Restoration characteristics of damaged Emergency Transportation Routes caused by earthquake-induced slope failures

2019 Fiscal Year Final Research Report

• Project/Area Number: 17K01343
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Natural disaster / Disaster prevention science
• Research Institution: Hosei University
• Principal Investigator: SAKAI Hisakazu 法政大学, デザイン工学部, 教授 (00360371)
• Co-Investigator(Kenkyū-buntansha): 小野 祐輔 鳥取大学, 工学研究科, 教授 (00346082)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: 復旧性 / 道路ネットワーク / 地震 / 孤立地域 / 道路規制 / 緊急輸送道路 / 道路防災点検データ / 斜面カルテ

Outline of Final Research Achievements

From viewpoints of geology and statistic, we analyzed the slope failure characteristics during earthquakes based on the damaged slope data, slope stable property lists, seismic indexes, precipitation, and geological, soil and vegetation maps and so on. We proposed the methodology of the stochastic estimations of earthquake-induced landslide and blockage of road caused by the landslide. We verified the methodology based on the data road traffic restrictions after the 2004 Niigata-ken Chuetsu earthquake. We applied the method to the emergency transformation routes in Wakayama prefecture after the Nankai trough mega scenario earthquake. The route blockage rates calculated from the analysis taught us the regions with high isolation risk and the priority for the slopes to reinforce.

Free Research Field

地震地盤工学

Academic Significance and Societal Importance of the Research Achievements

地震強度と崩壊要因をともに考慮した簡易的に斜面耐震性評価手法を提案するとともに，過去の被害地震における斜面災害と復旧期間の関係資料を国や地方公共団体から収集し，統計分析により斜面災害と緊急車両通行までの復旧期間の関係を明らかにした．
中山間地域の孤立地域・期間を縮減するために，南海トラフ巨大地震後の和歌山県を対象として，斜面の地震対策の優先度を決定する方法論について検討し，その有用性を示した．