To reduce or eliminate uplift pressure by providing drainage.

REDUCTION OR ELIMINATION OF UPLIFT PRESSURE

Object:-To reduce or eliminate uplift pressure by providing drainage.

Apparatus:-Permeability tank.

Theory:-If we want to reduce uplift pressure but are not interested in reducing the rate of seepage at the same time, the most convenient way to do it is by using a downstream drain in the form of a title line or a trench. In this manner, the flow lines are drawn downwards and the uplift pressure is reduced or even entirely eliminated.

Experimental

Setup:-The setup is basically the same as in Experiment # 05 with an additional element consisting of a drain provided at the downstream side so as to drain partially or completely the seeping water and subsequently reduces or eliminate of the uplift pressure. Water is poured in and the uplift pressure profile is visualized by the rise of water in the standpipes.

Observations:-

For each of several depths of the sheet pile, the uplift pressures registered in stand pipes is recorded and the flow lines are visualized.

Graph:

[Attach the Uplift pressure profile]

Result: –By providing drain at the downstream uplift pressure is partially reduced / completely eliminated as shown in plot.

Conclusion: –