Axial load transfer behavior of rock-socketed shafts

Lianyang Zhang, Jinming Xu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

In the design of rock-socketed shafts for supporting axial loading, the end bearing resistance is often ignored, resulting in excessive rock-socket lengths and increased cost. This paper investigates the axial load transfer behavior of rock-socketed shafts based on a database of 99 field test rock-socketed shafts. The shafts are 1.4 to 96.3 m long and have a diameter between 0.5 and 1.5 m. The rock-socket lengths are from 0 to 18.8 meters. The database is developed by collecting information on field test rocksocketed shafts from published papers and reports. The results show that it is important to account for the end bearing resistance in the design of rock-socketed shafts because (1) up to 25% of the shaft head load on average can be transmitted to and supported by the shaft base even at relatively small shaft head displacement in the working range of 5-15 mm, and (2) the portion of the shaft head load transmitted to and supported by the shaft base increases with time due to the effect of creep.

Original languageEnglish (US)
Title of host publicationGeotechnical Special Publication
Pages175-182
Number of pages8
Edition185
DOIs
Publication statusPublished - 2009
EventContemporary Topics in Deep Foundations - 2009 International Foundation Congress and Equipment Expo - Orlando, FL, United States
Duration: Mar 15 2009Mar 19 2009

Other

OtherContemporary Topics in Deep Foundations - 2009 International Foundation Congress and Equipment Expo
CountryUnited States
CityOrlando, FL
Period3/15/093/19/09

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ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Civil and Structural Engineering

Cite this

Zhang, L., & Xu, J. (2009). Axial load transfer behavior of rock-socketed shafts. In Geotechnical Special Publication (185 ed., pp. 175-182) https://doi.org/10.1061/41021(335)22