2019 Chicago Geotechnical Lecture Series
Click the link below for presentation slides, photos, and other information from the 2019 Chicago Geotechnical Lecture Series hosted by the ASCE Geo-Institute Chicago Chapter on May 10, 2019:
Excel Spreadsheets for Screw Pile Calculations
The spreadsheet below calculates the installation torque for a single-helix pile in clay according the formula given by Hambleton and Stanier (2019). The formula is modified to allow for axial (crowd) force on the plate to become negative, which occurs when the applied crowd force is insufficient to overcome axial force mobilized along the shaft.
This spreadsheet can be used to compute undrained shear strength for measured values of torque:
Citation details and links to the associated papers are provided below.
Hambleton, J.P., and Stanier, S.A. (2019). Linking the installation response of screw piles to soil strength and ultimate capacity. Proc. 44th Annual Conference on Deep Foundations, Chicago, October 15-18, pp. 638-647.