There is generally a physical limit to the smallest possible capacity for a deep foundation. However, a lower bound on the capacity has rarely been accounted for in performing reliability analyses and developing reliability-based design codes. The objectives of this paper are to investigate the effect of having a lower-bound capacity on the reliability of a geotechnical engineering system and to propose a load and resistance factor design (LRFD) checking format that includes information on the lower-bound capacity in design. It is concluded that a lower-bound capacity can cause a significant increase in the calculated reliability for a geotechnical design even if it is an uncertain estimate. Two alternative LRFD formats that incorporate lower-bound capacities and that would not require substantive changes to existing codes are proposed. Real-world examples dealing with the design of onshore and offshore foundations indicate that the incorporation of a lower-bound capacity into design is expected to provide a more realistic quantification of reliability for decision-making purposes and therefore a more rational and efficient basis for design.

https://ascelibrary.org/doi/pdf/10.1061/%28ASCE%29GT.1943-5606.0000044

Importance of Lower-Bound Capacities in the Design of Deep Foundations

The use of augered cast-in-place (ACIP) piles for transportation infrastructure requires an appropriate reliability-based design (RBD) procedure. In an effort to improve the accuracy of an existing...

/pdf/ultimate-limit-state-reliability-based-design-of-augered-4ioianxaiv.pdf

Ultimate limit state reliability-based design of augered cast-in-place piles considering lower-bound capacities

This study proposes a reliability-based design procedure to evaluate the allowable load for augered cast-in-place (ACIP) piles installed in predominately granular soils based on a prescribed level ...

/pdf/serviceability-limit-state-reliability-based-design-of-3yvqqk9264.pdf

Serviceability limit state reliability-based design of augered cast-in-place piles in granular soils

Thixotropy research of laponite-hydrogel composites for water shutoff in horizontal wells

The importance of lower-bound capacities in geotechnical reliability assessments

The paper discusses the application of reliability theory to offshore foundation piles. The theoretical risk of failure for piles is computed for a range of realistic soil and loading conditions. The reliability analyses are updated in the light of long term field experience and the results used to comment on reassessment procedures for foundations. It is concluded that, if standard design procedures are followed, the outcome is likely to be that, generally, piles in sand are more at risk of failure than piles in clay, and piles governed by the dead load condition more at risk than those for which the extreme environmental load governs.

Risk of Foundation Failure of Offshore Jacket Piles

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Risk of Foundation Failure of Offshore Jacket Piles