基于土体液化造成桥梁桩基屈曲失稳的震害事实，针对液化侧扩流场地桩基屈曲失稳防控设计规范缺失的问题，本项目以倾斜液化场地嵌岩桩为研究对象，采用试验方法、理论分析、数值模拟与震害调查相结合的研究手段，探究侧向荷载（土体液化流动土压力和上部结构惯性荷载）和轴向荷载耦合作用下桩基地震反应规律，突出液化流动土压力对桩基屈曲失稳的影响效应，致力于桩基屈曲失稳的有效防控，聚焦提出桩基屈曲稳定分析计算模型，精准识别桩基屈曲失稳主控因素，力求构建便于工程应用的液化侧扩流场地桥梁桩基屈曲失稳判别方法。这对于客观认识桥梁桩基地震反应规律与屈曲失稳机理，精准分析桥梁桩基稳定性，科学完善现行液化侧扩流场地桥梁桩基抗震设计规范，有效实施桥梁桩基抗震设计等，具有重要理论和现实意义。

Soil liquefaction has caused buckling instability to bridge pile foundation in past earthquakes, and the seismic design code for buckling instability of pile in liquefiable soils is still in shortage. This project takes the rock-socketed pile which is subjected to liquefaction-induced lateral spreading as the research object. Model tests, theoretical analysis, numerical simulation, and earthquake damage surveys will be adopted to study the seismic behavior of pile under the combination action of lateral and axial load. This project mainly concerns the effect of lateral spreading on the buckling instability of pile and proposes a calculation model for the buckling stability analysis of pile. Moreover, parameter studies will be performed to identify the key parameter affecting the pile buckling behavior. Finally, a discriminant method for buckling instability of pile subjected to liquefaction-induced lateral spreading is proposed for engineering design. The study would greatly help improve the understanding of buckling failure mechanism and accurately predict the buckling instability for bridge pile foundation under strong earthquakes. It also aims to enhance the seismic design code for the pile, which is significant in engineering practice as well as in theory research.