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Tensile strength of frozen soil in the temperature range of the frozen fringe
| Title: | Tensile strength of frozen soil in the temperature range of the frozen fringe |
| Authors: | Akagawa, Satoshi Browse this author | | Nishisato, Kohei Browse this author |
| Keywords: | Tensile strength | | Frozen fringe | | Ice lens | | Frost heave | | Pore ice |
| Issue Date: | Jun-2009 |
| Publisher: | Elsevier B.V. |
| Journal Title: | Cold Regions Science and Technology |
| Volume: | 57 |
| Issue: | 1 |
| Start Page: | 13 |
| End Page: | 22 |
| Publisher DOI: | 10.1016/j.coldregions.2009.01.002 |
| Abstract: | Frost heaving is a discontinuous phenomenon. It starts from rupture in the partially frozen soil called the frozen fringe and then segregation of an ice lens follows in the rupture. Macroscopically, the above-mentioned cycle repeats consistently as soil freezes. The rupture of the frozen fringe should govern the initial conditions of ice lens growth; however, it has not been studied so far. In this paper, the rupture is studied assuming that it has a close relationship with the tensile strength of the frozen fringe. The compressive strength of frozen soil was well-studied in the last century. However, the tensile strength of frozen soil in frozen fringe temperature range, i.e. 0 to -2 ℃, has not yet been explored. Disturbed, reconsolidated, and frozen diluvial silt called Dotan in Japan was used as the test specimen. A newly developed tensile test apparatus was used. Fifteen tensile tests were conducted in the temperature range of +0.6 to -1.31 ℃. A steep rise in the tensile strength in the frozen fringe temperature range was observed, being 20 to 70 times higher than that in the unfrozen state. A mechanism of explaining the steep rise in tensile strength is discussed along with the unfrozen water content of Dotan and ice tensile strength, and a simplified soil structure model. The tensile strength of the frozen fringe seems to be primarily due to the tensile strength of the pore ice framework. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/38593 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 赤川 敏
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