Ultimate reasonable countermeasure for wall against earthquake

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K15265
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 25030:Disaster prevention engineering-related
• Research Institution: Tokai University
• Principal Investigator: Fujiwara Kakuta 東海大学, 工学部, 助教 (40824925)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 地震 / 耐震 / 壁 / 構造物 / 液状化

Outline of Final Research Achievements

Two countermeasures ware proposed for reinforcement wall against earthquake reasonably. One is that piles with low rigidity are inserted in backfill ground. The other is that air packs are buried in backfill ground. The effectiveness for reduction of deformation of the wall could be found through several model tests. These countermeasures had advantage against relatively weak earthquake. Optimum position of these countermeasures in actual field should be discussed in the future. Furthermore, reasonable wall itself was also studied. In this study, embankment reinforcement by sheet-piles that has partially short piles was discussed.

Free Research Field

地盤耐震

Academic Significance and Societal Importance of the Research Achievements

地震による壁構造を損傷・崩壊を抑制するための、安価な工法を２つ（空気袋、弱い剛性の筒）提案した。いずれも相対的に弱い地震対して効果的であった。弱い地震は発生頻度が高いため、安価に数多くの小規模な損傷を防ぐことが期待できる。一方で、強い地震動については、構造物によっては損傷を許容するという考え方もある。重要施設や人命にかかるような構造物の場合、十分な費用を投じて対策を講じる必要がある。