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Frost heave characteristics of a clayey silt subjected to small temperature gradients
AbstractA frost heave test on a 68.5-cm high soil column composed of a 23.5-cm saturated sand layer adjacent to the cold plate, overlain by about 45.0-cm of Calgary silty clay instrumented with embedded heave gauges is described. The silty clay frost susceptible soil was reconstituted as a normally consolidated soil and frozen with free access to an external water source. The freezing test revealed that consolidation of the unfrozen soil in response to effective stress increase caused by the freezing-induced suction is an important factor to consider in the analysis of frost heave in compressible soils. Surface heave was about one-half of the heave recorded by the embedded heave/thermistor gauges. Segregation potential inferred from surface heave measurements may thus not be representative values for field frost heave predictions. The results lend support to the concept of segregation potential even for extremely small temperature gradients, at least for temperature gradients as small as 4°C/m.
Frost heave characteristics of a clayey silt subjected to small temperature gradients
AbstractA frost heave test on a 68.5-cm high soil column composed of a 23.5-cm saturated sand layer adjacent to the cold plate, overlain by about 45.0-cm of Calgary silty clay instrumented with embedded heave gauges is described. The silty clay frost susceptible soil was reconstituted as a normally consolidated soil and frozen with free access to an external water source. The freezing test revealed that consolidation of the unfrozen soil in response to effective stress increase caused by the freezing-induced suction is an important factor to consider in the analysis of frost heave in compressible soils. Surface heave was about one-half of the heave recorded by the embedded heave/thermistor gauges. Segregation potential inferred from surface heave measurements may thus not be representative values for field frost heave predictions. The results lend support to the concept of segregation potential even for extremely small temperature gradients, at least for temperature gradients as small as 4°C/m.
Frost heave characteristics of a clayey silt subjected to small temperature gradients
Konrad, J.-M. (author) / Nixon, J.F. (author)
Cold Regions, Science and Technology ; 22 ; 299-310
1993-08-27
12 pages
Article (Journal)
Electronic Resource
English
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