横向荷载作用下扩底桩弯曲破坏性状分析

扩底桩因其承载能力强而越来越多地应用于工程实践中,对扩底桩的研究多集中在竖向荷载作用下的工作性状研究,承受横向荷载作用的扩底桩受力性能研究较少。对大尺寸、承载力强的扩底桩开展原型破坏试验非常困难,而模型试验可以在有限试验条件下模拟原型试验的真实试验过程。本文通过对扩底桩进行横向逐级加载模型试验,得到扩底桩在横向加载作用下桩顶位移、桩身应力、桩侧土抗力、桩底土压力的变化规律以及弯曲破坏时桩体的破坏形态,并对其承载性能进行分析和总结。模型试验得到的扩底桩在横向受荷作用下呈现的承载性能规律和破坏形式可以为今后扩底桩的横向受力机理研究和应用提供依据和参考。

Character Analysis on Belled Pile under Transverse Load with Bending Failure

Because of the strong bearing capacity of belled pile,the belled pile is more and more applied in in the actual projects.Most research focuses on the behavior of belled pile under vertical load,while the research on transverse load is few.It is very difficult to carry out prototype destruction test on belled pile of large size and strong bearing capacity,and the model test can simulate the real test process of prototype belled pile under limited test conditions.In this paper,according to the transverse step loading model test of belled pile,the change rules such as displacement of pile top,stress of pile body,soil resistance at pile side,soil pressure at pile bottom and the bending failure mode under transverse load are obtained,the bearing characteristics of belled pile under transverse load are analyzed and summarized comprehensively.The bearing capacity law and failure pattern of the belled pile can provide basis and reference for the study and application of the belled pile transverse bearing mechanism in the future.