Geotechnical feedback

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  1. Implementation of soil layering formulation as per Geogiadis

    Implementation of soil layering formulation as per Geogiadis M (1983). Development of p-y Curves for Layered Soils. Proc. Geotechnical Practice in Offshore Engineering, ASCE, pp. 536-545.

    7 votes
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      0 comments  ·  Alp  ·  Flag idea as inappropriate…  ·  Admin →
    • Direct output of equivalent reaction stiffnesses for wall elements

      See also "Direct output of equivalent subgrade reaction stiffnesses". Pdisp allows the input of horizontal loading on a vertical plane. Equivalent subgrade reaction stiffnesses (reaction springs) for wall elements could be obtained from applied horizontal pressure and resulting movements.

      1 vote
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        0 comments  ·  Pdisp  ·  Flag idea as inappropriate…  ·  Admin →
      • Direct output of equivalent subgrade reaction stiffnesses

        Pdisp is often used to derive subgrade reaction stiffnesses for input into GSA by manually dividing the applied pressure by the settlement results to calculate the equivalent subgrade reaction springs. The conversion could be built into PDsip itself and a subgrade reaction contour could be plotted. There’s a possible automation linkage with GSA.

        1 vote
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          0 comments  ·  Pdisp  ·  Flag idea as inappropriate…  ·  Admin →
        • 1 vote
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            0 comments  ·  Xdisp  ·  Flag idea as inappropriate…  ·  Admin →
          • 1 vote
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              0 comments  ·  Xdisp  ·  Flag idea as inappropriate…  ·  Admin →
            • Ability to input both compression and tension loads in the same file

              It is currently not possible to apply both tensile and compressive loads in the same file to compare against the calculated resistances. The programme subtracts the tensile loads which are applied as negative loads from the compressive loads which are positive instead of recognising them as separate loads.

              1 vote
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                0 comments  ·  Pile  ·  Flag idea as inappropriate…  ·  Admin →
              • Superimpose the layer name on the FREW graphical output

                Presently in the FREW graphical output each layer is labelled with a number. If the graph is printed/copied on a report there is no way for the reader to understand which geomaterial the model refers to withouth having access to the materials properties table. Superimposing the name given by the user on the graph improves legibility.

                0 votes
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                  0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                • 3 votes
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                    0 comments  ·  Slope  ·  Flag idea as inappropriate…  ·  Admin →
                  • 2 votes
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                      0 comments  ·  Alp  ·  Flag idea as inappropriate…  ·  Admin →
                    • Include pile pinning in Slope

                      We would like to be able to model piles in Slope, with specified mobilised shear resistance across the failure surface. This would ideally (in future) be linked to a mobilised shear-displacement profile for each pile derived from Alp. The mobilised shear can be specified apriori for the pile or pile group, or determined from Newmark Sliding Block analysis with the shear-displacement curve. Get in touch for details.

                      3 votes
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                        0 comments  ·  Slope  ·  Flag idea as inappropriate…  ·  Admin →
                      • Limit on tension in props

                        Please can you allow a limit to be set to prevent props going into tension? Currently a multi-propped wall with no embedment doesn't fail as the top prop goes into tension.

                        1 vote
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                          0 comments  ·  Frew  ·  Flag idea as inappropriate…  ·  Admin →
                        • Minimum equivalent fluid pressure

                          A new update allows you to edit the MEFP at each stage and in each material. However, it defaults to y0=0 at each stage and therefore is not applied unless you go through each stage and change this. Please can the MEFP default to the top node level unless specified otherwise?

                          1 vote
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                            0 comments  ·  Frew  ·  Flag idea as inappropriate…  ·  Admin →
                          • Extend Pile to model embedded retaining walls as a rectangular panel

                            Where embedded pile retaining walls carry axial loads, it is common practice to analyse the section as a rectangular panel rather than individual circular piles (with a reduced end bearing co-efficient akin to a deep strip footing).

                            To date, we have achieved this by modelling an under-ream pile with different shaft and base diameters. However, it would be simpler and clearer if Pile could analyse a rectangular section. This would also be beneficial for calculation of axial resistance for diaphragm wall panels.

                            Refer to method of Hov et al from 2010 DFI Conference (attached).

                            1 vote
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                              0 comments  ·  Pile  ·  Flag idea as inappropriate…  ·  Admin →
                            • Multiprocessing and result plotting improvements

                              Add parallel processing capability to SIREN so that two, four or eight time histories can be run in parallel (depending on processor capabilities) rather than sequentially. (NB: This capability is currently a feature of Deepsoil).

                              Consider adding more than one soil profile for analysis to an input file, as we typically run three versions of a soil profile to consider uncertainty in the input stiffness profile (upper, lower bounds and best estimate). The same time histories are run through each profile.

                              With typically three stiffness profiles considered per soil profile, and 7-pairs of records (14 No.) per profile, and often…

                              1 vote
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                                0 comments  ·  Seismic  ·  Flag idea as inappropriate…  ·  Admin →
                              • 1 vote
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                                  0 comments  ·  Alp  ·  Flag idea as inappropriate…  ·  Admin →
                                • Graphical output shall show all wall dimensions on screen

                                  Hi , currently graphical output is not showing wall dimensions, its good if it shows all dimensions and can be exportable to auto cad program

                                  1 vote
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                                    0 comments  ·  Greta  ·  Flag idea as inappropriate…  ·  Admin →
                                  • Specify soil nail bond strength for each strata

                                    The ability to specify a single bond strength between a soil nail and the surrounding soil (using CIRIA guidance or preliminary test data) does not work if the soil is layered. The user should be able to specify the bond strength for each strata.

                                    33 votes
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                                      0 comments  ·  Slope  ·  Flag idea as inappropriate…  ·  Admin →
                                    • Add inclined Piles

                                      Alp now handles only perfectly vertical piles, it could be nice if it handles inclined piles

                                      0 votes
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                                        0 comments  ·  Alp  ·  Flag idea as inappropriate…  ·  Admin →
                                      • Westergaard

                                        hi , please introduce Westergaard method in Pdisp . this method is popular in India

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                                          0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                                        • 2 votes
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                                            1 comment  ·  Frew  ·  Flag idea as inappropriate…  ·  Admin →
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