Author(s): Kok Foong Loke, Norhan Abd Rahman, Ramli Nazir, Radzuan Sa'ari
Linked Author(s): Loke Kok Foong
Keywords: Porous media, vibration, fluid migration, vibratory table, digital image analysis
Abstract: The rapid growths of the country and evolution in manufacturing have contributed to climate change and natural disasters that give a negative impact on the environment and humans. The main issues are leaking and dumping of contaminants through the surface or subsurface that has experienced earthquake vibration and that probably cause groundwater pollution. Experiments on porous media such as deformable double-porosity soil still need to be understood and may provide more comprehensive understanding with respect to fluid migration under the phenomena of vibration. A physical experimental model is conducted to study the patterns of fluid migration in deformable double-porosity soil under the vibration effect by using image analysis. The double-porosity characteristic of the soil sample is created through kaolin soil aggregation with 25% moisture content and deformation by vibration at 0. 98Hz vibration frequency. In the experiment, the specially assembled acrylic soil column with triangle base plate is placed on the vibratory table to vibrate and monitor the whole area of acrylic circular columns. A digital image acquisition system using Nikon D90 Digital Single Lens Reflex camera is chosen to observe and capture images of the fluid migration pattern in fractured double-porosity soil sample at designated time intervals. Digital image processing and analysis technique is accomplished by using Matlab routine and Surfersoftware. The results show that the digital image analysis technique is capable to provide additional information such as the fluid flow rates and migration patterns in understanding the fluid migration behaviour. Outcome of the experiments shows that the fractured double-porosity has high permeability due to faster fluid migration and contributes to dominant factors for fluid migration in the subsurface system when the soil structure has been rearranged and loosened after vibration in double-porosity soil. This study indicates that the fractured double-porosity soil under vibration effect has severe ramifications on groundwater sources
Year: 2017