Thermo-mechanical behaviour of peats under one-dimensional compression

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Abstract
In this study, the one-dimensional thermo-mechanical behaviour of three types of peat with different natural water contents was investigated, under a variety of thermo-mechanical loading paths, to establish a rational phenomenological interpretation of their responses. The results from temperature-controlled incremental loading and constant-rate-of-strain and consolidation tests suggest that a unique effective stress–volumetric strain relationship exists at a given set of viscoplastic strain rate and temperature, or ‘isothermal isotaches’ exist. The coefficient of thermo-plastic compression and the coefficient of secondary consolidation were jointly adopted to describe the simultaneous temperature and strain-rate dependency of peats. Their ratios to the compression index are largely unique regardless of the type of peats. The test results indicate that testing peats in a laboratory (20–25°C) can lead to an underestimation of the in situ (∼10°C) yield stress by about 30%. The potential temperature dependency of the coefficient of secondary consolidation, λα*, was reappraised by redefining the coefficient within the framework of the isotache concept. The test results show that λα* is only slightly dependent on temperature.
Funding Information
  • JST SPRING (JPMJSP2119)

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