Development of soil classification evaluation technique for liquefaction potential assessment in residential property based on Soil-Metal friction sound generated during ground surveying test.

2021 Fiscal Year Final Research Report

• Project/Area Number: 17H04935
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Geotechnical engineering
• Research Institution: Osaka City University
• Principal Investigator: yamada suguru 大阪市立大学, 大学院工学研究科, 准教授 (70451789)
• Project Period (FY): 2017-04-01 – 2021-03-31
• Keywords: 地盤調査 / 土質判定 / 液状化判定 / 動的コーン貫入試験 / サウンディング / 細粒分含有率

Outline of Final Research Achievements

To achieve an economic liquefaction assessment in the residential properties, a simplified method for evaluating the fines content of strata was developed using the friction sound measured during Heavyweight Dynamic Cone Penetration Test (HDCPT) operating. It was achieved, as an outcome of the current work, that the developed method can evaluate the outlines of the depth distribution of fines contents and can estimate the target soil stratum for liquefaction assessment with around 75% of probability. Further, case studies of liquefaction assessments employing fines contents estimated by the developed method were carried out on the investigated grounds then it was concluded that liquefaction safety rates (FL) estimated using friction sound were reasonably agreed with evaluated values from the FL method (Japan Road Association) based on SPT-N value.

Free Research Field

地盤工学

Academic Significance and Societal Importance of the Research Achievements

本研究では，大型動的コーン貫入試験実施中に地中で生じる摩擦音を利用した細粒分含有率の簡易推定法および液状化判定対象土層の推定方法を構築した。これは，従来サンプリングとサウンディングの両方が必要であった土質判定をサウンディングのみで可能とするものである。また，主に費用の問題で詳細な地盤調査が困難であった戸建て住宅地盤において，本研究の成果を応用するとこで経済的に液状化判定を実施することができるようになる。