14. Effect of time and maintained load on the ultimate capacity of piles in stiff clay
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Published:1992
I. F. Wardle, G. Price, T. J. Freeman, 1992. "14. Effect of time and maintained load on the ultimate capacity of piles in stiff clay", Piling European practice and worldwide trends: Proceedings of a conference organized by the Institution of Civil Engineers, and held in London on 7–9 April 1992, Institution of Civil Engineers
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Constant rate of penetration (CRP) loading tests were carried out at a London Clay site on four instrumented 170 mm diameter piles over a period of three years to investigate the effect of elapsed time and maintained load on the ultimate bearing capacity. Two of the piles were jacked-in, one driven and the fourth cast-in-place. The results show that, while there was a significant increase in capacity for all the piles due to the passage of time, no additional increase was obtained by applying maintained loads. Short-term increases in capacity of up to 28% were recorded between installation and the first CRP tests, and total long-term increases were in the range 37 to 48%.
INTRODUCTION
TEST SITE
TEST EQUIPMENT
TEST PROCEDURE
RESULTS
DISCUSSION OF TEST RESULTS
CONCLUSIONS
REFERENCES
