Abstract
This study investigated the one-dimensional thermo-mechanical behaviour of three types of peat with different natural water contents, under a variety of thermo-mechanical loading paths to establish a rational phenomenological interpretation of their responses. The results from temperature-controlled incremental loading (IL) and constant-rate-of-strain (CRS) and consolidation test 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 isotach concept. The test results show that λα* is only slightly dependent on temperature.
Published Version
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