Development of an Effective Slope Protection Work in a Cold Region. (II). Case Study on the Development of Frost Heave Check Grids and Their Field Test.

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  • 寒冷地における法面保護工の開発　（ＩＩ）　　凍上抑制法枠の開発と現地試験
  • カンレイチ ニ オケル ノリメン ホゴコウ ノ カイハツ 2 トウジョウ ヨクセイ ノリワク ノ カイハツ ト ゲンチ シケン
  • Case Study on the Development of Frost Heave Check Grids and Their Field Test
  • 凍上抑制法枠の開発と現地試験

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In order to investigate the effects of the frost heave check grids recently applied for the development of effective slope protection works in cold regions, a field test was conducted over 3 consecutive winters in the eastern part of Hokkaido. The basic cross-section of the frost heave check grids applied has such a structure that a reaction plate is attached to the bottom of a generally used conventional I-shape grid so as to entirely form an upside-down “T.” These frost heave check grids and the conventional grids were made of timber, concrete, and iron, respectively, and were tested in the field. After the field test done over three consecutive winters, it became clear that the frost heave check slope grids heaved or protruded little from the ground surface of the slope so that they were more effective in preventing frost damage to the slope than the conventional slope grids which actually heaved or protruded from the ground surface of the slope. In particular, the timbered frost heave check slope grids were remarkably superior in the frost heave check effect over the conventional timbered slope grids. Further, the phenomenon where a slope grid 15 cm high started to generate frost heave when the frost depth reached 7 to 8 cm suggests that the frost heave of the grids which induces frost damages to the slope was mainly brought about by the seasonal freeze-thaw cycle rather than the daily freeze-thaw cycles repeated within a frost depth ranging from 0 to 5 cm. Based on discussions of the results of the field tests obtained so far, we have concluded that an effective slope protection work in a cold region can be achieved by using the frost heave check slope grids to stabilize the planting ground on the slope and by planting the native dwarf bamboo in fine grained frost-susceptible soil suitable for the growth of the dwarf bamboo. As a result, the slope is expected to be covered with dwarf bamboo as seen in natural slopes within several years after completion of the planting and construction so that frost damage to the slope can be checked.

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