Experimental study on visualising and modelling heat-wate-NAPL-air multiphase flow in porous media

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K14304
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Geotechnical engineering
• Research Institution: Kyoto University
• Principal Investigator: Takai Atsushi 京都大学, 地球環境学堂, 助教 (30598347)
• Co-Investigator(Kenkyū-buntansha): FLORES Giancarlo 京都大学, 工学研究科, 准教授 (80598996) ; 乾 徹 京都大学, 地球環境学堂, 准教授 (90324706) ; 勝見 武 京都大学, 地球環境学堂, 教授 (60233764)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: 伝熱 / 非水溶性液体（NAPL） / 画像解析 / 圧密 / 混相流 / 地盤改良 / 環境地盤工学 / エネルギー地盤工学

Outline of Final Research Achievements

In this study, 1) visualising heat-water-NAPL-air multiphase flow in porous media and 2) clarifying temperature effects on physical and chemical properties of the ground were done. First, we have clarified the applicability of an image analysis method incorporated with an infrared camera using a vertically one-dimentional column. By using this method, we found that residual saturation degrees of water and LNAPL can be almost stable after 4th cycle of drainage and imbibition in a soil column and that reponse of ground temperature is more dependent on heating time than on heating temperature. Second, deformation of clay ground subjected to elevated temperatures was evaluated by an element-scale test and a large-scale tank test. Experimental results demonstrate that response ofground temperature is more dependent on heating period than on heating temperature. It was also clarified that the temperature effects on deformation is more significant with clay having higher water retentivity.

Free Research Field

地盤環境工学