水平受荷嵌岩桩承载性能的修正模型研究

摘要

Based on the in-situ tests for 5 groups of big -diameter rock -socketed piles under lateral load and the load -deflection curves, we determined the p-y hyperbolic function method as the horizontal bearing capacity criterion of a series of the load tests, and determined the ultimate bearing capacities of test piles. According to different calculation theories of horizontal bearing capacity, such as Zhang method, Kulhawy method and Reese method, we calculated the horizontal bearing capacities of load tests, and compared with the true bearing capacity analyzed by the criterion. The results show that the Kulhawy method is more suitable for calculating horizontal bearing capacity of rock-socketed piles. The Kulhawy calculation model was modified and the modified calculation model was verified with these load test parameters. Error analysis of these methods was given and a comparison was made. The results show that the calculation results of the modified Kulhawy calculation model are closer to the true values of horizontal bearing capacity.%基于5组大直径嵌岩桩水平受荷现场试验及荷载-位移图,确定p-y双曲线函数法作为文章一系列荷载试验的水平承载力判别准则,从而确定试桩的极限水平承载力.采用Zhang法、Kulhawy法、Reese法三种水平承载力计算理论对荷载试验的水平承载力进行计算,将计算结果和准则判别的真实承载力比较.结果表明,Kulhawy法的解答更适合计算嵌岩桩的水平承载力.修正了Kulhawy计算模型,对系列试验再次进行了修正计算,对上述几类模型的计算结果进行误差分析与比较.结果表明,修正的Kulhawy计算模型解答更接近水平荷载试验的真实承载力值.