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单词 Atterberg limits
释义
Atterberg limits

Geology and Earth Sciences
  • Series of thresholds which are observed when the water content of a soil is steadily changed. The ‘contraction limit’ occurs when sufficient water is added to a dry soil for contraction cracks to close. The addition of further water leads to plastic deformation at the ‘plastic limit’. The ‘liquid limit’ occurs when just enough water is then added for the soil to behave like a liquid. Knowledge of these limits is important for understanding and predicting hillslope failure. The difference in percentage water content between the liquid limit and the plastic limit is called the ‘plasticity index’. The limits were described by the Swedish soil scientist Albert Mauritz Atterberg (1846–1916).


Geography
  • Limits used to classify soils. The liquid limit is the minimum moisture content at which the soil can flow under its own weight; the plastic limit is the minimum moisture content at which the soil can be rolled into a 3 mm diameter thread without breaking; the shrinkage limit is the moisture content at which further water loss will not cause further shrinkage. See Fener et al. (2005) Cana. Geotech. J. on the Atterberg limits of cohesive soils.


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