Civil Engineering Reference
In-Depth Information
New scalar integers:
layers
number of excavation steps
noexe
number of elements to be removed at each step
number of nodes at which output is required
nouts
holds running total of number of excavated elements
ntote
New dynamic integer arrays:
exele
element numbers of removed elements
identifies “air” elements (
=
0 for “air”,
=
1 for solid)
solid
holds element numbers for all removed elements
totex
New dynamic real arrays:
exc loads
excavation loads
tot d
holds running total of nodal displacements
Figure 6.37 shows a square block of “soil” from which a vertical cut is to be excavated.
The figure indicates five possible sequences that would lead to the same final excavation
geometry. Figure 6.38 shows the mesh and data corresponding to excavation case B in a
soil with undrained shear strength
9kN/m
2
.
c
u
=
Case A
Case B
Case C
Case D
Case E
Figure 6.37
Five ways of excavating a vertical cut
