thaw settlement
Link: http://w3id.org/permafrost/v/ipaglossary/t0345
Within: IPA Permafrost Glossary
Definition: Compression of the ground due to thaw consolidation (see Figure 7).
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thaw settlement
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tassement dû au dégel fr |
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| Comment |
In coarse-grained and dense soils, the amount of thaw settlement is usually small because it is governed mainly by the melting of pore ice. In ice-rich permafrost, and seasonally frozen ground containing excess ice, however, the amount of thaw settlement may be quite substantial. In general, on thawing, any frozen ground will settle both under its own weight and under applied stresses. The settlement will continue as long as the thawing front advances and until the pore pressures generated during thawing are dissipated. In relatively permeable coarse-grained soils, where draining of pore water is rapid, the thaw settlement rate will usually follow closely the rate of thaw, and development of pore pressures will be negligible during the thaw period. On the other hand, if a relatively impermeable fine-grained soil is thawed rapidly, then excess pore pressures will be generated. If these excess pore pressures are sustained for any length of time, then severe problems may develop (e.g., slopes may become unstable, dam foundations may fail, and differential settlements may be aggravated).
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| dcterms:source |
https://doi.org/10.4224/20386561
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