COASTAL ENGINEERING - Introduction to Soft Soil Geotechnique: Content, Context and Application - page 292

armour cube 25 ton) the grain size distribution curve is presented (with some
scatter). Compose the best possible filter structure, from AM to SA.

SA GR QW QR FI

100

AM

80

60

40

20

0.001 10

0
0.0001 0.01 0.1 1

D [m]

Figure 16.25

application 16.5
Determine the maximum cyclic excess pore pressure for a sand layer subjected to a
storm surge with a wave train of 200 large waves. The following data is provided:
layer thickness d = 4 m, submerged unit weight ' = 10 kN/m 3 , wave period T c = 8

s, porosity at the site n = 0.4, permeability k = 2x10 -4 m/s, compressibility = 10 -5

m 2 /N. In an undrained test in the lab: liquefaction number N l = 50, '= 0.3, initial

set-up u 0 = 0.0, critical density n c = 0.38.

application 16.6
Determine the internal set-up in a breakwater for a wave with amplitude of 6 m
and a period of 12 s. At the rear side of the breakwater a solid ground body exists
(closed end); at the average water height the breakwater is 10 m wide. Other
numerical data are: average water depth is 10 m, porosity 0.4, permeability 0.1 m/s,
and the slope angle 40º. There is no air intrusion ( c a = 1).