Abstract: The large diameter and super-long pile is the development trend of the pile foundation engineering of high standard buildings. But there is few research about its horizontal bearing characteristics. In this paper, the horizontal deformation and stress distribution of the large diameter and super-long pile were obtained by pile test in field of Jingjiang cultural center construction project. The piezocone penetration test (CPTU) p-y curve method was used to construct the numerical model of the large diameter and super-long pile under horizontal loading. After comparison and verification with the results of pile test, the numerical model was used to further study the influence of size effect, embedding types, inclination of pile and vertical loads on the horizontal bearing performance. Finally, the quantitative evaluation about the parameter sensitivity of the large diameter and super-long pile was achieved by calculation of different sensitivity values. The research results show that in-situ CPTU test is a very good application in analysis of horizontal bearing capacity of the large diameter and super-long pile, and the order of sensitivity values is: embedding type, size effect, vertical load, inclination.

Key words: large diameter and super-long bored pile, horizontal bearing capacity, parameter sensitivity, piezocone penetration test(CPTU), p-y curve, lateral load test