Field test of lateral static loading of rock-socketed monopiles and study of p-y curve

In order to study the load response and p-y curve pattern of rock-socketed monopiles under weathered granite geological conditions, a study on the load-displacement relationship, bending moment, pile deformation and p-y curve response of rock-socketed monopiles under horizontal static load was carried out based on field tests. The tests show that: in the relative depth range studied, the geotechnical resistance and the corresponding displacement decrease as z / D increases, and it is difficult to transfer the upper load to the deeper rock layers; the maximum pile bending moment is between 3-4 times the pile diameter, and the ultimate load depends mainly on the pile strength rather than the rock. For a more accurate assessment of the p-y curve model's applicability in the weathered granite foundation, the general hyperbolic function and hyperbolic tangent function were used to fit the data. Using a broad hyperbolic function yields better fits for data in the shallower part of the domain while yielding more discrete results for data in the deeper part of the domain. It is recommended to utilise the hyperbolic tangent function to improve the fit at each level. The analysis results simplify the prediction program of field p-y curve. © 2024 Editorial Board of Journal of Harbin Engineering. All rights reserved.