Abstract
Depending on increase in the number and type of energy geostructures, studies on the change in soil behavior against heat increase becomes more important. The engineering properties such as permeability, volume deformation of surrounding soils around energy structures mustn’t alter in the presence of heat and thermal cycles. Pumice is a material used in many fields especially for thermal insulation. For that reason, pumice can be used for increasing the resistance of soils in the presence of heat. In this study, the shear strength behavior of sand-bentonite mixtures was investigated with pumice additive under high temperature. In the experiments, 10% and 20% pumice were added to 10% and 20% sand-bentonite mixtures and compaction, direct shear tests were conducted. The direct shear tests were performed both room temperature and under 80°C. The results have shown that the pumice additive increased the shear strength of sand-bentonite mixtures under high temperature when compared the test results under room temperature.
Highlights
The increase in the number of energy geostructures increased the importance of interaction between the soil and energy structure and soil behavior under high temperatures
At 80oC, the internal friction angle increased from 32.2o to 33.8o with 10% pumice and 35.1o with 20% pumice by showing a significant trend as pumice was added to the 10B-90S mixtures. These findings indicate that pumice additive has an effect on increasing the internal friction angle of 10% bentonite-sand mixtures under high temperature
Direct shear tests were conducted on the pumice added 10% and 20% bentonite-sand mixtures under room temperature and high temperature
Summary
The increase in the number of energy geostructures increased the importance of interaction between the soil and energy structure and soil behavior under high temperatures. Today use of many structures or elements such as energy piles, buried power cables, solid waste and nuclear waste storage areas, etc., which cause soils to be exposed to high temperatures. The behavior of soils in the presence of temperature varies in many respects. The shear strength of the normally consolidated clay increases with increasing soil temperature. The studies have shown that the slope of the shear strength envelope is independent of the temperature [1]. It was found that the effect of temperature on shear strength is significantly dependent on volume changes caused by heating called thermal consolidation [2]. The triaxial compression tests on Pontida silty clay showed that in the temperature range of 18°C to 115°C, the shear strength and hardness of this silty clay decreased with increasing temperature [3]
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