2022 Fiscal Year Final Research Report
Development of new pavement structure reducing stormwater runoff of roadway
| Project/Area Number |
20K05048
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 25030:Disaster prevention engineering-related
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| Research Institution | Yamaguchi University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 雨水貯留浸透施設 / 透水性舗装 / 側面流入型舗装 / 水理特性 / 力学耐久性 |
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| Outline of Final Research Achievements |
This study proposes new pavement structure for roadway rainwater runoff control which is expected to be alternative to permeable pavements. The structure collects rainwater to roadside ditch and leads it laterally to granular subbase course through inlets on the wall of the ditch. One expected advantage of this is that it allows inflow only during peak-time of rare big floods such as several-year-return period. We conducted hydraulic model experiments to investigate basic lateral inflow characteristics to granular subbase course. Number of inlet holes on the ditch wall and their locations were varied in the experiment. The results showed that the amount of inflow into the roadbed affects the water table difference. It was also found that grain size of subbase course material affects horizontal permeability because it changes the pore system, but does not significantly affect the ability of the roadbed to store water because the porosity itself does not change.
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| Free Research Field |
舗装工学
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| Academic Significance and Societal Importance of the Research Achievements |
透水性舗装に代わる雨水貯留浸透用舗装として，側溝側面から粒状路盤に流入する側面流入型舗装を提案する．この構造は洪水ピーク時のみ選択的に舗装内に雨水を導くものであり，透水性舗装に比べて浸水にともなう舗装の力学耐久性の低下を抑え，確実な洪水ピークカットなどが期待される．本研究では，提案構造の側方流入特性を明らかにするため，ガラスビーズを用いた水理模型実験を作成し，一定流量条件および一定水位条件で流入実験を実施した．実験の結果，路盤への側方流入の速度は，側溝側と路盤側との水位差および開口面積に依存することが明らかとなった．
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