Abstract
With climate change, permafrost under marshes in permafrost degradation areas thaws gradually, and the strength of permafrost decreases sharply, which seriously threatens the safety and stability of the structures on the surface. Based on the widening project of an old road in the permafrost degraded area of Northeast China, the changes of three fields of hydraulic, thermal, and mechanical at the research location are analyzed and predicted by establishing a simulation model. Taking the stress-temperature coupling damage model as the constitutive model, based on Biot porous medium theory and convective heat transfer equation. The thermohydromechanical coupling model of warm frozen soil is established to describe the thawing and consolidation process of warm permafrost with strength attenuation. The reliability of model calculation results and the scientificity of engineering treatment measures are analyzed and verified by field data collection. The results show that when the permafrost layer is not penetrated, the temperature field of surrounding soil will not be disturbed by normal temperature gravel pile group. However, the thawing process of permafrost is accelerated, the dissipation speed of excess pore water pressure caused by construction loading and thawing of permafrost is improved, the subgrade deformation caused by thawing and consolidation of permafrost is effectively reduced, and the stability of the subgrade during construction and road operation is ensured.
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We thank the reviewers for their many suggestions related to this paper.
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This study was financially supported by the National Natural Science Foundation of China (41641024).
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Wei, S., Tao, Y., Ying, G. et al. Thermohydromechanical coupling analysis and engineering verification of gravel pile groups for strengthening permafrost marshland highway foundations. Bull Eng Geol Environ 81, 294 (2022). https://doi.org/10.1007/s10064-022-02796-8
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DOI: https://doi.org/10.1007/s10064-022-02796-8