Cut-off walls
CUT-OFF WALLS

Cut-off walls

CUT-OFF WALLS Cut-off wall is a device use to reduce or prevent the seepage of water through the pervious foundation. It is always provid below the upper surface of the foundation. If the cut-off wall extends through the foundation to impervious material below, it is called complete cut-off wall. If it penetrates only a part of the pervious foundation, it is know partial cut-off. Partial cut-off walls are not very effective in reducing the seepage through a pervious foundation.  Following are the advantages of cut-off walls. Danger of seepage along the contact surface of the foundation and the dam embankment is reduced. It reduces the seepage through horizontal cracks, fissures and pervious seams in the foundation. Almost all the soils deposited by water are stratified or have layers of materials of various sizes. A vertical cut-off will penetrate a number of these layers or strata and thus force the seepage…

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