Topic
Frost crack
About: Frost crack is a research topic. Over the lifetime, 45 publications have been published within this topic receiving 158 citations.
Papers
TL;DR: In this article, the authors described three sites in the central Wielkopolska region (central-west Poland) in two main positions: (1) within fluvioglacial deposits below the Weichselian subglacial till and (2) within recessional deposits above this sub-glacial until.
Abstract: Wedge-shaped structures are described from three sites in the central Wielkopolska region (central-west Poland) in two main positions: (1) within fluvioglacial deposits below the Weichselian subglacial till and (2) within recessional deposits above this subglacial till. The wedges are interpreted as ice-wedge pseudomorphs (Rensko site), relict frost cracks (Tomice site) and thermokarst-affected ice-wedge pseudomorphs (Annowo-Kiszkowo area). The pseudomorphs suggest that thermal-contraction cracking occurred in the region in front of the advancing Weichselian ice sheet, as well as following its recession. Frost structures, which are interpreted as having degraded slowly, were much more affected by thermokarst processes (Annowo-Kiszkowo area) than those in the Rensko and Tomice sites which probably thawed rapidly, due to an insulating and warming effect of the overlying ice masses. The development of ice wedges was influenced by wet conditions in former depressions between ice-cored ridges or by large amounts of meltwater in the proglacial environment. These periglacial features support previous hypotheses that climatic conditions in the Wielkopolska region after the last ice-sheet recession changed gradually from glacial to periglacial. Copyright © 2009 John Wiley & Sons, Ltd.
28 citations
TL;DR: In this article, field observations in the Mackenzie Delta area largely substantiate Lachenbruch's theoretical considerations of thermal contraction crack development, showing that individual polygons, where developed, ranged in size from 20 to 30 metres diameter on bare surfaces to 2 to 3 metres on sedge-covered areas, and 80% of the angular intersections were of orthogonal type.
Abstract: Field observations in the Mackenzie Delta area largely substantiate Lachenbruch's theoretical considerations of thermal contraction crack development. Frost crack patterns, representing the incipient stage of tundra polygons, were observed on both bare and vegetated surfaces of low alluvial flats and sandspits of three islands. Individual polygons, where developed, ranged in size from 20 to 30 metres diameter on bare surfaces to 2 to 3 metres on sedge-covered areas, and 80% of the angular intersections measured were of orthogonal type. Most cracks exhibited random orientations, except in close proximity to water bodies where tendencies toward normal and subparallel orientations occurred.
25 citations
TL;DR: In this article, ground thermal conditions in a frost-crack polygon, a palsa and a mineral palsa (lithalsa) in the discontinuous permafrost zone, northern Sweden
Abstract: Ground thermal conditions in a frost-crack polygon, a palsa and a mineral palsa (lithalsa) in the discontinuous permafrost zone, northern Sweden
13 citations
TL;DR: In this paper, the principal parameters of primary frost cracks are calculated and an analysis of their dependence on mechanical and thermophysical soil properties and baseline data is presented, and an analytical estimate of the temperature field and thermo-elastic stresses occurring in the near-surface layer as a result of sudden atmospheric cooling is provided.
Abstract: An idea of B.N. Dostovalov’s to represent a mass of frozen soil, prior to its failure, as an elastic brittle body is considered. An analytical estimate is provided of the temperature field and thermoelastic stresses occurring in the near-surface layer as a result of sudden atmospheric cooling. The principal parameters of primary frost cracks are calculated. An analysis is presented of their dependence on mechanical and thermophysical soil properties and baseline data.
9 citations
Patent•
16 Dec 1992
TL;DR: In this paper, the utility model relates to a valve for preventing a water pipe from frost crack, where the diameter of the ice cavity pipe is smaller than that of the water flow main pipe, and an expansive force is generated to push a valve shaft on the side of the pipe.
Abstract: The utility model relates to a valve for preventing a water pipe from frost crack A water flow main pipe (1) is installed in a water channel so that water flows into an ice cavity pipe (11) The utility model is characterized in that the diameter of the ice cavity pipe is smaller than the diameter of the water flow main pipe so that water in the ice cavity pipe ice up first when frost occurs, and an expansive force is generated to push a valve shaft (9) which is arranged on the side of the ice cavity pipe; consequently, a valve sheet (5) is opened, and a little water passing through the ice cavity pipe flows out of the valve through a water outlet (8); water flows into the water channel continuously, which prevents the frost of the inner part of the water pipe After defrosting, the expansive force of ice disappears, the valve sheet is closed, and water does not flow out In many areas of China, water pipe insulation is necessary in despite of a short frost time, but with the adoption of the utility model, convenience and durability are provided for the areas
8 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2020 | 3 |
| 2019 | 2 |
| 2018 | 6 |
| 2017 | 2 |
| 2016 | 4 |
| 2015 | 4 |