.
846168 Geotechnical design of the University of Minnesota CME Building Nelson, C R Underground Space V8, N2, March-April 1984, P77-82 The recently completed Civil and Mineral Engineering Building at the University of Minnesota, USA, comprises 4 upper floors of cut-and-cover construction, and 2 lower floors some 100ft below the surface, with a layer of limestone separating the 2 parts. The roof of the mined out space was rock bolted and the walls were reinforced with tie backs and shotcrete.
846160 Numerical simulation of soil-water flow during drying in a nonhomogeueons soil Higuchi, M J Hydrol V71. N3-4, 25 March 1984, P303-334 A numerical model of soil and atmospheric surface boundary layers is developed which simulates soil water movement under soil-temperature gradients. A modified and extended form of Philip and de Vries" equations for soil water and heat flows is deduced. The results are: upward total moisture fluxes occur above a depth of 35cm, decreasing with depth: isothermal liquid fluxes contribute much to the total moisture fluxes at all depths: isothermal vapour fluxes are negligible; thermal moisture fluxes are negligible below 30cm depth: thermal moisture flux direction appears to be downward during the day and upward at night: thermal liquid fluxes are greater than the thermal vapour fluxes.
846161 On the solution of transient free-surface flow problems in porous media by a fixed-domain method Lin, C S; Bruch, J C; Sloss, J M; Comincioli, V J Hydrol V71, N3-4, 25 March 1984, P353-376 A solution to the exact initial-boundary-value problems arising in recharge fluid flow through porous media having a free surface is presented. An example problem of transient free-surface seepage through a two-dimensional dam with accretion is solved.
846162 Interpretation of tests in fissured and muitilayered reservoirs with double-porosity behavior:, theory and practice Gringarten, A C J Pet Teclmol V36. N4, April 1984, P549-562 Summarizes current knowledge of reservoirs with double porosity behaviour. These include both naturally fissured reservoirs and multilayered reservoirs with high permeability contrast between layers. The first part presents available solutions to the direct problem, ie solutions to the diffusivity equation. The second part discusses methods for solving the inverse problem, ie identifying a double porosity behaviour and evaluating all corresponding well and reservoir parameters. 26 refs.
846163 Pore pressure variations in clay soil in the Gothenburg region (In Swedish) Berntson, J A Swed Gcotech inst Rep N20, 1983, 289P Natural variations in the pore pressures of marine clay deposits have been studied at a great number of test sites with different geological, geohydrological and geotechnical conditions. Changes in the P-profile due to artificial or natural disturbances have been analysed. A model has been developed to describe and prognosticate P-profiles.
C h e m i c a l and physical c h a n g e s due to water 846164 Geodetic evidence for subsidence due to groundwater withdrawal in many parts of the United States of America Chi, S C; Reilinger, R E J Hydrol V67, N1-4, Jan 1984, P155-182 Analysis of repeated levellings conducted by the National Geodetic Survey has identified 48 distinct locations of relative subsidence in the USA, more than 30 of these locations being previously unknown. Special criteria were used to identify those
subsidence features most likely to result from sediment compaction due to water-level variations in underground aquifer sxstems. 69 refs.
846165 Effects of lithology on solution development in carbonate aquifers Dreiss. S J J Hydrol V70. N1-4.20 Feb 1984. P295-308 Groundwater flow in karst aquifers is extremely difficult to predict because of the presence of solution-enlarged fractures and conduits in the bedrock. This paper examines lithological properties which influence apparent solution rates in carbonate aquifers as indicated by weathered profiles in caverns. Rock samples from the caverns were analysed for grain size, sorting, ",, quartz, oo magnesium carbonate, o opaque minerals and ",, acid-insoluble residue. Analysis of the results indicates grain size to be the most influential parameter: small grain size favours dissolution. Magnesium carbonate content also appears to affect the apparent solution rate though to a lesser extent than grain size. 846166 Salinity and weathering rate of rocks in a semi-arid region Moreira-Nordemann, L M J Hydrol V71, N1-2, 15 March 1984, P131-147 Total dissolved solids (TDS) concentrations in the river water from the Salgado Basin, a semi-arid region in Brazil. were measured, together with Na, Ca, K and Mg contents in surface waters and in the rocks and soils present. The chemical weathering rate of the rocks was determined using uranium as a natural tracer element: 36t:sq km/yr. This was not high enough to explain the high transport of dissolved solids in the region.
Underground Excavations See also." 846099. 846100 846167 Rock mechanics and geological disposal of radioactive waste (In French) Come, B Ret, Fr Geotech N25, Not" 1983, P17-26 Disposal of high-level radioactive waste in deep geological formations is. at present, the most promising method to isolate this waste. The Commission of the European Communities has implemented an R & D programme with a view to assessing the safety of this approach. The paper presents some interesting results gained through this programme about: (I) the measurement and modelling of mechanical behaviour of rock formations, and (2) the long-term behaviour of these formations.
846168 Geotechnical design of the University of Minnesota CME Building Nelson, C R Underground Space V8, N2, March-April 1984, P77-82 The recently completed Civil and Mineral Engineering Building at the University of Minnesota, USA, comprises 4 upper floors of cut-and-cover construction, and 2 lower floors some 100ft below the surface, with a layer of limestone separating the 2 parts. The roof of the mined out space was rock bolted and the walls were reinforced with tie backs and shotcrete.