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Note on falling headwater and rising tailwater permeability tests. Technical note
209A 904O96 Laboratory and in situ rock thermal property measurements in hot mine lnnaurato. N; OcceUa. E Proc International Symposium on Rock at Great Depth, Pau, 28-31 August 1989 VI, P379-385. Publ Rotterdam: A A Balkema, 1989
porous rock matrix will lead to nonuniform downward flux. Where pore pressures within the matrix are positive, flow may be diverted into adjacent fractures. The study forms a basis for designing hydrogeological property and recharge distribution testing programs compatible with design models that can characterise downward flux.
The Campiano mine in Tuscany shows anomalously high temperatures. Large scale field tests have examined the thermal properties of inhomogenous, fractured, porous rocks, some with fluid inclusions. Diffusivity and surface heat transfer coefficient were determined for clay shales, phyilites and pyrite. These rocks, evaporite, anhydrite and breccia were also examined on a laboratory scale. Comparative analysis is made between field and laboratory values. Some correlations are attempted between thermal characteristics and physical and textural features of the rocks.
904100 Solutions of a steady state free surface seepage problem on a Hypercuhe concurrent computer Wang, K P; Bruch, J C Engng Comput V6, N3, Sept 1989. P225-236
904097 Use of well log data for predicting detailed in situ thermal conductivity profiles at well sites and estimation of lateral changes in main sedimentary units at basin scale Brigaud, F; Vasseur, G; Caillet, G Proc International Symposium on Rock at Great Depth, Pau, 28-31 August 1989 VI, P403-409. Publ Rotterdam: A A Balkema. 1989 Thermal conductivity of sedimentary rock is an important parameter in basin modelling as it directly controls vertical temperature distribution. As core samples are rare from exploration boreholes, conductivity must be evaluated from routinely recorded data such as well logs. The thermal conductivity model is discussed on the basis of laboratory measurement. Well logs are interpreted in terms of lithology and porosity, mineralogy varying with stratigraphy of each lithologic unit is assumed, and a procedure for calculating in situ thermal conductivity profiles is presented. Application to wells in the Viking graben in the North Sea is illustrated. 904098 Finite element analysis of coupled thermoelasticity Carter, J P; Booker, J R Un&ersity of Sydney, School of Civil and Mining Engineering, Research Report N599. May 1989, 30P A fully coupled approach to the problem of thermoelasticity in geological materials is presented. The governing equations are presented and a finite element solution scheme (AFENA) is suggested. The accuracy of the numerical scheme is assessed by its application to problems for which analytical solutions are available. A parametric study of these problems is carried out to examine when fully coupling the thermal and elastic processes is important. Results are obtained for problems of heat flow into a square tunnel on cooling of its surfaces and storage of radioactive waste in a borehole.
Permeability and capillarity 904099 Distribution of downward flux in unsaturated heterogeneous hydrogeology environments Bloomsburg, G; Williams, R E; Osiensky, J L Bull Geol Soc Am VIOl, NI2, Dec 1989, P!623-1630 The finite element program UNSAT2 was used to quantify horizontal distribution of unsaturated downward flux in porous tuff at the proposed repository site at Yucca Mountain, Nevada, as a function of hydraulic inhomogeneities at two recharge rates. Results show heterogeneity in an isotropic
© RMMS 27 4--H
Flows through porous media, in particular those with a free surface, are of great interest to the geotechnical engineer. The computational task involves the solution of a large set of linear equations with a projection operation numerous times. The case of steady, two dimensional seepage through a slanted, curved face dam with a toe drain is considered. Solutions using both Jacobi and SOR iterations are obtained quickly and efficiently using a parallel processing system. Comparisons are made with solution times for single CPU systems. 904101 Note on falling headwater and rising tailwater permeability tests. Technical note Daniel, D E Geotech Test J VI2, N4, Dec 1989, P308-310 Falling head permeability tests may be performed with constant or rising tailwater pressure. Equations generally quoted for determination of permeability using the falling head test are only valid in the former case, and an error factor of 2 is induced if they are used in the rising tailwater case. Correct equations for use in both cases are derived and presented. 904102 Laboratory and numerical investigation of solute transport in discontinuous fracture systems Robinson, J W; Gale, J E Ground Water V28, NI, Jan-Feb 1990. P25-36 Mixing of fluids at fracture intersections was studied using plexiglass models and a two dimensional, finite element discrete fracture model. Physical models with two continuous fully intersecting fractures, a single continuous fracture offsetting a second fracture, and parallel fractures in two intersecting sets were used. No mixing occurred at fully intersecting fractures with equal apertures. Mixing was dependent on relative size of inlet and outlet even with multiple intersections. The mixing algorithm from model tests was used in the finite element code EXPORT. Predictions suggest more longitudinal and less lateral dispersion take place than when complete mixing at fracture intersections is assumed. Contaminants will not be diluted to the extent previous models have predicted. 9041O3 Evaluation of methods for determining the vertical distribution of hydraulic conductivity Taylor, K; Wheatcraft, S; Hess, J; Hayworth, J; Molz, F Ground Water V28. NI, Jan-Feb 1990, P88-98 Six methods have been critically examined. Straddle packer tests are invalid if flow paths exist around the packer on the outside of the well screen. Particle size analysis methods are inaccurate due to sampling problems and small-scale microstructural effects. Empirical electrical-hydraulic conductivity relations are site and formation specific. Stonely wave attenuation methods are invalid in unconsolidated formations. Borehole effects invalidate methods based on natural flow through
1990 Pergamon Press plc. Reproduction not permitted
porous rock matrix will lead to nonuniform downward flux. Where pore pressures within the matrix are positive, flow may be diverted into adjacent fractures. The study forms a basis for designing hydrogeological property and recharge distribution testing programs compatible with design models that can characterise downward flux.
The Campiano mine in Tuscany shows anomalously high temperatures. Large scale field tests have examined the thermal properties of inhomogenous, fractured, porous rocks, some with fluid inclusions. Diffusivity and surface heat transfer coefficient were determined for clay shales, phyilites and pyrite. These rocks, evaporite, anhydrite and breccia were also examined on a laboratory scale. Comparative analysis is made between field and laboratory values. Some correlations are attempted between thermal characteristics and physical and textural features of the rocks.
904100 Solutions of a steady state free surface seepage problem on a Hypercuhe concurrent computer Wang, K P; Bruch, J C Engng Comput V6, N3, Sept 1989. P225-236
904097 Use of well log data for predicting detailed in situ thermal conductivity profiles at well sites and estimation of lateral changes in main sedimentary units at basin scale Brigaud, F; Vasseur, G; Caillet, G Proc International Symposium on Rock at Great Depth, Pau, 28-31 August 1989 VI, P403-409. Publ Rotterdam: A A Balkema. 1989 Thermal conductivity of sedimentary rock is an important parameter in basin modelling as it directly controls vertical temperature distribution. As core samples are rare from exploration boreholes, conductivity must be evaluated from routinely recorded data such as well logs. The thermal conductivity model is discussed on the basis of laboratory measurement. Well logs are interpreted in terms of lithology and porosity, mineralogy varying with stratigraphy of each lithologic unit is assumed, and a procedure for calculating in situ thermal conductivity profiles is presented. Application to wells in the Viking graben in the North Sea is illustrated. 904098 Finite element analysis of coupled thermoelasticity Carter, J P; Booker, J R Un&ersity of Sydney, School of Civil and Mining Engineering, Research Report N599. May 1989, 30P A fully coupled approach to the problem of thermoelasticity in geological materials is presented. The governing equations are presented and a finite element solution scheme (AFENA) is suggested. The accuracy of the numerical scheme is assessed by its application to problems for which analytical solutions are available. A parametric study of these problems is carried out to examine when fully coupling the thermal and elastic processes is important. Results are obtained for problems of heat flow into a square tunnel on cooling of its surfaces and storage of radioactive waste in a borehole.
Permeability and capillarity 904099 Distribution of downward flux in unsaturated heterogeneous hydrogeology environments Bloomsburg, G; Williams, R E; Osiensky, J L Bull Geol Soc Am VIOl, NI2, Dec 1989, P!623-1630 The finite element program UNSAT2 was used to quantify horizontal distribution of unsaturated downward flux in porous tuff at the proposed repository site at Yucca Mountain, Nevada, as a function of hydraulic inhomogeneities at two recharge rates. Results show heterogeneity in an isotropic
© RMMS 27 4--H
Flows through porous media, in particular those with a free surface, are of great interest to the geotechnical engineer. The computational task involves the solution of a large set of linear equations with a projection operation numerous times. The case of steady, two dimensional seepage through a slanted, curved face dam with a toe drain is considered. Solutions using both Jacobi and SOR iterations are obtained quickly and efficiently using a parallel processing system. Comparisons are made with solution times for single CPU systems. 904101 Note on falling headwater and rising tailwater permeability tests. Technical note Daniel, D E Geotech Test J VI2, N4, Dec 1989, P308-310 Falling head permeability tests may be performed with constant or rising tailwater pressure. Equations generally quoted for determination of permeability using the falling head test are only valid in the former case, and an error factor of 2 is induced if they are used in the rising tailwater case. Correct equations for use in both cases are derived and presented. 904102 Laboratory and numerical investigation of solute transport in discontinuous fracture systems Robinson, J W; Gale, J E Ground Water V28, NI, Jan-Feb 1990. P25-36 Mixing of fluids at fracture intersections was studied using plexiglass models and a two dimensional, finite element discrete fracture model. Physical models with two continuous fully intersecting fractures, a single continuous fracture offsetting a second fracture, and parallel fractures in two intersecting sets were used. No mixing occurred at fully intersecting fractures with equal apertures. Mixing was dependent on relative size of inlet and outlet even with multiple intersections. The mixing algorithm from model tests was used in the finite element code EXPORT. Predictions suggest more longitudinal and less lateral dispersion take place than when complete mixing at fracture intersections is assumed. Contaminants will not be diluted to the extent previous models have predicted. 9041O3 Evaluation of methods for determining the vertical distribution of hydraulic conductivity Taylor, K; Wheatcraft, S; Hess, J; Hayworth, J; Molz, F Ground Water V28. NI, Jan-Feb 1990, P88-98 Six methods have been critically examined. Straddle packer tests are invalid if flow paths exist around the packer on the outside of the well screen. Particle size analysis methods are inaccurate due to sampling problems and small-scale microstructural effects. Empirical electrical-hydraulic conductivity relations are site and formation specific. Stonely wave attenuation methods are invalid in unconsolidated formations. Borehole effects invalidate methods based on natural flow through
1990 Pergamon Press plc. Reproduction not permitted