Containment dykes artificial islands

Containment dykes are constmcted for land reclamation and artificial islands to prevent the loss of fill by erosion during construction. Typical containment dyke layouts are shown in Fig. 20.24. The containment dyke delineates the extent of the reclamation land area boundary and consists of erosion-resistant materials. The fill inside the containment dyke may be installed by hydraulic means or by dry placement. 

Lawson (2008) describes the construction of an artificial island using a geotextile mbe containment dyke for the overhead viaduct approaches to be constructed wholly above water for the Grand Incheon Bridge in Korea (Fig. 20.27). The foundation conditions consisted of soft marine clay, which made alternative containment solutions. 

Figure 20.27 Geotextile tube containment dyke for artificial island, Grand Incheon Bridge, Korea, (a) Cross section through geotextile tube containment dyke and (b) constructed artificial island.

---