Behaviour Of Experimental Permafrost Submitted To Warming Conditions: Lithology Ice Content Impact

摘要

This work contributes to the development of new experimental techniques applied to permafrost. It also contributes to the enrichment of databases related to physical modeling on permafrost. According to our results it is already possible to identify some major trends (Fig. 1): (1) for poor ice-rich permafrost (<50% ice-content) thaw-settlement is higher for a sandy sediment (A1); (2) for a loess-dominated permafrost, thaw-settlement increases with the percentage of ice (A1); (3) for a sandy sediment, thaw-settlement is not dependent on ice-content (A1); (4) for a loess-dominated permafrost, the thickness of the active layer is not dependent on the percentage of ice (A2); (5) for a sandy sediment, the thickness of the active layer seems anti-correlated with the ice-content (for ice-content > 50%, A2); (6) the thaw-settlement increases strongly when a massive ice-layer starts to melt (B1); (7) the presence of a massive ice-layer in sub-surface slightly decreases the thickness of the active layer (B2). This point can be correlated with the amount of heat needed to melt the massive ice-layer.