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| Development and application of a temperature-humidity controlled large triaxial apparatus for coarse granular materials |
| MAO Hangyu1，2，LIU Sihong1，2，SHEN Chaomin1，2，WANG Liujiang1，2，CHU Wenting1，2 |
| (1. College of Water Conservancy and Hydropower Engineering，Hohai University，Nanjing，Jiangsu 210098，China；2. International Joint Laboratory of Long-term Behaviour and Environmentally Friendly Rehabilitation Technologies on Dams，Hohai University，Nanjing，Jiangsu 210098，China) |
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Abstract To investigate the influence of the temperature and the relative humidity on the mechanical behaviour of coarse granular materials，a large-scale triaxial apparatus，which can accurately control the temperature and the relative humidity of coarse granular materials，was developed. Temperature control was achieved by controlling water temperature in the pressure chamber and relative humidity control was achieved by circulating water vapor in the sample. A set of methods for controlling the temperature and humidity of coarse granule materials in triaxial test were proposed，including the rapid relative humidity control method for coarse granular materials，the method to modify the external volume change measurement considering the influence of varying temperature and confining pressure，and the reliability detection method for sample temperature control. A series of triaxial shear and creep tests by controlling the temperature and the relative humidity were performed for phyllite coarse granular materials，meanwhile the internal mechanism of temperature and humidity effect on the mechanical properties of coarse granular materials was discussed. The results show that the new apparatus can accurately control the temperature and the relative humidity of coarse granular materials and that the increase of the temperature or the relative humidity would weaken the mechanical properties of coarse granular materials.
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2021, Vol. 40 
