Abstract
Piles provide a convenient solution for heavy structures, where the foundation soil bearing capacity, or the tolerable settlement may be exceeded due to the applied loads. In cohesionless soils, the two frequently used pile installation methods are driving and drilling (or boring). This paper reviews the results of a large database of pile load tests of driven and drilled piles in cohesionless soils at various locations worldwide. The load test results are compared with the static analysis design method for single piles recommended in the Canadian Foundation Engineering Manual (CFEM) and other codes and standards such as the American Association of State Highway and Transportation Officials, Federal Highway Administration, American Petroleum Institute, Eurocode, and the Naval Facilities Engineering Command. An improved pile design procedure is proposed linking the pile design coefficients (β) and (Nt) to the friction angle of the soil, rather than employing the generalized soil type grouping scheme previously used in the CFEM. This improvement included in the new version of the CFEM 2021 produces a more unified value of the pile capacity calculated by different designers, reducing the obtained design capacity discrepancies.
Highlights
This improvement included in the new version of the Canadian Foundation Engineering Manual (CFEM) 2021 produces a more unified value of the pile capacity calculated by different designers, reducing the obtained design capacity discrepancies
This paper evaluates the approach used in the CFEM for driven and drilled piles in cohesionless soils using a large database of pile load tests
An improved pile design procedure is proposed linking the pile design coefficients ( β) and ( Nt ) to the friction angle of the soil, rather than employing the generalized soil type grouping scheme previously used in the current CFEM method
Summary
The design of deep foundations is often based on a combination of experience and empiricism [1]. The ultimate pile capacities obtained using the CFEM method is compared with the results of other theoretical methods such as the standards of the American Association of State. The paper considers three definitions of pile capacity evaluation from pile load tests to determine the actual ultimate pile load based on the load-displacement relationship obtained from each pile load test: namely, the Hansen 80% [22], Chin-Kondner [23,24], and the Decourt [25] methods. An improved pile design procedure is proposed linking the pile design coefficients ( β) and ( Nt ) to the friction angle of the soil, rather than employing the generalized soil type grouping scheme previously used in the CFEM This improvement shall produce a more unified value of the pile capacity calculated by different designers, reducing the obtained design capacity discrepancies
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call