performs an automatic search for fa

performs an automatic search for factor of safety. The procedure is described in Section 3.8 in User's Guide (FLAC3D Manual) (Note 12), and applies only when the Mohr-Coulomb model is installed in all non-null zones.The following keywords apply:associatedassociated flow rule is applied, whereby the dilation angle is set equal to the friction angle, as modified by the fos procedure. (By default, the nonassociated flow applies.)bracketv1 v2sets two starting bracket values. FOS calculation stops with a warning message issued if it turns out that the FOS falls outside of the specified brackets. If v1 = v2, FLAC3D tests one value for stability.filefilenamesets the file name of the save file produced for the last unstable state. The extension "f3sav" will be added if none is given. By default, the save file is named "FOSUnstable.f3sav." If this file name already exists, then a two digit number resulting in a unique file name will be added to the end of the name before the extension.includekeyword . . .excludekeyword . . .Various items are included or excluded from consideration during the fos search, according to the list of keywords that follow include or exclude, respectively. The following keywords are allowed, denoting items that may be modified during the fos search.initfilefilenamesets the file name of the save file produced for the initial state. The extension "f3sav" will be added if none is given. By default, the save file is named "FOSInitial.f3sav." If this file name already exists, then a two digit number resulting in a unique file name will be added to the end of the name before the extension.interfaceinterface friction and cohesionstringproperty to include or excludeBy default, friction and cohesion are included.ncharncsets the characteristic response steps, nc. If not specified, nc is tested using the existing perturbation method.perturbvsets stress perturbation factor used in determining the characteristic response steps. (The default is 2.0.)ratiovresets unbalanced force ratio used to determine equilibrium. If this is not explicitly set, FLAC3D uses the current value used by the previous SOLVE command. (The default is 1e-5.)resolutionvsets the resolution in comparing two bracketing (stable and unstable) factors. (The default is .005 × the mean value.)stablefilefilenamesets the file name of the save file produced for the last stable state. The extension "f3sav" will be added if none is given. By default, the save file is named "FOSStable.f3sav." If this file name already exists, then a two digit number resulting in a unique file name will be added to the end of the name before the extension.