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Slope Stability Analysis  2- 1 2 Slop e Stab ility Anal ysis This example addresses a common problem in soil mechanics: the stability of a soil slope. For this tutorial, we begin with a stable excavated slope, and then raise the water table, which causes slope failure to occur . The example is similar to that in Section 1  in the  Examples volume  of the FLAC 4.0 manual, in which a groundwater ow calculation is performed rst to raise the phreatic surface, and then an effective-stress calculation is performed to analyze the mechanical stability. The model is create d usi ng FLAC ’s gra phi cal int erface, the GIIC . We wil l perf orm this analysis usi ng the groundwater ow mode (CONFIG gw), so we rst select  GWFlow in the Model Options dialog box. We also select automatic adjustment of total stresses ( CONF IG ats ) by checking the  Adjust Tot. Stress box because we will change the pore pressure boundary condition to simulate raising of the water table. We will perform this analysis using the SI system of units and record the data in the  Project Tree record mode. (We check the  Tree radio button in the  Project Record Format .) We press  OK to acti vate all of these optio ns. Remember that these options can only be activ ated before the model is created. (Select  File / New Project to start a new model.) We now set up a project save le by selecting the  File / Save Project As  menu item in the main menu. We select a directory in which to store les for this analysis and save the projec t as “SLOPE.PRJ.” We are now ready to begin creating the model. We generate the grid for the slope by pressing the  Build modeling-tool tab and then click on the Block but ton in the toolbar. This tool allows us to divide our grid into separat e regions (or block s) of grid; each block can then be given different grid dimensions. We press  OK in the dialog to select the defaul t grid (two blocks by two blocks). An Edit Block Grid  dialog will now appear (as shown in  Figure 2.1), in which we can input the  x - and  y -coordinates, the number of zones and the grid ratios for each block. The parameters to dene a coarsely zoned model of the slope are shown in Figure 2.1.  Figure 2.1 Edit Block Grid dialog box FLAC Version 4.0

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