新型EPS抗滑桩的研发及大型振动台对比试验研究

抗滑桩是一种在治理地质灾害中常用的工程手段，广泛应用于铁路、公路、水利等工程领域，而这种抗滑结构的抗震问题也越来越引起工程师的重视，如何提高支挡结构的抗震性能已成为工程界的一个重要研究方向。目前，在工程中通过加入EPS柔性材料来提高工程的抗震性能已引起工程界的重视并取得良好的效果。基于此，为了提高和满足抗滑桩在工程领域的抗震性能要求，特将EPS材料用于抗滑桩，研发了新型抗滑桩EPS桩。通过振动台试验对比研究了EPS桩与普通抗滑桩的动力响应和抗震性能。试验得出以下结论：（1）不同的地震波，其加速度放大效应不同；输入EL地震波的峰值加速度越大，加速度放大效应越明显。（2）相同峰值加速地震波作用下，普通抗滑桩加速度放大效应比EPS桩更显著。（3）桩头倾角及放大系数表明，EPS抗滑桩具有更好的抗震性能表现，且在双向振动时EPS材料在极震工况下对抗滑桩桩身动土压力改善明显。（4）在本次试验中发现，随着地震波峰值加速的增大，滑面裂缝向深层扩展，可能诱发深层滑动。

RESEARCH ON NEW TYPE EPS ANTI-SLIDE PILE AND LARGE-SCALE SHAKING TABLE CONTRAST TEST

Anti-sliding pile is a common engineering method in treatment of geological hazards, which is widely used in rail, road, and water conservancy engineering. And engineer pay more and more attention to the seismic problem of this anti-slide structure, it has already been an important research direction to study how to improve the seismic performance of retaining structures. Currently, it has caught the engineers' attention and achieved good results to improve the seismic performance by adding EPS flexible materials to engineering. Based on this, in order to improve and meet seismic performance request of anti-sliding pile in engineering, EPS material is applied to anti-sliding and a new anti-sliding is designed called EPS pile. By shaking table test, the dynamic response and seismic performance of EPS pile and ordinary pile indoor are researched and compared. Conclusions could be drawn from trail that:(1) the acceleration magnified effect is different with different seismic waves; with more lager EL seismic peak acceleration, the more obvious of acceleration magnified effect; (2) the acceleration magnified effect of ordinary pile is more obvious than of EPS pile under the same peak acceleration of seismic wave.(3) Pile head angle and acceleration magnified effect show that: EPS anti-sliding has better seismic performance; EPS material can clearly improve the passive earth pressure of anti-sliding pile under pole shaking condition and Bi-directional vibration.(4) Besides, it can be found in this experimental that sliding surface cracks to the deep extension and may induce deep sliding with the increase of seismic wave speed.