Consider the following long sheet-piled trench built within a uniform sandy ground of 18 m in depth, overlying an impermeable clay layer.

2.1 Sketch a flownet. Ensure your sketch is made to scale. Show the values of N_F and N_H for the flownet in your sketch.                                                        

2.2 Based on the flownet sketched, determine and sketch the water pressure acting on the sheet pile wall.

                                                                                   

 

Sheet pile Constant external Constant external water level water level 6 m Pumped water level 6 m 5 m Uniform sand 6 m "Impermeable' clay Figure 1: flownet