2021 Fiscal Year Final Research Report

Research aimed at disaster mitigation by advancing residential land geotechnical investigations on the premise of low cost

Research Project

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Project/Area Number	19K04700
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Review Section	Basic Section 23010:Building structures and materials-related
Research Institution	Nihon University Junior College
Principal Investigator	SAKO Noriaki 日本大学短期大学部, その他部局等, 教授 (00435273)
Co-Investigator(Kenkyū-buntansha)	平出務国立研究開発法人建築研究所, 構造研究グループ, 研究員 (40370704) 下村修一日本大学, 生産工学部, 准教授 (50443726) 仲村成貴日本大学, 理工学部, 教授 (80328690)
Project Period (FY)	2019-04-01 – 2022-03-31
Keywords	地盤調査 / 小規模建築物 / スクリューウェイト貫入試験 / 沈下 / 液状化 / 土質分類 / 常時微動 / 減災
Outline of Final Research Achievements	Small buildings have different ground survey circumstances from large buildings, and there is little knowledge about geotechnical investigation research on residential land, because they have a short history. On the other hand, there are many subsidence accidents and many damages caused by recent large earthquakes on small buildings.This study is aimed to improve to be advanced the ground survey of small buildings on the premise of low cost. The research results are as follows: (1) The screw weight penetration test (SWS), which is the mainstream of geotechnical investigation of residential land, can have a soil classification function, (2) The risk of liquefaction can be evaluated directly from SWS data, and (3) The height distribution of cuts and embankments, which are often caused subsided accidents, can be estimated from constant tremor measurement.
Free Research Field	建築基礎工学
Academic Significance and Societal Importance of the Research Achievements	近年，戸建て住宅の沈下事故や大地震時の液状化による被害は，一つの原因として調査費用を増やすことができない，もしくは費用を掛けて詳細な調査をしても無駄になる宅地の地盤調査の複雑な事情が挙げれる。そのような状況を打開するため，本研究では，低コストを前提とした宅地地盤調査の高度化を目指した。現行の宅地地盤調査の主流であるスクリューウェイト貫入試験および常時微動から得られるデータから土質分類，液状化強度および切盛土が評価できる情報を増やしたことにより，低コストな地盤調査からでも減災を目指すことができることを示した。