Version (2015/04/17)

NEW Features:

  • The PROWEAP module is now available for all users. PROWEAP allows back-calculating the Soil Resistance to Driving (SRD) through interpolation from GRLWEAP generated bearing graph data and pile driving logs.
  • Batch running of OPILE files can now be performed through the user interface. Batch running allows running a list of defined OPILE files without interruption. The Batch Control also allows running the Reporter to generate output in your selected output template. Batch Control can also be used to only run the Reporter.
  • 200 grid points can now be used for axial, lateral and SRD calculations.
  • When using the CLAYAPI method for the generation of cyclic P-Y curves, the depth to the bottom of the reduced zone (Xr) can now be manually set overriding the automatic calculation.
  • When using the CLAYAPI method for the generation of P-Y curves, the modification in the calculation of Yc proposed by Stevens and Audibert (1979) can now be applied.
  • For mono-piles in sand the KALLEHAVE method based on Kallehave et al. (2012) was added allowing to generate P-Y curves using a nonlinear subgrade reaction modulus with depth
  • For mono-piles in dense sand, the SORENSEN method, based on Sorensen et al. (2010), was added allowing to generate P-Y curves using a nonlinear subgrade reaction modulus with depth for generation of P-Y curves.
  • ALLCAP redesign of screen layout to be more intuitive.
  • ALLCAP now also considers all other axial parameters for analysis, including Friction Multipliers and End Bearing Smoothing.
  • ALLCAP now also presents the End Bearing Capacity for all Replacement Combinations.
  • A separate ‘Clear Output’ button was added.
  • In the AxCap output, numeric output for both smoothed and non-smoothed end bearing pressures are presented in the End Bearing tab.


  • The direct link for downloading the latest version of OPILE is added to the Help File.
  • When using AxCap with a length dependent method, the calculated skin friction follows a more smooth profile at the bottom of the pile (the change in total shaft capacity is expected to be lower than 0.2%).
  • Axial load displacement response: the displacement at peak tension capacity is now better identified when using the CheckBox ‘Locate Axial Response Peaks’. Consequently the automatically generated displacements for Load Case 1 to 8 will be different, as they are derived from the displacement at tension peak capacity. In the previous OPILE versions, the displacement at tension peak capacity was offset by 1′ Displacement Interval’.
  • The Twist Load Case is disabled when the CheckBox ‘Locate Axial Response Peaks’ is checked (the Twist Load Case is not related to the Axial Response Peaks).
  • Improved plotting of Skin Friction and End Bearing when only 1 pile node is present in 1 soil layer, the value is plotted for the whole soil layer (vertical line).
  • Load Displacement analysis: a warning is now shown in the Analysis Notes when an input parameter was ignored (e.g. when both a displacement and a load are defined, displacements take precedence over loads).
  • The output of Axial Analysis is relevant to the bottom of the pile element. A column with “bottom element depth” has been included in the output and the calculation results are now plotted vs. the bottom element depth.
  • ALLCAP: A specific warning is shown in the Analysis Notes when an Axial Soil Input is missing.

Kallehave, D., LeBlanc, C., Liingaard, M.A., 2012. Modification of the API P-Y formulation of initial stiffness of sand, in: Integrated Geotechnologies – Present and Future. Presented at the SUT OSIG, London, pp. 465–472.
Sorensen, S.P.H., Ibsen, L.B., Augustesen, A.H., 2010. Effects of diameter on initial stiffness of p-y curves for large-diameter piles in sand, in: Numerical Methods in Geotechnical Engineering. CRC Press, pp. 907–912.
Stevens, J.B., Audibert, J.M.., 1979. Re-examination of PY curve formulations. Presented at the Offshore Technology Conference, Paper OTC 3402, pp. 397–403.