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抗滑桩加固陡坡桥基振动台试验研究
周珩,苏谦,刘杰,越斐
Author NameAffiliationE-mail
Zhou Heng Southwest Jiaotong University zhouhengdxh@163.com 
Su Qian Southwest Jiaotong University  
Liu Jie Southwest Jiaotong University  
Yue Fei Southwest Jiaotong University  
摘要:
基于成兰铁路工程陡坡桥基抗震加固的需求,设计完成了抗滑桩防护滑坡段桥基的振动台模型试验。通过加载不同加速度峰值的汶川地震波,分析了桥梁桩基与抗滑桩的受力与变形特征,探讨了滑坡破坏模式。试验结果表明,在地震过程中,桥梁桩基与抗滑桩动力响应特性受地震加速度峰值的影响,当地震加速度峰值增大时结构受力与变形均增大;抗滑桩的动土压力与动弯矩极值均位于滑动面附近,桥梁桩动土压力与动弯矩极值均位于桩顶处,在结构抗震设计时应根据结构动力响应特征进行局部加固;抗滑桩有效的阻止了滑坡的滑动,桥前坡体以浅层滑动为主,并且在坡脚处存在粗颗粒堆积现象。
关键词:  振动台模型试验  抗滑桩  桥梁桩基  动力响应  破坏特性
DOI:
分类号:
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
SHAKING TABLE TESTS ON BRIDGE FOUNDATION REINFORCED BY ANTI-SLIDE PILES ON SLOPE
Zhou Heng,Su Qian,Liu Jie,Yue Fei
Abstract:
Based on the requirement of seismic reinforcement of bridge foundation on slope in Chengdu-Lanzhou railway project, a sharking table model test of anti-slide pile protecting bridge foundation in landslide section is designed and completed. By applying Wenchuan seismic waves with different acceleration peaks, the stress and deformation characteristics of bridge pile foundation and anti-slide pile are analyzed, and the failure mode is discussed. Results show that the dynamic response of bridge pile and anti-slide pile are affected by the peak value of seismic acceleration of earthquake, with which the stress and deformation of the structure increase. The maximum dynamic earth pressure and the moment of anti-slide piles are located near the sliding surface, while that of bridge piles are located at the top of the pile. Based on the dynamic response of structure, local reinforcement needs to be carried out to meet the requirement of the seismic design. When the slope failure occurs, the tension cracks are mainly produced in the shallow sliding zone and the coarse particles at the foot of the slope are accumulated.
Key words:  Shaking table test  Anti-slide pile  Bridge pile foundation  Dynamic response  Damage mode