Author(s): Artem Nesterov; Aleksey Marchenko; Nicolai Vasiliev
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Abstract: Construction and operation of port, transport, residential and other large coastal facilities in Arctic region are complicated by spreading of frozen soils. With a natural change in temperature, compression (expansion) deformations of frozen soils arise. As a result of the action of frost heaving forces, destruction of engineering structures (retaining walls, pile-shells with soil aggregate, dams, pipelines, embankments etc. ) can occur. The laboratory experiments were performed in the cold laboratory of the University Centre in Svalbard at November 2019 to investigate thermal response of clay samples due to cyclic changes of the room temperature from -5 to -20⁰C and due to the freezing of water in the soil cracks. Both fresh and sea water were used. Clay samples were made by hand with pre-prepared cracks, and the chain saw was used to repeat experiments with freezing water. The horizontal dimension of clay samples was of about 50х35 cm, and the thickness was of about 14 cm. Fiber optics sensors AOS GmbH were used to measure clay strains and temperature in the laboratory. MicroSHM System MISTRAS was used to register acoustic emission in the tests. For comparison results experiments with fresh and sea ice samples were conducted. Test on ice were carried out in 2018-2019 independently of the clay tests. The results of measuring deformations of frozen soils according to the proposed methodology can reveal the mechanism of stress-strain state formation for such soils in a wide range of thermal and mechanical loads and the time of their impact. The results can be used for estimating stability of harbor and coastal engineering structures.
Year: 2020