基于动力响应特性的锚索抗滑桩抗震性能评估方法

The anchored stabilizing pile that is used to govern the accumulation landslide is taken as the object in this research. To avoid the deficiencies in current seismic design methodology, especially that in pseudo-static method and sliding block analysis, the space-time dynamic response characteristics will be taken as the principal clue, and then a nonlinear dynamic equation considering pile – anchor - soil interaction can be established as medium process. Through shaking table test, theoretical analysis, numerical analysis and the Hilbert-Huang Transform technology etc., the objective of this research is to explore the movement mechanism of reinforced slope and seismic performance of structure in accumulation slope with anchored stabilizing pile under ground motion. Considering the spatial inconsistencies of the slope movement and the temporal inconsistencies of the characteristics of ground motions, and the permanent displacement and performance features, an approach of seismic performance evaluation of anchored stabilizing pile based on spatial and temporal inconsistent dynamic response characteristics can be established. The proposed approach provides a new idea for safe, economical and rational seismic design of accumulation slope engineering in seismic zones, and hopefully promotes the theory development of seismic performance-based seismic design for flexible cantilever retaining structure.

本课题以治理堆积体滑坡的锚索抗滑桩为研究对象，针对现行抗震设计方法中存在的缺陷，特别是拟静力法和滑块位移法中存在的缺陷，以研究加固边坡时空的动力响应特性为主线，以桩-锚-土耦合的非线性动力方程为桥梁，采用振动台试验、理论分析、数值分析和希尔伯特-黄变换技术等为手段，旨在探明地震作用下锚索抗滑桩加固堆积体边坡的运动机制和结构性态特征，突破传统支挡结构抗震设计的瓶颈，考虑加固边坡运动空间的不一致性和地震动特征在时间上的不一致性，建立一套基于加固边坡时空非一致动力响应特性，统筹兼顾结构永久位移和性态特征两大指标的锚索抗滑桩抗震性能评估方法，为地震区堆积体边坡工程的安全、经济、合理的抗震设计提供新思路，冀望对柔性悬臂支挡结构抗震性能理论的发展有所贡献。

本课题以治理堆积体滑坡的锚索抗滑桩为研究对象，针对现行抗震设计方法中存在的缺陷，特别是拟静力法和滑块位移法中存在的缺陷，研究了加固边坡时空的动力响应特性，并以此为主线，通过建立的桩-锚-土耦合的非线性动力方程为桥梁，采用振动台试验、理论分析、数值分析和希尔伯特-黄变换技术等手段，探明了地震作用下锚索抗滑桩加固堆积体边坡的运动机制和结构性态特征，考虑加固边坡运动空间的不一致性和地震动特征在时间上的不一致性，建立了一套基于加固边坡时空非一致动力响应特性，统筹兼顾结构永久位移和性态特征两大指标的锚索抗滑桩抗震性能评估方法，为地震区堆积体边坡工程的安全、经济、合理的抗震设计提供了新思路。