Geoscience Reference
In-Depth Information
Now, from formulae (3.15) and (3.13):
2
=−
sin(
21
25
.8
K s
1
048
=
sin(
)
02
02
h
k
34
020
K
057
=
=
=
h
r
Thus:
2
0 035 15 15 0571
5
5 1
571
.
Δ t
D
015
D
15
m
=
.
.
81
0070
48 29
.
070
015
098
D k
015
=
Shearing of the subsoil
As far as the shearing of the subsoil is concerned, the design graphs in Appendix C
show maximum allowable wave heights at D eq
=
D k
=
0.20 m and at a slope of
1V:2.5H. For a wave steepness of s op
=
0.03 and s op
=
0.05, H s
<
0.3 m applies.
0.50 m has been used. The relatively steep slope
means there is a risk of a shear failure of the subsoil, but the risk is small because, as
mentioned previously, the design graphs are conservative for mattresses. If required,
possible alleviation measures would be to lessen the slope angle (to approx. 1V:3H),
making the geotextile mattress thicker, or using a toe structure.
In this calculation example H s
=
Liquefaction
No danger of liquefaction exists in view of the slope being no steeper than 1V:2H and
the wave height not higher than 2.0 m (see 3.5.6).
 
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