Shigeo Honma

Transparent Aquabeads To Visualize Flow In Porous Material

Use of transparent synthetic soils to visualize flow problems has recently been developed with an optical system and digital image processing. This paper proposes a new water-based transparent material called Aquabeads suitable for modeling natural soils. As feasibility of using Aquabeads to visualize geoenvironmental problems, surfactant flushing tests were conducted to simulate Light Non-Aqueous Phase Liquid (LNAPL) ganglia transport through Aquabeads model with clay lens was performed. The upward migration of motor oil ganglia during surfactant flushing was visualized. Aquabeads possess advantages over available transparent synthetic soils ; water-based material, similar macroscopic hydraulic characteristics to natural soils, compatible with water- oil- selected surfactants-alcohols used for simulating multiphase flow. Therefore, it is ideal for visualizing 2D flow, and soil contamination problems.

A METHOD OF MANAGEMENT IN SOIL COMPACTIONS BY MEANS OF IMPACT LOADING METHOD

締固め管理のための重錘落下法に関する研究が各機関で行われている. 重錘落下法には, 重錘衝突時の加速度値や, 加速度と荷重値を測定し地盤の締固め度を間接的に判定する2種の方法が提案されている.本報告は, 動的応答特性に問題のあると言われている加速度計を用いず, 重錘衝突時の荷重値計測のみから, 静的支持力を推定し, 直接的に締固め管理に利用できる方法について提案したものである.