form a large mass. Figure 15 shows a rock revetment constructed of large individual stones. The
structure on Figure 16, on the other hand, is constructed of small concrete blocks that interlock when
placed. The small blocks would be easily moved by large waves but, when in place, the interlocking
feature makes them resistant to movement. However, once a block is displaced, adjacent blocks are
vulnerable and the structure can quickly unravel. In contrast, if an individual rock in the stone revetment
is displaced, other adjoining rocks readjust to fill the void so that it continues to function, even if
damaged. This is called "reserve strength".
Flexibility
Strength or wei
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