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Heated water storage in underground openings
358A
926146 Slurry wall backfill integrity and desiccation Khera, R P; Thilliyar, M In: Physico-Chemical Aspects of Soil and Related Materials (Papers to a Symposium Presented at St Louis, 29 June 1989) P81-90. Publ Philadelphia." ASTM, 1990 ( A S T M Special Technical Pubfication N1095) Soil specimens prepared from sodium bentonite, kaolinite, and sand were permeated with solutions of water, aniline, phenol, and hydrochloric acid. Specimens subjected to wet/dry cycling showed significant cracking, except for those treated with hydrochloric acid. Cracking was greatest for phenol, lowest for water, and decreased with increasing kaolinite content. During permeation, the initially high permeability decreased due to crack closure, down to a value similar to that of the intact specimen. This healing is not expected in slurry cutoff walls under field conditions.
926147 Effective hydraulic conductivity for fractured media Follin, S Proc Conference on Calibration and Reliability in Groundwater Modelling, The Hague, 3-6 September 1990 P251-260. Publ Walling)Cord: IAHS Press, 1990 (IAHS Publication No. 195) Geological materials are inherently inhomogeneous, fractured or porous. When simulating groundwater flow, the problem arises of how to assign effective conductivity values to model blocks. The premises for continuum approximation and some concepts for modelling fractured formations are discussed. The number of discretized conductive elements necessary to obtain values of effective hydraulic conductivity equal to those of continuum approximation is estimated. This number, the representative sample size, is determined by means of approximate confidence intervals.
926148 Transport and storage phenomena in a fracture matrix system: experimental investigations and numerical modelling Mull, R; Pfingsten, W Proc Conference on Calibration and Reliability in Groundwater Modelling, The Hague, 3-6 September 1990 P261-269. Publ Wallingford: IAHS Press, 1990 (IAHS Pubfication No. 195) Transport of pollutants through a fractured rock mass is studied. The pollutant loading is for a set time, during which it is both carried by the water flow and transferred into the rock mass by diffusion. When clean water then flows through the rock, matrix-stored contaminant is returned to the flowing water. This is examined for different fracture-matrix models. Contamination of the flowing water will continue for long periods after its source has been removed. Theoretical simulations and laboratory scale physical modelling are described.
926149 Calibration of groundwater models for the Grimsel underground rock laboratory, Switzerland Adank, P; Hurlimann, W; Vomvoris, S Proc Conference on Calibration and Reliability in Groundwater Modelling, The Hague, 3-6 September 1990 P291-299. Publ Wallingford: IAHS Press, 1990 ([AHS Publication No. 195) Geology and fracturing at the Grimsel site are well characterised, making it suitable for evaluation and calibration of groundwater flow models for fractured rock masses against field measurements. The method of calibration is based on ~
definition of an objective function containing the most important hydrogeological parameters. The proposed function contains terms which take into account the residuals of heads and fluxes which can be measured in boreholes and underground structures. Calibration procedures are illustrated.
926150 Heated water storage in underground openings Inada, Y; Kinoshita, N; Nakazaki, H; Ueda, T Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V4. P2745-2750. Publ Rotterdam: A A Balkema. 1990 Surplus heat from industrial sources may be stored by pumping heated water into underground openings. The effects of the high temperatures and pressures involved on the permeability of the rock mass and hence on leakage rate have been examined for a hypothetical storage of 10m diameter al 100m depth in granite. Effects of temperature, axial pressure,and confining pressure on permeability were investigated on cores taken at different orientations to rift. Calculated leakage during design storage time is 2-4%.
926151 Changes in rock salt permeability due to nearby excavation Stormont, J C; Howard, C L; Daemen, J J K Rock Mechanics as a Multidisciplinary Science: Proc 32nd US Symposium, Norman, 10-12 July 1991 P899-907. Publ Rotterdam. A A Balkema, 1991 Changes in brine and gas permeability in the disturbed zone around rooms of the Waste Isolation Pilot Plant have been measured. The virgin formation behaves as a porous material with very low brine permeability, negligible gas permeability., and high pore fluid brine pressure. Excavation creates a zone of dilated, partially saturated rock with high brine permeability and measurable gas permeability. The main cause of the permeability changes is pore structure damage, with increased size and connectivity of pores.
926152 Topological structure of fracture systems in rock Lin, D; Fairhurst, C Rock Mechanics as a Multidisciplinary Science, Proc 32nd US Symposium, Norman, 10-12 July 1991 P1155-1163. Pub/ Rotterdam." A A Balkema, 1991 The spatial characteristics of the fracture system at all scales are important in rock mechanics. An introduction to the topological representation of spatial structures is presented and used as a base for development of the data structures and algorithms for identification of a blocky system. Computational schemes for analysis of the spatial structures based ot~ combinatorial topology techniques are described. New meth ods for matrix pattern recognition in fracture systems are developed. Fluid flow and transfer through a fracture system are simulated, based on the topological structure of the fracture system and boundary integration of this structure.
926153 Hydromechanicai representation of rock fractures Piggott, A R; Elsworth, D Rock Mechanics as a Multidiseiplinary Science, Proc 32nd US Symposium, Norman, 10-12 July 1991 P1165-1174. Pub/ Rotterdam." A A Balkema, 1991 A model is presented to describe the hydraulic and mechanical behaviour of a rock joint under shear loading. It is based on statistical and geostatistical description of fracture surface topography, an elastic deformation mechanism, and equivalent fracture concepts. It is illustrated for a hypothetical fracture.
1992 Pergamon Press Ltd. Reproduction not permitted
926146 Slurry wall backfill integrity and desiccation Khera, R P; Thilliyar, M In: Physico-Chemical Aspects of Soil and Related Materials (Papers to a Symposium Presented at St Louis, 29 June 1989) P81-90. Publ Philadelphia." ASTM, 1990 ( A S T M Special Technical Pubfication N1095) Soil specimens prepared from sodium bentonite, kaolinite, and sand were permeated with solutions of water, aniline, phenol, and hydrochloric acid. Specimens subjected to wet/dry cycling showed significant cracking, except for those treated with hydrochloric acid. Cracking was greatest for phenol, lowest for water, and decreased with increasing kaolinite content. During permeation, the initially high permeability decreased due to crack closure, down to a value similar to that of the intact specimen. This healing is not expected in slurry cutoff walls under field conditions.
926147 Effective hydraulic conductivity for fractured media Follin, S Proc Conference on Calibration and Reliability in Groundwater Modelling, The Hague, 3-6 September 1990 P251-260. Publ Walling)Cord: IAHS Press, 1990 (IAHS Publication No. 195) Geological materials are inherently inhomogeneous, fractured or porous. When simulating groundwater flow, the problem arises of how to assign effective conductivity values to model blocks. The premises for continuum approximation and some concepts for modelling fractured formations are discussed. The number of discretized conductive elements necessary to obtain values of effective hydraulic conductivity equal to those of continuum approximation is estimated. This number, the representative sample size, is determined by means of approximate confidence intervals.
926148 Transport and storage phenomena in a fracture matrix system: experimental investigations and numerical modelling Mull, R; Pfingsten, W Proc Conference on Calibration and Reliability in Groundwater Modelling, The Hague, 3-6 September 1990 P261-269. Publ Wallingford: IAHS Press, 1990 (IAHS Pubfication No. 195) Transport of pollutants through a fractured rock mass is studied. The pollutant loading is for a set time, during which it is both carried by the water flow and transferred into the rock mass by diffusion. When clean water then flows through the rock, matrix-stored contaminant is returned to the flowing water. This is examined for different fracture-matrix models. Contamination of the flowing water will continue for long periods after its source has been removed. Theoretical simulations and laboratory scale physical modelling are described.
926149 Calibration of groundwater models for the Grimsel underground rock laboratory, Switzerland Adank, P; Hurlimann, W; Vomvoris, S Proc Conference on Calibration and Reliability in Groundwater Modelling, The Hague, 3-6 September 1990 P291-299. Publ Wallingford: IAHS Press, 1990 ([AHS Publication No. 195) Geology and fracturing at the Grimsel site are well characterised, making it suitable for evaluation and calibration of groundwater flow models for fractured rock masses against field measurements. The method of calibration is based on ~
definition of an objective function containing the most important hydrogeological parameters. The proposed function contains terms which take into account the residuals of heads and fluxes which can be measured in boreholes and underground structures. Calibration procedures are illustrated.
926150 Heated water storage in underground openings Inada, Y; Kinoshita, N; Nakazaki, H; Ueda, T Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V4. P2745-2750. Publ Rotterdam: A A Balkema. 1990 Surplus heat from industrial sources may be stored by pumping heated water into underground openings. The effects of the high temperatures and pressures involved on the permeability of the rock mass and hence on leakage rate have been examined for a hypothetical storage of 10m diameter al 100m depth in granite. Effects of temperature, axial pressure,and confining pressure on permeability were investigated on cores taken at different orientations to rift. Calculated leakage during design storage time is 2-4%.
926151 Changes in rock salt permeability due to nearby excavation Stormont, J C; Howard, C L; Daemen, J J K Rock Mechanics as a Multidisciplinary Science: Proc 32nd US Symposium, Norman, 10-12 July 1991 P899-907. Publ Rotterdam. A A Balkema, 1991 Changes in brine and gas permeability in the disturbed zone around rooms of the Waste Isolation Pilot Plant have been measured. The virgin formation behaves as a porous material with very low brine permeability, negligible gas permeability., and high pore fluid brine pressure. Excavation creates a zone of dilated, partially saturated rock with high brine permeability and measurable gas permeability. The main cause of the permeability changes is pore structure damage, with increased size and connectivity of pores.
926152 Topological structure of fracture systems in rock Lin, D; Fairhurst, C Rock Mechanics as a Multidisciplinary Science, Proc 32nd US Symposium, Norman, 10-12 July 1991 P1155-1163. Pub/ Rotterdam." A A Balkema, 1991 The spatial characteristics of the fracture system at all scales are important in rock mechanics. An introduction to the topological representation of spatial structures is presented and used as a base for development of the data structures and algorithms for identification of a blocky system. Computational schemes for analysis of the spatial structures based ot~ combinatorial topology techniques are described. New meth ods for matrix pattern recognition in fracture systems are developed. Fluid flow and transfer through a fracture system are simulated, based on the topological structure of the fracture system and boundary integration of this structure.
926153 Hydromechanicai representation of rock fractures Piggott, A R; Elsworth, D Rock Mechanics as a Multidiseiplinary Science, Proc 32nd US Symposium, Norman, 10-12 July 1991 P1165-1174. Pub/ Rotterdam." A A Balkema, 1991 A model is presented to describe the hydraulic and mechanical behaviour of a rock joint under shear loading. It is based on statistical and geostatistical description of fracture surface topography, an elastic deformation mechanism, and equivalent fracture concepts. It is illustrated for a hypothetical fracture.
1992 Pergamon Press Ltd. Reproduction not permitted