UniPile is an application for the design of piles and pile groups using beta-method, alpha-method, – separately or in combination – or SPT/CPT/CPTu methods: Eslami and Fellenius (CPTu), Schmertmann and Nottingham (CPT), deRuiter & Beringen (Dutch CPT), Bustamente (LCPC CPT), Decourt (SPT), O’Neill-Reese (SPT), and Meyerhof (SPT). UniPile considers bearing capacity, residual load, pile group settlement, negative skin friction, drag force, and downdrag. Aspects of drivability for input to WEAP is also included. It also simulates the load-movement response of a test pile in a static loading test performed by a conventional head-down test or bidirectional test (O-Cell).

All results are presented in tabular and graphical form that can be exported to Excel format or tab-delimited text format for further manipulation and reporting. All input and results may be entered in either Customary US or SI units and be toggled back-and-forth at any time.

Soil and Pile Data

Soil and Pile Data

All input data are presented and edited using an Excel-type grid and cell system. UniPile 5.0 can have up to 25 soil layers. Soil strength parameters, soil compressibility, as well as pore pressures, can differ from layer to layer and within each layer.

UniPile accepts piles of all types, shapes, and sizes including driven piles and drilled-shafts.

Loads and Excavations

Stress changes due to load can be from a combination of point, line, circular, triangular, rectangular, polygon, or embankment with sloping sides.

Stress distribution is calculated according to Boussinesq, Westergaard, or 2(V):1(H) methods and combines the effects of loading and unloading.

Loads and Excavations
Pile Capacity

Pile Capacity

UniPile 5.0 calculates pile resistance according to beta (effective stress), alpha (total stress), SPT, CPT, or CPTU methods. Calculation results (neutral plane, drag force, transition zone, and shaft resistances), are presented in tables and graphs. The results include input for WEAP bearing graph and drivability analyses.

Pile Settlement

Settlement of single piles or small pile groups is determined using conventional Cc-e0 approach, E-modulus, or Janbu tangent modulus methods as applicable to each individual soil layer. Distribution of pile compression and ground settlement are also computed and presented in tables and graphs.

Pile Settlement

Loading Test Simulation

The load-movement response of a pile in a static and bidirectional loading test can be simulated by choosing appropriate t-z functions for each soil layer and a q-z function for the pile toe, such as Hyperbolic, Ratio, Hansen-80%, Zhang, and Exponential, or User Defined. The simulation is particularly useful when back-calculating results of a static loading test.