PIANC E-Magazine - PIANC AIPCN welcome
PIANC E-Magazine - PIANC AIPCN welcome
PIANC E-Magazine - PIANC AIPCN welcome
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5. DESIGN BASED ON FAILURE<br />
MECHANISM 1<br />
As mentioned above, at this point in time it was<br />
believed the only failure mechanism was Failure<br />
Mechanism 1. Design of the breakwater repairs<br />
by WSP Africa Coastal Engineers based in South<br />
Africa, combined with budgeting constraints imposed<br />
by the client led to the following:<br />
Ch 66 m to Ch 96 m (30 m length)<br />
• Demolish the affected 30 m section of concrete<br />
roadway.<br />
• Replace lost core with 10-500 kg core material.<br />
(The original 0-10 kg fragment of the 0-500 kg<br />
size range was omitted in the tender design to<br />
comply to filter rules).<br />
• Rebuild concrete roadway to 800 mm thick.<br />
(The original structure was 500 mm thick).<br />
• Rebuild 1-3 t double layer rock profile to original<br />
2V:3H lines and levels by using existing rock<br />
and importing the shortfall (if any).<br />
• Overlay the 1-3 t double layer rock armour with<br />
a single layer 4-6 t rock armour to 2V:3H slope.<br />
Ch 96 m and Ch 126 m (30 m length)<br />
• Rebuild 1-3 t double layer rock profile to original<br />
2V:3H lines and levels by using existing rock<br />
and importing the shortfall (if any).<br />
<strong>PIANC</strong> E-<strong>Magazine</strong> n° 144, November/novembre 2011 14