荆南长江干堤垂直防渗工程安全监测

在 1999～ 2 0 0 0年长江堤防隐蔽工程建设中 ,荆南干堤采用了水泥土防渗墙垂直截渗的方案。为了解防渗墙的截渗效果及大堤可能出现的险情 ,从公安埠河镇至斗湖堤镇 (全长 40 km )共 9个断面布置了安全监测仪器。汛期 ,实测防渗墙前后水头差达 1.0～ 3.0 m ,实测大堤最大水平位移为 2 .0 m m。观测成果表明 :荆南长江干堤在实施水泥土防渗墙后 ,延长了堤基的渗径 ,水泥土防渗墙起到了较好的截渗作用。

Safety monitoring on perpendicaiar impermeable wall in main embankment at Southern bank of Jinjiang

A Scheme of vertical impermeable wall built by mixing cement soil piles was adopted in the hidden engineering of levee at the southem bank of Jinjiang in the construction period from 1999 to 2000. In order to understand the anti seepage effect and probably exsistent defects, nine safety mnitoring sections were arranged from Gong'an Buhe town to Douhudi town (overall length being 40km). In flood season, the measured head drops before and behind the cutoff wall were from 1m to 3m, and the measured maximum horizontal displacement was 2mm. These results showed that the cement soil piles cutoff wall made percolation path of the dike foundation extended, cemented soil has played a beter role in water proofing.