Two additional tests were undertaken with refined

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: on increase the risk of stone degradation and breakage; • Loss of larger armour stone to lower slope represents a waste. Two additional tests were undertaken with refined cross-sections, with various modifications made to reduce stone motion and profile development, including: • Reduced slope on upper berm; • Tighter placement of armour stone above water level; In addition, various transition details were tested between the “root” of the breakwater (located in the shelter of Pointe Ehoala) and the full cross-section. The final test included detailed documentation of breakwater profile development throughout two design events, as well as extended test durations following the storm peak to assess residual stone motion. In addition, sensitivity tests were undertaken to assess the impact on stability of smaller (1015 t) or larger (18-25 t) stone in the primary berm. Figure 10 presents profile measurements collected during the final test series; these results demonstrate the limited profile development that occurred in the final test. 11 15 10 5 0 -5 -10 Design profile 0 hours 2 hours 4 hours -15 6 hours Core profile -20 0 5 10 15 20 25 30 35 40 45 50 55 60 65 Figure 10 – Profile Measurements During Final Test of Full Cross-Section Figure 11 illustrates the final design cross-section, as tested in the physical model (the dark area is the interim armour layer). Relative to the preliminary design (refer to Figure 7), the final design is more efficient, providing better performance (i.e. reduced stone motion and profile development) with a smaller total volume of stone, and a reduced proportion of the largest stone class. Figure 11 – Final Design Cross-Section for Breakwater BIDDING AND CONSTRUCTION The Port d’Ehoala project was bid using the World Bank’s two stage process. Five contractors were pre-qualified and submitted Initial Technical Proposals (ITPs) in June 2006. As expected, the five ITPs included varied construction approaches and equipment, and several different structural concepts for the...
View Full Document

This note was uploaded on 02/04/2014 for the course HE 8450 taught by Professor Verhagen during the Spring '14 term at Technische Universiteit Delft.

Ask a homework question - tutors are online