The offshore caisson breakwater at Costa Azul installed in 25m water depth is designed to withstand Pacific swell waves up to a PLS test case Hs 9.2m Tp 18.6s. Overall stability design is in accordance with the recommendations of PIANC WG 28. The critical failure mechanism is sliding, and the caisson base is cast with a deliberately roughened (serrated) profile to increase sliding resistance and optimize the caisson cross section. Site based testing at prototype scale was conducted to validate the coefficient of friction used for design between the caisson base and nominal 100mm single size granular bedding material. This testing confirms that the use of a suitably dimensioned serrated base profile allows the full internal angle of friction (with allowance for dilation) of the bedding material to develop at the base of the caisson, allowing the cross section design to be optimized.
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机译：安装在25m水深处的Costa Azul的海上沉箱防波堤设计用于承受Ps测试用例Hs 9.2m Tp 18.6s的太平洋激波。总体稳定性设计符合PIANC WG 28的建议。关键破坏机制是滑动的，沉箱基座的浇铸是刻意的粗糙（锯齿状）轮廓，以增加滑动阻力并优化沉箱横截面。在原型规模上进行了基于现场的测试，以验证沉箱基座和标称100mm单尺寸粒状垫层材料之间设计所用的摩擦系数。该测试证实，使用适当尺寸的锯齿形底部轮廓，可在沉箱底部形成垫层材料的整个内部摩擦角（允许膨胀），从而优化横截面设计。
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