Abstract: High-frequency vibratory hammer sheet wall technology is widely applied to sand levee foundation in vertical cutoff wall construction. To explore a construction method of vertical cutoff wall dealing with sand-gravel levee foundation in Dongting Lake areas, some improvements of this technology including construction techniques and flow chart are made, and computer control in the course of construction is realized, then this method is applied to Zhoujiawan project. And some detections including enclosed well test, coring bit and piezometric tube are used to verify the effect of thin cutoff wall. Experimental studies indicate that improved high-frequency vibratory hammer sheet wall technology has the advantages over traditional grouting technology, such as continuum, integrity in forming wall, good anti-seepage effect, high construction efficiency and low costs, and it is an effective kind of vertical cutoff wall technology applied to sand-gravel levee foundation, it can be used to treat with the levee project in Dongting Lake areas and any other region with the same geological features.

Key words: high-frequency vibratory hammer sheet wall technology；cutoff wall, plastic concrete, sand-gravel levee foundation