Evaluation of steady-state of sands using shear box test

2020 Fiscal Year Final Research Report

• Project/Area Number: 18K04349
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 22030:Geotechnical engineering-related
• Research Institution: Tokyo Metropolitan University
• Principal Investigator: Yoshimine Mitsutoshi 東京都立大学, 都市環境科学研究科, 准教授 (80251338)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: 一面せん断試験 / 砂 / 定常状態

Outline of Final Research Achievements

It is ordinary assume that the shear box test is not suitable for measuring strain and density of sand because of the non-uniform deformation of the specimen. I assumed simple distribution of density in the sample at stead state, and using this assumption, I proposed a method for evaluating density-strength relationship at steady-state of sands. The validity of the method was confirmed from numerous shear box tests on various sands. X‐ray CT tests, triaxial tests as well as simple shear tests were done for the comparison purposes.

Free Research Field

地盤工学

Academic Significance and Societal Importance of the Research Achievements

定常状態における土の密度と有効応力の関係を正確に測定することは、液状化強度問題や土の変形特性予測で重要である。室内要素試験による砂の定常状態の評価には、供試体変形の均一性の観点から非排水三軸圧縮試験が一般的に用いられている。しかし，一面せん断試験の方が圧倒的に実験が簡易かつ短時間で経済的に行うことができるから、もし一面せん断試験で砂の定常状態を正確に測定することができれば大変に便利である。