Development of a new theory on the mechanism of movement of non aqueous phase liquids in the ground

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K15093
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 22030:Geotechnical engineering-related
• Research Institution: National Institute of Maritime, Port and Aviation Technology
• Principal Investigator: Nakamura Keita 国立研究開発法人海上・港湾・航空技術研究所, 港湾空港技術研究所, 研究官 (00827347)
• Project Period (FY): 2019-04-01 – 2021-03-31
• Keywords: 土壌汚染 / MPM / 剛体 / 摩擦接触 / 連続体

Outline of Final Research Achievements

The purpose of this study is to develop an analytical method to precisely solve the contact problem between a continuum (including fluids) and a rigid body (assuming soil particles), and to clarify the movement mechanism of NAPLs in void space in the ground by numerical analysis. The numerical method used in this study is one of the mesh-free methods called MPM. We develop the numerical algorithms which can simulate the interaction between the fluid and soil particles by using MPM and a rigid body. Specifically, we proposed a new frictional contact algorithm using MPM based on particle-to-surface contact. The proposed algorithm is applicable to the no-slip condition, which is usually used in the contact between fluid and solid.

Free Research Field

数値力学，地盤工学，土質力学

Academic Significance and Societal Importance of the Research Achievements

本研究で開発した数値解析技術は，連続体と剛体との摩擦接触解析手法であるため，流体だけでなく，あらゆる材料に適用することができ，今後更なる発展性が見込まれる。具体的に地盤工学分野に関する諸問題としては，地盤内に杭などの基礎を貫入させた際の地盤内の変形や，土砂に流される物体の挙動など多岐にわたり，社会的意義は非常に高い。本研究の主目的である地盤内の土粒子間隙内の流体の移動機構についても，今後開発した数値解析技術を用いてパラメトリックスタディを行っていくことで，メカニズム解明に寄与できる成果が得られる可能性が高い。