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寒冷地の切土のり面に設置された小段排水溝では古くから凍上被害が報告されているこれまでの研究でも様々な対策が検討されてきたが今後広く普及することが期待できる決定的な凍上対策工法は現時点では存在していないそこで本研究ではポリプロピレン製で高強度と柔軟性を併せ持つ立体網状スパイラル構造の排水材を用いて小段排水溝を作製することを試みたこの段排水溝を実際に試験施工し地中温度や排水溝の変位といった様々な項目の計測を2年間実施したその結果本研究で開発した小段排水溝は地盤の凍上・融解沈下挙動に追従して変形することができ凍上によって損傷しないことが確認されたまた簡易通水性能試験を実施し2年経過後においても排水材が通水性能を保持していることを確認したIn this research, we have tried to make a berm ditch using a polypropylene drainage material that has a threedimensional mesh and spiral structure featuring both high strength and flexibility. We have actually constructed the ditch and made various measurements, such as soil temperatures and ditch displacement, over two years. From the results, we have confirmed that the berm ditch developed in this research is not damaged by frost heave since it is able to follow the frost heave and thaw settlement of the ground. In addition, we have conducted a simple transmissivity test and found that the material maintains its water transmissivity performance after two years

APPLICATION OF FROST HEAVE RESISTANT DRAINAGE MATERIAL WITH THREE-DIMENSIONAL MESH AND SPIRAL STRUCTURE TO BERM DITCHES