Development of the confined pressure type of multi-purpose rock flow system and its application to the evaluation of permeability of various geomaterials

摘要

A new apparatus, confined pressure type of multi-purpose rock flow system, was developed and its applicability was verified. This system is based on the flow pump type of permeation system, and permeation tests can be easily conducted under the high confining pressure condition and peculiar conditions like as super criticalCO2. Moreover, X-ray CT tomographying during permeation tests is also possible. The system was applied to the permeability evaluations of low/high permeability rocks and bentonite, and the permeability was successfully evaluated. Moreover, it was shown that the swelling process of bentonite and the replacement process of CO2 in the rock sample could be visualized by X-ray CT during permeation tests.