Civil Engineering Reference
In-Depth Information
7. Use Program 6.4 to estimate the
active
force exerted by the soil on the wall shown
in Figure 6.56. (Ans:
F
≈
3
.
3kN/m)
5m
P
A
1m
f
'
= 30°
2m
c'= 0
g =
20 kN/m
3
Figure 6.56
8. Use Program 6.8 to repeat the excavation example described in Figure 6.38 using the
construction sequence of Cases D and E in Figure 6.37. (Ans: Case D fails after first
excavation of elements 9 and 10. Case E fails after fourth excavation of element 14)
9. Use Program 6.10 or 6.11 to investigate the influence of the third dimension
d1
on
the factor of safety of the cohesive slope shown in Figure 6.57. Gradually increase
the depth
d1
of the mesh and use the symmetry boundary condition
ifix=2
.
(Ans:
d1
1.4
2.1
2.8
3.5
4.2
plane strain
)
F
1.97
1.75
1.66
1.59
1.56
1.45
c
u
= 5 kN/m
2
f
u
= 0
g
d1
= 20 kN/m
3
1.5
1.0
2.0
2.1
1.0
Figure 6.57
References
Bishop AW and Morgenstern NR 1960 Stability coefficients for earth slopes.
Geotechnique
10
,
129-150.
Cormeau IC 1975 Numerical stability in quasi-static elasto-viscoplasticity.
Int J Numer Methods Eng
9
(1), 109-127.
