Breakwater w.l. 2.0m 1.8 m g.l. # 2.0 m 3 m = 26 26 = 17 kN/m3 eo = 1.7 C = 0.3, = 0.04 Clay Impermeable Bedrock A break

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Breakwater W L 2 0m 1 8 M G L 2 0 M 3 M 26 26 17 Kn M3 Eo 1 7 C 0 3 0 04 Clay Impermeable Bedrock A Break 1 (132.38 KiB) Viewed 13 times

Breakwater w.l. 2.0m 1.8 m g.l. # 2.0 m 3 m = 26 26 = 17 kN/m3 eo = 1.7 C = 0.3, = 0.04 Clay Impermeable Bedrock A breakwater is built to protect a coastal area from wave action, a cross section of the site is in the figure shown above. The breakwater is built out of concrete (unit weight of 24kN/mº). All relevant soil parametric values are given in the figure above. Assuming the clay layer was normally consolidated prior to the breakwaters construction, complete the following exercise. Presume immediate settlement has already occurred. a. Directly under the centre of the breakwater, calculate and sketch profiles of the vertical and horizontal effective stress from the ground surface to bedrock before and after construction. (12 marks] b. Briefly explain in your own words what is happening in the clay layer during pore pressure equalisation (10 marks] c. Calculate the consolidation settlement underneath the centre of the breakwater. (10 marks] d. Assuming the water levels stay constant (i.e. ignoring wave and tide action), when will the water levels overtop the breakwater? Use co = 0.003m²/day in your calculations. State any assumptions made [8 marks]