Underground Singapore 2011 Fig. 4a Model A: Final excavation step- Vert ground movement behind
Fig. 4b
Wall pore pressure diagram
wall 105.0
0.050 0.000 -0.050 -0.100 -0.150
100.0 95.0
25
35
45
55
Model A:PLAXIS
Model A:CRISP
Model D:CRISP
Model D:PLAXIS
65
90.0 mRL
15
85.0
Final excavation step- Vert movement of excavation floor
80.0
0.750
75.0
0.550 0.350
70.0
kPa
0.150 65.0
-0.050
300
0
2
4
6
Model A:PLAXIS Model D:CRISP Model A:Crisp (Beam element)
8
10
12
14
Model A:CRISP Model D:PLAXIS
200
100
0
-100
-200
-300
16 Model A:PLAXIS
Model A:CRISP
Model D:CRISP
Model D:PLAXIS
Figure 4a. Vertical movement behind wall and excavation floor at final excavation step (Model D). Figure 4b Pore water pressure
5.2 Graphical comparison of PLAXIS and CRISP Results of Models A (penultimate excavation step) and D (final excavation step) produced by PLAXIS and SAGE CRISP are compared. The comparisons comprise wall bending moment profile, wall horizontal displacement, total pore pressure (active and passive), total pore pressure contour, flow net diagram, vertical movement of ground surface behind wall and excavation floor and these are shown in Figures 3 to 6 . Results of Model A modelled with Sage Crispâ€&#x;s beam element for wall is shown in Figure 3a and 4 (vertical displacement on excavation floor). Finally, Model D, modelled with Sage Crispâ€&#x;s in-built slip element is also shown in Figure 3b.
Figure 5. Pore water contour and flow net (Model A: PLAXIS and CRISP)
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