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Numerical and centrifuge modelling of coupled heat flow and consolidation around hot cylinders buried in clay
236A 895056 Dependence of coefficient of sliding friction in rooks on Uthology and mineral characteristics: technical note Ramana, Y V; Gogte, B S EngngGeoi I,'26, N3, March 1989, P271-279 The coefficient of sliding friction of the major Indian rocks was determined using a simple tilting plane apparatus with variable inclination. Samples with a natural fracture surface and a saw cut surface were used. The results obtained were compared with the mineralogy of the rocks. This suggested that the coefficient of sliding friction is a function of the mineral composition and surface properties of the contacting materials. 895057 Use of the methylene blue adsorption test in assessing the quality of basaltic tuff rook aggregate Stapel, E E; Verhoef, P N W Engng Geol V26, N3, March 1989, P233-246 Following failure problems in a road subbase, the basalt aggregate was studied using petrographic analysis and the methylene blue adsorption (MBA) test. Results show no indication of significant presence of swelling clay minerals and little difference between fresh samples and those taken from the subbase. Failure is attributed to design or construction method. MBA is shown to be a fast and reliable method to indicate the presence of swelling clay minerals in rocks and soils. 895058 Directional errors in remanent magnetization of non-cubic soft sediment specimens measured with spinner magnetometers Steele, W K Geophys J I,'96, N2 Feb 1989, t'333-341 Spinner magnetometers use rectangular, non-cubic samples for the determination of magnetic properties. A theoretical and experimental assessment is made of errors in measured values resulting from the use of these samples rather than cubic blocks. Results can be significantly influenced by specimen shape. 895059 Batch-type testing method for determination of adsorption of gaseous compounds on partially saturated soils Houston, S L; Kreamer, D K; Marwig, R Geotech Test J VI2, NI, March 1989, P3-10 A test procedure originally developed to assist measuring and monitoring of diffusive migration of gases at radioactive waste disposal sites is presented. The adsorptive capacity of various soils for the tracer gases at various water contents was determined. Studies show the procedure is practical for volatile organic pollutants. Soil surface area available for adsorption. which is decreased by increasing water content, is of primary importance to amount of adsorption. A simple, reproducible procedure has been developed. 895060 Minimum test specimen mass for moisture content determination Howard, A K Geotech Test J VI2, NI. March 1989, P39-44 Minimum recommended test specimen masses for determining the moisture content of a homogeneous soil with uniformly distributed moisture are considered. Specimen mass is dependent on required accuracy, maximum particle size present and estimated moisture content. Equations to predict this mass are developed, and nominal values tabulated.
895061 Numerical and centrifuge modelling of coupled heat flow and consolidation around hot cylinders buried in clay Britto, A M; Savvidou, C: Maddocks, D V; Gunns, M J; Booker, J R Geotechnique V39, NI, March 1989, P13-25 Centrifuge tests were carried out to study heat transfer and conduction around heated model canisters in submerged beds of saturated kaolin clay. Temperature and pore pressure were monitored constantly. HOT CRISP, a 2-D coupled head transfer and consolidation analysis, was then used to model conditions in the centrifuge tests. The finite element program is described. Temperature and pore pressures calculated were compared with experimental values, showing reasonable correlation in normal consolidation if the Cam clay model was used, but poor correlation when a Gibson type elastic model was used. 895O62 Theory of thermal recovery from a spherically stimulated hot dry rook reservoir Elsworth, D J Geophys Res V94, NB2, Feb 1989, P1927-1934 A conceptual model is presented of thermal recovery from a HDR reservoir with a spherical permeable zone surrounded by impermeable host rocks. Variation in production temperature with time is influenced by reservoir throughput, thermal porosity, and ratio of reservoir diameter to depth. Only the first parameter significantly affects transient performance. Steady production temperature is dependent upon throughput and depth ratio. Boundary effects are insignificant for reservoir depths up to an order of magnitude greater than reservoir radius. Predictions agree well with field measurements. 895063 Relative density of geologically aged, British fine and finemedium sands Barton, M E; Palmer, S N Q J Engng Geol 1/22, NI. 1989, P49-58 In situ dry density of uncemented, virtually matrix free quartzose sands was determined gravimetrically on intact block samples and microscopically from impregnated thin sections. One method was used to determine minimum dry density and 3 methods to determine maximum dry density. Calculated relative density was compared with values available in the literature. Variations of relative density with in situ density and geological age are discussed. 895064 Effect of heating on some physical and chemical parameters related to soil aggregation and erndibility Giovannini, G; Lucchesi, S; Giachetti, M Soil Sci V146. N4. Oct 1988, P255-261 Controlled heating tests on a sandy loam and a silty clay are described. Up to 220 deg C, organic matter content, particle size distribution, and liquidity and plasticity were little affected. Above this, organic matter was burnt off and plasticity decreased. Aggregate stability increased steadily, despite removal of normal cementing agents, a new cementation process similar to laterisation being involved. Porosity decreased continuously for the sandy soil, but increased for the clay up to 460 deg C, when OH groups are lost from clay minerals. Relevance of results to agriculture and industry is discussed.
(' 1989 Pergamon Press plc. Reproduction not permitted
895061 Numerical and centrifuge modelling of coupled heat flow and consolidation around hot cylinders buried in clay Britto, A M; Savvidou, C: Maddocks, D V; Gunns, M J; Booker, J R Geotechnique V39, NI, March 1989, P13-25 Centrifuge tests were carried out to study heat transfer and conduction around heated model canisters in submerged beds of saturated kaolin clay. Temperature and pore pressure were monitored constantly. HOT CRISP, a 2-D coupled head transfer and consolidation analysis, was then used to model conditions in the centrifuge tests. The finite element program is described. Temperature and pore pressures calculated were compared with experimental values, showing reasonable correlation in normal consolidation if the Cam clay model was used, but poor correlation when a Gibson type elastic model was used. 895O62 Theory of thermal recovery from a spherically stimulated hot dry rook reservoir Elsworth, D J Geophys Res V94, NB2, Feb 1989, P1927-1934 A conceptual model is presented of thermal recovery from a HDR reservoir with a spherical permeable zone surrounded by impermeable host rocks. Variation in production temperature with time is influenced by reservoir throughput, thermal porosity, and ratio of reservoir diameter to depth. Only the first parameter significantly affects transient performance. Steady production temperature is dependent upon throughput and depth ratio. Boundary effects are insignificant for reservoir depths up to an order of magnitude greater than reservoir radius. Predictions agree well with field measurements. 895063 Relative density of geologically aged, British fine and finemedium sands Barton, M E; Palmer, S N Q J Engng Geol 1/22, NI. 1989, P49-58 In situ dry density of uncemented, virtually matrix free quartzose sands was determined gravimetrically on intact block samples and microscopically from impregnated thin sections. One method was used to determine minimum dry density and 3 methods to determine maximum dry density. Calculated relative density was compared with values available in the literature. Variations of relative density with in situ density and geological age are discussed. 895064 Effect of heating on some physical and chemical parameters related to soil aggregation and erndibility Giovannini, G; Lucchesi, S; Giachetti, M Soil Sci V146. N4. Oct 1988, P255-261 Controlled heating tests on a sandy loam and a silty clay are described. Up to 220 deg C, organic matter content, particle size distribution, and liquidity and plasticity were little affected. Above this, organic matter was burnt off and plasticity decreased. Aggregate stability increased steadily, despite removal of normal cementing agents, a new cementation process similar to laterisation being involved. Porosity decreased continuously for the sandy soil, but increased for the clay up to 460 deg C, when OH groups are lost from clay minerals. Relevance of results to agriculture and industry is discussed.
(' 1989 Pergamon Press plc. Reproduction not permitted