The effect of temperature on shear characteristics of interface between sand and concrete considering the fine-grained soil content

In the process of heat conduction between thermo-active ground structures and the ground, the change of the temperature field will lead to the change of the soil stress field and the change of mechanical properties of soil and soil-structure interface. Based on the quadruple shear strain-controlled...

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Bibliographic Details
Published in:Arabian journal of geosciences 2022, Vol.15 (10), Article 986
Main Authors: Pan, Weidong, Jiang, Hao, Chen, Jian
Format: Article
Language:English
Subjects:
Concrete
Conduction heating
Conductive heat transfer
Earth and Environmental Science
Earth science
Earth Sciences
Fine-grained soils
Friction
Heat conduction
Interfacial friction angle
Interfacial shear strength
Interfacial shear stresses
Internal friction
Mechanical properties
Original Paper
Sand
Shear strain
Shear strength
Shear stress
Shear tests
Soil
Soil investigations
Soil mechanics
Soil properties
Soil stresses
Soil temperature
Soil-structure interaction
Stress distribution
Temperature distribution
Temperature effects
Temperature fields
Unsaturated soils
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Summary:In the process of heat conduction between thermo-active ground structures and the ground, the change of the temperature field will lead to the change of the soil stress field and the change of mechanical properties of soil and soil-structure interface. Based on the quadruple shear strain-controlled direct shear apparatus, a temperature-controlled system was added and converted into a temperature-controlled direct shear apparatus. A series of temperature-controlled interface direct shear tests were carried out between sand and concrete with different contents of fine-grained soil to investigate the effect of the fine-grained soil content and temperature on the interface shear strength parameters. Based on the shear strength theory of unsaturated soil, the interface friction mechanism was summarized, and the micro mechanism of temperature effect of the interface shear characteristics was analyzed. It is found that the temperature has little effect on the type of the interface shear stress versus shear displacement curve ( τ-l curve), but has a slight effect on the peak point. When the content of fine-grained soil β ≤11%, the interface shear strength index first decreases and then increases with the increase of temperature, and the minimum value appears at the temperature of 40°C ( T =40°C). The interface shear strength indexes all increase with the increase of temperature when β >11%. With the increase of the fine-grained soil content, the interface internal friction angle is negatively correlated, and the interface cohesion force is positively correlated.
ISSN:1866-7511
1866-7538
DOI:10.1007/s12517-022-10235-x