Civil Engineering Reference
In-Depth Information
Figure 7.18
Erosion of wet concrete by groundwater flow: pile in fill. (Photograph courtesy of CIRIA,
London.)
Figure 7.19
Effect of water inflow at head at pile.
cut-off level is below the groundwater level. For this situation to develop, the water
pressure would have to exceed twice the head of the concrete at the base of the casing.
The problem may easily be overcome by overfilling the pile or by filling the casing
above the pile with a little sand and topping it up with water.
If groundwater causes instability of the pile bore, drilling using a permanent casing
or a supporting fluid such as bentonite slurry should be resorted to.
