Pioneering a new environmental geotechnics through soil-water-(L,D)NAPL-air four to five multiphase theory

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K14028
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Geotechnical engineering
• Research Institution: Yokohama National University
• Principal Investigator: Kikumoto Mamoru 横浜国立大学, 大学院都市イノベーション研究院, 准教授 (90508342)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 非水溶性液体 / 土壌汚染 / 多相浸透解析 / 土-水-NAPL-空気4相連成解析 / 有限要素法 / 修正Picard法 / 質量保存則 / 浸透変形連成解析

Outline of Final Research Achievements

Soil contamination caused by NAPL, that flows independently from water and air, should be effectively checked by combining field survey and numerical simulation. However, in in situ remediation, ground deformation accompanying the change in pore pressure is concerned. In landfilled polluted grounds, contaminated fluids may transport due to liquefaction. Though coupled analysis of multiphase seepage and deformation will be necessary for such issues, deformation - seepage coupled problems of soil-water-NAPL-air 4 phases has not yet solved. Thus, this research the first challenge for such issues.
First, we propose a seepage analysis of water-NAPL-air three phases based on a new spatial discretization maintaining mass conservation strictly, and showed a remarkable improvement in convergence speed and stability of calculation. Next, the finite element method for deformation-seepage coupled problem of soil-water-NAPL-air 4 phases was proposed.

Free Research Field

地盤工学