Evaluation of CPT-based ultimate lateral pile resistance in sand

Authors

Hongyu Qin, Flinders University
Wei Dong Guo, University of WollongongFollow

RIS ID

112868

Publication Details

Qin, H. Y. & Guo, W. D. (2016). Evaluation of CPT-based ultimate lateral pile resistance in sand. In B. M. Lehane, H. E. Acosta-Martinez & R. Kelly (Eds.), Geotechnical and Geophysical Site Characterisation 5 ISC'5: Proceedings of the 5th International Conference on Geotechnical and Geophysical Site Characterisation 5. Volume 2 (pp. 1265-1270). St Ives, Australia: Australian Geomechanics Society.

Link to publisher version (URL)

Australian Geomechanics Society

Abstract

The CPT-q_c has been used quite successfully to estimate the shaft friction f_s along vertically loaded piles. This prompts the question of how to use the q_c to estimate the ultimate laterally loaded pile resistance p_u, as the correlation between qc and pu is not as strong as that between q_c and f_s. In this paper, modulus of subgrade reaction k and the p_u profile were deduced using closed-form solutions and measured response of eight laterally loaded rigid piles tested in-situ and in 1g model tank, respectively. A good comparison is made for each test using a constant k and linear increasing p_u. The deduced values of k and p_u are consistent with those gained previously for 57 lateral piles. Particularly, the gradient of p_u over q_{c_average} for the short piles is equal to (1.8 - 8.8)%, which is only a fraction of other suggestions. This difference necessitates further study on the correlation between q_c and p_u.