Evaluation of CPT-based ultimate lateral pile resistance in sand
The CPT-qc has been used quite successfully to estimate the shaft friction fs along vertically loaded piles. This prompts the question of how to use the qc to estimate the ultimate laterally loaded pile resistance pu, as the correlation between qc and pu is not as strong as that between qc and fs. In this paper, modulus of subgrade reaction k and the pu 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 pu. The deduced values of k and pu are consistent with those gained previously for 57 lateral piles. Particularly, the gradient of pu over qc_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 qc and pu.
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