Ultrasonic Removal of Geosynthetics Clogging

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This paper presents an experimental investigation of the ultrasonic removal of clogging of six commercially available geotextiles. The clogged specimens were exhumed from two fine-grained soils, which were previously consolidated from slurry stage under a consolidation pressure of 400kPa. The mechanism of ultrasound and formation of micro-bubbles in a sort of "cold boiling" or "cavitation" within liquid medium have been explained. The in-plane and cross-plane flow capacities of the clogged geotextile specimen have been evaluated before and after ultrasonic cleaning and results are presented in a design chart signifying the beneficial effect of ultrasonic cleaning. With increasing confining pressure clogging caused more reduction in the cross-plane flow capacity than the in-plane flow capacity. Ultrasonic cleaning efficiency for all clogged geotextiles was more than 80% @ 5 minutes washing time. The thinnest (2.2mm) geotextile was severely affected by clogging, however, after ultrasonic cleaning the clogging potential reduced to unity, which was not affected by increasing normal pressure.
国際ジオシンセティックス学会日本支部の論文