Primary and secondary consolidation compression for saturated soil considering coupling effect of loading and heating

Abstract

Geotechnical engineering that relates to the energy and environmental problem is receiving more and more attention worldwide. It is of great theoretical and practical value to study the properties of soil under thermal mechanical coupling and its mathematical description. Firstly, based on the general function, a unified primary and secondary consolidation model of saturated soil considering heating temperature is deduced. Combining the existing research achievements, a practical model is obtained which comprehensively reflects the effective stress change, creep and heating effects. After that, a series of thermo-consolidation tests are carried out using a temperature controlled consolidation instrument to study the effects of effective stress, temperature and consolidation duration on saturated soils. The corresponding functional formulas and parameters are obtained thusly. On this basis, the calculation and analysis are carried out to check the reliability and applicability of the newly proposed model. The new model is simple and practical and the parameters are easy to be obtained. And it describes the main law of consolidation compression of saturated soils under the thermal mechanical coupling effect. Therefore, it is suggested for theoretical analysis of thermal geotechnical engineering problems.

Keywords

soft soil / primary consolidation / secondary consolidation / temperature effect / consolidation compression test

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