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STRESS–STRAIN BEHAVIOUR OF A CLAYEY SILT IN TRIAXIAL TESTS
Session: Soil Mechanics I / Mécanique des sols I
Rajith Dayarathne, Memorial University (Canada)
Bipul Hawlader, Memorial University (Canada)
Frost heave is one the major issues in the design of pipelines in cold regions. The pipelines generally traverse through a variety of soils. Among the different types of soil, clayey silt has been identified as one of the highly frost susceptible soils. In the analyses of pipeline–soil interaction due to frost heave, the stress–strain behaviour of both unfrozen and unfrozen soil is equally important. In the current research program, centrifuge physical modeling and finite element analysis will be performed to examine the effects of frost heave on chilled gas pipelines. While a large number of laboratory test results on different sands and clays are available in the literature, laboratory tests on clayey silt, which is highly frost susceptible, are very limited. In this paper, some triaxial and consolidation test results on clayey silt are presented, which could be used to understand its constitutive behaviour. The soil used in this experimental program is same as the soil used for centrifuge physical modeling. Comparing test results with typical behaviour of sand and clay in the critical state framework, some similarity and differences are highlighted.
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