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Dahu Rui
Chinese Academy of Sciences
GeologyFrost lineGeotechnical engineeringFrost (temperature)Frost heaving
7Publications
2H-index
6Citations
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Publications 9
Newest
#1Dahu Rui (CAS: Chinese Academy of Sciences)H-Index: 2
#1Dahu RuiH-Index: 1
Last. Yuzuru ItoH-Index: 1
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Abstract Heavy metal contaminants in clay soils can be removed through freeze–thaw cycles and washing, but the removal efficiency is low. In this study, the cause of low remediation efficiency was analyzed through the influence of eluent concentration and replenishment sequence on the frost heave of soil in combination with one-dimensional freezing soil column experiments. Results showed that the viscosity coefficient of 0.15 mol/L ethylene diamine tetraacetic acid (EDTA) increased by approximat...
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#1Dahu Rui (CAS: Chinese Academy of Sciences)H-Index: 2
Last. Teruyuki Suzuki (Kitami Institute of Technology)H-Index: 5
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Abstract During soil frost heave, the hydrothermal effect directly causes many engineering freezing damage problems. To reveal the mechanism of hydrothermal interaction, the dynamic observation of hydrothermal state, frost heave, and freezing depth was conducted in the field for 1 year. Results showed that, the temperature gradient changes rapidly and the freezing rate is slow, moisture can have sufficient time to migrate to the freezing front and produce enhanced frost heave. The reduction of l...
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#1Dahu Rui (CAS: Chinese Academy of Sciences)H-Index: 2
Last. Teruyuki Suzuki (Kitami Institute of Technology)H-Index: 5
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Abstract Freeze–thaw is the major factor in gravitational erosion creep of slopes in cold regions, but gravitational erosion is influenced remarkably by vegetation cover. In order to investigate the phenomenon of the gravitational erosion process of vegetation slopes under freeze–thaw in seasonally frozen soil regions, on-site freeze–thaw tests of different vegetation slopes were conducted in the frozen soil testing ground of Kitami Institute of Technology (KIT, Hokkaido, Japan). Slope vegetatio...
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#2Dai NakamuraH-Index: 4
Last. Dahu RuiH-Index: 2
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#1Dahu Rui (CAS: Chinese Academy of Sciences)H-Index: 2
#2HongYuan DengH-Index: 1
Last. HongBo ZhaoH-Index: 1
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Abstract In order to investigate protection against the frost heaving of seasonal frozen soil behind precast L-type retaining walls in cold regions, test walls were installed in the campus of Kitami Institute of Technology (KIT, Hokkaido, Japan) in two sections (one incorporated countermeasures against frost heave and the other had no such countermeasures). The freezing front distribution and ground temperature within the backfill were observed and deflections of the walls were measured over thr...
2 CitationsSource
冬季の凍上と春季の融解沈下を繰り返す地域の法面では,融解期に表層すべりによる被害が多く発生する。凍上の発生方向は熱流方向に一致し,融解沈下の方向は鉛直下方に作用する重力の影響を受ける。この時,法面では凍上が発生する方向と重力の方向が異なるため,凍上した地盤の表面は元の位置に戻らず凍結前の位置より斜面下方に移動する。この移動の毎年の累積が,法面の崩壊を誘発すると考えられる。しかし,凍結・融解過程における実斜面の挙動をとらえた報告はほとんど見られず,合理的根拠に基づいた融解時表面すべり崩壊の対策工法は未だ確立していないのが現状と言える。本研究では,北見工業大学構内の盛土法面で,植生方法の異なる4つの試験区間を設け,5シーズンに渡って凍結・融解過程における法面の挙動を実測した。結果として,1)凍結・融解過程における有限長の法表面の凍上変位,融解沈下及びそれらの成分として現れる移動量が実測値として定量的にとらえられた。2)法面のすべり崩壊を誘発すると考えられる法面下方への移動は融解沈下時に発生し,その大きさは発生凍上量に加えて,植生の成育状況,さらには植生補強の有無によることなどが明らかになっ...
2 CitationsSource
#1Dahu RuiH-Index: 2
#2Young-Su KimH-Index: 4
Last. Teruyuki SuzukiH-Index: 5
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In order to investigate anti-freeze process of precast concrete L-type retaining walls in cold regions, test walls were installed in the campus of Kitami Institute of Technology (KIT, Hokkaido, Japan). The wall consists of following three sections, i) back filled with frost susceptible clay soil, ii) using thermal insulation material, and back filled with frost susceptible soil, iii) back filled with frost-unsusceptible soil. The freezing front distribution and ground temperature within the back...
#1Dahu RuiH-Index: 2
#2Teruyuki SuzukiH-Index: 5
Last. Keiji HayashiH-Index: 1
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廃棄物処理施設の確保の制約や処分場の埋め立て量に限界があることから,廃棄物を有効利用するための技術開発が図られている.筆者らは粒状廃棄物がL型擁壁の凍上対策の置換材料として代替可能であるかを屋外実験で検証し,廃棄物の新たな利用方法の開発を行ってきた.本論文では,袋詰めにした粒状廃棄物(EPS減容品,ガラスカレット)をプレキャストコンクリートL型擁壁に裏込めして,地盤凍結期における裏込め中の凍結状況や壁体変位の動態観測を行った.2シーズンにわたる実験から,凍上抑制置換材料として粒状廃棄物の活用が十分可能であることを明らかにした.
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#1Dahu RuiH-Index: 2
#2Teruyuki SuzukiH-Index: 5
Last. Seigo SawadaH-Index: 2
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本研究は寒冷地におけるプレキャストL型擁壁の凍上対策を検討するため, 北見工業大学構内に凍上対策をしない区間, 断熱工法及び置換工法を施した区間の三つの区間からなるL型土留め壁を試験設置した. 3シーズンにわたる地盤凍結期の裏込め土の凍結分布と壁体の挙動測定から凍結土圧の発生メカニズムを把握し, 更に断熱工法と置換工法の有効性を確認した. 次にシミュレーション手法によって各種断面形状のL型擁壁における裏込め土中の凍結面形状を推定し, これらの解析結果から置換工法における有効な置換範囲の決定方法を提案した.
2 CitationsSource
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