地震作用下桩板墙组合支挡结构性状实验对比分析

Experimental Comparative Analysis of Pile-Board Wall Composite Retaining Structure under Earthquake Action

摘要: 随着近年来铁路建设越来越重视既有线的二次开发利用，对于既有线的扩建和改建项目逐渐增多，在原有路基挡土结构的基础上新建支挡结构进行路基帮宽可以满足既有线改建扩建的要求并且最大程度利用既有线原有支挡结构。目前对于地震荷载影响下组合支挡结构的形式及其支挡效果尚缺少深入研究，因此本文通过改变加速度峰值以及设置变桩墙距、变桩间距共十种工况的模型试验对重力式挡土墙与桩板组合支挡结构土压力进行研究，得出静力状态和不同加速度峰值地震力作用桩前后土压力分布和桩体位移的一些规律，为今后桩板墙组合支挡结构的抗震设计提供参考。

Abstract: With the increasing emphasis on the secondary development and utilization of existing lines in railway construction in recent years, the expansion and reconstruction projects of existing lines have gradually increased. On the basis of the original subgrade retaining structure, the new retaining structure for subgrade widening can meet the requirements of the reconstruction and expansion of existing lines and make the best use of the original retaining structure of existing lines. At present, there is still a lack of in-depth research on the form and supporting effect of composite retaining structure under the influence of seismic load. Therefore, this paper studies the earth pressure of gravity retaining wall and pile-plank composite retaining structure by changing the peak acceleration and setting ten kinds of model tests of variable pile wall distance and variable pile spacing. Some laws of earth pressure distribution and pile displacement before and after piles under static state and seismic force with different acceleration peaks are obtained, which provides reference for the seismic design of pile-plank composite retaining structure in the future.