首页|Pot-cover effect in permafrost embankment: Laboratory experimental reproduction and prevention measures simulation
Pot-cover effect in permafrost embankment: Laboratory experimental reproduction and prevention measures simulation
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NETL
NSTL
Elsevier
Under the influence of large temperature differences in permafrost regions, liquid water and vapor in the soil accumulate at the bottom of the impermeable layer, forming a pot-cover effect. The phenomenon leads to increased embankment filler porosity, reduces bearing capacity, and exacerbated frost heave and thaw settlement issues. However, the pot-cover effect in embankment in permafrost regions has not yet been verified. This study conducted hydro-thermal transfer experiments using a moisture migration tester and combined numerical simulations to study the migration and accumulation processes of moisture within embankment in permafrost regions, aiming to verify the existence of the pot-cover effect in embankments. Furthermore, based on the watervapor-heat coupling model, this study explores prevention measures for the pot-cover effect through numerical simulation. The results indicate that: (1) the volumetric liquid water content within the soil sample depth range of 0 cm to 30 cm increased by 2.2 % to 4.9 %, confirming the presence of the pot-cover effect in permafrost regions. (2) both liquid water and vapor migrate upwards during the freezing period and downwards during the thawing period. The vapor flux exceeds that of liquid water during freezing, indicating that the moisture accumulation is mainly related to the vapor migration within the soil. (3) when an impermeable layer is placed at a depth of 0.5 m in embankment, the average volumetric liquid water content between 2.5 m and 0.5 m is 15.1 %, closely matching the initial value of 15 %. Thus, installing an impermeable layer at 0.5 m effectively mitigates the pot-cover effect in embankments
NETL
NSTL
Elsevier
