Abstract
This study focuses on the effects of temperature on the consolidation property and consistency of clay for thermal improvement of soft clay ground. Although it is already known that an increase in temperature can accelerate consolidation of clay, the degree of the temperature effect has not yet been generalized between various clays. In this study, a series of one-dimensional consolidation tests at different temperatures (17, 23, 35, 50, and 65°C) using 2 processed clays and 3 natural clayey soils dredged at ports are presented. To evaluate the temperature effect on soil consistency, which might affect the consolidation behavior, atterberg limits of the clays were also evaluated at different temperatures. As a result, it was confirmed that, although the temperature effect on consistency limits varies depending on the type of clay, the consolidation coefficient increases with increase in temperature in all the clay soils tested.
Highlights
In recent years, it has been pointed out that the ground temperature in urban areas has been rising due to the effects of global warming, the exhaustion of heat from underground structures, and the introduction of underground heat pump systems
We found no significant changes in plastic limits with changes in temperature for any of the clays, a finding consistent with the results of existing studies
Since the effect of temperature change on the volume of soil particles and pore water should be similar for any soils, the factors resulting in the change in liquid limits for Tokuyama Port clay and Osaka Bay with
Summary
It has been pointed out that the ground temperature in urban areas has been rising due to the effects of global warming, the exhaustion of heat from underground structures, and the introduction of underground heat pump systems. In Japan, it has been said that the temperature in the ground at a depth deeper than 10 m is stable at around 15°C to 20°C throughout the year. For this reason, the effects of underground temperature changes on the ground have not been fully studied. If the temperature dependence of consolidation can be generalized, it can be used for the consolidation acceleration method and for ground deformation prediction during underground heat storage, which is very important for promoting the use of geothermal heat. The temperature dependence of soil consistency and consolidation was confirmed by performing laboratory experiments at various temperatures using various types of clay, and the relationship between the two was evaluated
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