Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Pore water pressure at an ice lens: Its measurement and interpretation
AbstractOne dimensional freezing tests with fixed temperature boundary conditions and an applied back-pressure to the pore water were carried out on Devon silt in order to determine the pore pressure at an ice lens. It was established that tests with an applied back-pressure result in the same freezing characteristics as conventional tests. During closed-system freezing, the pore pressure dropped continuously and reached an ultimate value which is related to the temperature at the base of the warmest ice lens at thermal steady state. For a given soil, the temperature is dependent upon the amount of cooling produced by the removal of heat released at the ice lens by the migratory water, and upon the amount of warming resulting from the vertical settlement of the base of the ice lens caused by the consolidation of the unfrozen soil. For Devon silt under zero applied load, the maximum drop in pore pressure varied between 210 and 258 kPa. According to the Clapeyron equation, the temperatures at the ice lens inferred from the pore pressure measurements varied then between -0.17 and -0.21°C. Comparison with temperature data obtained from conventional tests associated with the X-ray photography technique suggests that the temperature inferred from the change in pore pressure is somewhere between the temperature of ice lens formation and the lowest temperature at which the same ice lens can grow for a rate of cooling of the frozen fringe smaller than 0.1°C/day.
Pore water pressure at an ice lens: Its measurement and interpretation
AbstractOne dimensional freezing tests with fixed temperature boundary conditions and an applied back-pressure to the pore water were carried out on Devon silt in order to determine the pore pressure at an ice lens. It was established that tests with an applied back-pressure result in the same freezing characteristics as conventional tests. During closed-system freezing, the pore pressure dropped continuously and reached an ultimate value which is related to the temperature at the base of the warmest ice lens at thermal steady state. For a given soil, the temperature is dependent upon the amount of cooling produced by the removal of heat released at the ice lens by the migratory water, and upon the amount of warming resulting from the vertical settlement of the base of the ice lens caused by the consolidation of the unfrozen soil. For Devon silt under zero applied load, the maximum drop in pore pressure varied between 210 and 258 kPa. According to the Clapeyron equation, the temperatures at the ice lens inferred from the pore pressure measurements varied then between -0.17 and -0.21°C. Comparison with temperature data obtained from conventional tests associated with the X-ray photography technique suggests that the temperature inferred from the change in pore pressure is somewhere between the temperature of ice lens formation and the lowest temperature at which the same ice lens can grow for a rate of cooling of the frozen fringe smaller than 0.1°C/day.
Pore water pressure at an ice lens: Its measurement and interpretation
Konrad, J.-M. (Autor:in)
Cold Regions, Science and Technology ; 16 ; 63-74
15.07.1988
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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