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.