Permanent Effects of Elevated Temperature on the Hydraulics and Strength Properties of Clay Confining Layers in Aquifer Storage of Thermal Energy

摘要

An investigation of the permanent effects of temperature on the physical and engineering properties of Georgia kaolinite, Urbana illite, and bentonite soils, was carried out to gain information about their use as clay seals for the storage of heated water in subsurface aquifers. Samples of the soils were consolidated from a slurry and treated at temperatures of 20, 90 and 160 degrees C for twelve hours after which they were subjected to analysis by a constant rate of strain consolidometer. Hydraulic conductivity, volume compressibility, and the coefficient of consolidation were measured and the data were tested for linear and quadratic temperature effects.