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 publicationContemporary Topics in Deep Foundations - Proceedings of Selected Papers of the 2009 International Foundation Congress and Equipment Expo
Pages175-182
Number of pages8
Edition185
DOIs
StatePublished - Sep 11 2009
EventContemporary Topics in Deep Foundations - 2009 International Foundation Congress and Equipment Expo - Orlando, FL, United States
Duration: Mar 15 2009Mar 19 2009

Publication series

NameGeotechnical Special Publication
Number185
ISSN (Print)0895-0563

Other

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

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

Fingerprint Dive into the research topics of 'Axial load transfer behavior of rock-socketed shafts'. Together they form a unique fingerprint.

  • Cite this

    Zhang, L., & Xu, J. (2009). Axial load transfer behavior of rock-socketed shafts. In Contemporary Topics in Deep Foundations - Proceedings of Selected Papers of the 2009 International Foundation Congress and Equipment Expo (185 ed., pp. 175-182). (Geotechnical Special Publication; No. 185). https://doi.org/10.1061/41021(335)22