Technical Papers

File Description
3rd C.F.P.B. BEST Loading Test Data and Analysis
(1.8 MB - zip)
A complete analysis of three of the tests (Pile A3 HD, Pile B2 HD, and Pile F1 BD) and a paper describing the arrangement of the static loading tests performed for the 3rd International Conference on Deep Foundations, Bolivia, April 2017.
Unified Design Procedure
(659 KB - pdf)
Example of the Unified Design procedure by B.H. Fellenius.
Pile Capacity from CPT
(1,300 KB - pdf)
The cone penetrometer test, CPT and CPTu, and its use for determining pile capacity. Several methods employed in current engineering practice are discussed, compared, and applied to a series of case histories. Amongst them, a new method proposed by A. Eslami and B.H. Fellenius. Canadian Geotechnical Journal article.
Soil Profile from CPT
(618 KB - pdf)
Soil profile interpreted from CPTu data. A paper presenting soil profiling methods using the Cone Penetrometer, CPT and CPTu.
Dragload-Downdrag Discussion on Poulus
(24 KB - pdf)
Asian Journal Discussion on the design for dragload and downdrag (settlement) on piles with recommendation summary.
(861 KB - pdf)
The basics of the Fellenius Unified Pile Design of Capacity, Negative Skin Friction (Dragload and Downdrag), and Settlement. The approach is applied to a case study involving 100 ft to 190 ft long piles and is also a demonstration of the use of UniPile in an engineering project. Paper presented to a New York ASCE seminar in April 1998. The paper quotes several important case histories from the literature.
Compressibility and Modulus Number
(102 KB - zip)
Determining compressibility parameters (C-c, CR, and Janbu Modulus Number, m) from oedometer tests. An EXCEL spreadsheet template that is particularly useful to users of the UniPile and UniSettle software.
Downdrag Discussion
(131 KB - pdf)
Asian Journal Discussion on the analysis of dragload and downdrag on piles and comparison of two approaches to the calculation of downdrag (settlement).
Residual Load Analysis
(310 KB - pdf)
A two-part article published in Geotechnical News Magazine. The first part presents aspects of evaluation of strain-gages in instrumented piles with notes on Shift-of-No-Load-Reading and influence of Residual Loads. The second part describes in detail and with examples how to analyze the test data and detrmine the magnitude and distribution of residual load and true resistance.
(1.2 MB - zip)
An Excel (.xlsx) file developed by Dr. Fellenius containing 8 worksheets with information that is useful when working with the UniSoft programs, such as strength and density classifications, compressibility conversions (conventional <--> Janbu), phase relations (density, water content, void ratio, unique weight), and plot of CPT/CPTu classifications charts (Eslami-Fellenius, Robertson+Campanella, Robertson).

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