摘要
吊脚桩是岩石埋深较浅地区普遍采用的一种基坑支护结构,基坑内岩石爆破开挖会对其安全造成影响。根据岩石中爆破荷载的传播特性和衰减规律,确定简化爆破荷载及其作用位置,建立了一种简化计算方法,从而可以基于有限元模拟爆破荷载对吊脚桩的振动影响。通过对吊脚桩桩身各点振速峰值分析,并考虑不同爆破装药量、桩径、锚索预应力的影响,得到了吊脚桩抗爆响应规律,从而为吊脚桩设计及施工提供参考。
End suspended piles are widely applied to excavation supporting in areas where the rock masses are shallowburied,however,they might be easily damaged during the blasting excavation.In this paper,a simplified method is proposed based on the propagation characteristics of blast load in rock masses,it requires an equivalent blast load on the boundary of crushing zone.By taking different factors into consideration,including the charge,the diameter of end suspended pile and the pre-stress of cables,the response of end suspended piles subjected to blast vibration is studied.This method could be applied to relevant projects.
出处
《城市轨道交通研究》
北大核心
2014年第3期70-74,共5页
Urban Mass Transit
关键词
基坑支护
吊脚桩
爆破影响
数值模拟
foundation pit support
end suspended pile
blasting effect
numerical simulation
