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| Coupled model for one-dimensional nonlinear consolidation and#br#
heat conduction in saturated clay |
| JIANG Wenhao1，2，3，FENG Chen1，2，3，LI Jiangshan1，3 |
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Science，Wuhan，Hubei 430071，China；2. University of Chinese Academy of Sciences，Beijing 100049，China；3. Hubei Province Key Laboratory of Contaminated Sludge and Soil Science and Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Science，Wuhan，Hubei 430071，China)
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Abstract To investigate the coupled problem of one-dimensional nonlinear consolidation and heat conduction in saturated clay，the governing equations for nonlinear consolidation and heat conduction are derived considering the effects of temperature change on the physical and mechanical properties of clay，and a corresponding coupled model is established. This model can consider the interaction between nonlinear consolidation process and heat conduction process. Later，the finite difference method is adopted to solve the proposed coupled model，and the rationality of the model is effectively verified by comparing it with the calculation results of COMSOL software and other analytical solutions. Based on the presented coupled model，an example is used to analyze the influences of temperature increment ΔT，pre-consolidation pressure pcR and linear loading time ta on the consolidation behaviors. The results show that the temperature change has comprehensive effects on the nonlinear consolidation process，the increase of ΔT generally accelerates the dissipation rate of excess pore-water pressure，and also increases the settlement rate and final settlement. The dissipation rate of excess pore-water pressure in saturated clay increases with an increasing pcR，while the settlement decreases with an increasing pcR. The increase of ta reduces the maximum excess pore-water pressure generated in saturated clay，and also slows down the consolidation rate. In addition，it is observed that the consolidation degree Us defined by settlement is less than the consolidation degree Up defined by pore pressure during the consolidation process.
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2023, Vol. 42 
