通過車両の影響を考慮した凍結防止剤事後散布後の路面すべり抵抗推定法の構築と検証

Abstract

A method of estimating the post-salting road surface skid resistance considering salt scattered by the passage of vehicles on the road ice film (simplified prediction method) was developed in this study. In order to develop this method, a numerical model was developed to calculate the amount of de-icing salt that is scattered beyond the roadway due to the passage of vehicles. And then, the ratio of scattered salt to spread salt was evaluated by simulations based on the numerical model. Moreover, the relation between the road ice film thickness and HFN was clarified by field tests. Additionally, the simplified prediction method was verified through comparison between estimated HFN and measured HFN. It became possible to estimate the post-salting HFN for a road ice film considering the influence of vehicle passage. 本研究では，通過車両による凍結防止剤の飛散を考慮した凍結防止剤事後散布後の路面すべり抵抗値推定法(HFN簡易推定法)を構築した．HFN簡易推定法の構築のために，通過車両による凍結防止剤の飛散を計算する数値解析モデルを構築し，数値シミュレーションを通じて凍結防止剤の散布量に対する通過車両による飛散量の比を定量的に評価した．また，野外走行試験からHFNと平均氷膜厚の関係を明らかにした．さらに，野外走行試験との比較からHFN簡易推定法の妥当性を検証した． 本研究により，通過車両を考慮して凍結防止剤事後散布後のHFNの推定が可能になった．