PREVENTING MEASURE OF FROST HEAVING DAMAGE ON SMALL SIZED U-TROUGH USING GRAVEL BACKFILL

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  • 裏込め砂利による小型U-トラフの凍上破壊対策
  • ウラゴメ ジャリ ニ ヨル コガタ U-トラフ ノ トウジョウ ハカイ タイサ

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Concrete U-trough used as road gutter is often damaged by frost heaving pressure during the winter season. In this study, 450 milimeter ready made concrete U-trough specified in JISA 5305 were experimentally set under the following conditions. 1) backfilled with in situ soil (no countermeasure). 2) backfilled with gravel having thickness of 15, 30, 40 50 centimeter. The frost heaving pressure, deformation, and so on arise at these troughs were measured. The main results of these field tests were as follows.<br>1) The effect of gravel backfill for reducing frost heaving pressure was evidentry recognized.<br>2) In the tested condotions used in this study, there existed a backfill thickness at which the frost heaving pressure acting on the side wall of trough had a minimum value.<br>3) Under the certain conditions, the optimum thickness of gravel backfill for reducing frost heaving pressure could be determined reasonably.

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