强震带厚砂层地层基础桩振动力影响分析

Impact Analysis on Vibration Force of Fundamental Pile in Thick Sand Stratum of Pleistoseismic Zone

本文以昆明南站为例,对强震带厚砂层地区基础桩进行了地震效应分析,采用数值模拟的方法,以无荷载+地震工况下的桩体动力响应与无荷载+无地震工况下的情况对比,通过分析桩身内力和桩体位移,研究了厚砂层地区地震作用对基础桩的影响,发现在地震动力作用下,桩体及桩周土岩的应力增幅高达几十倍甚至上百倍,表明在厚砂层地区桩体对地震动力响应效果明显,为今后该地层条件下桩基础设计施工提供参考。

Taking the Kunming South Station as an example, this paper analyzed the seismic effect of fundamental pile in thick Sand stratum of pleistoseismic zone. By using the numerical simulation method, the dynamic response of pile body under no load ＋ seismic condition was compared with that of no load ＋ no seismic condition. Through analyzing the internal force of pile shaft and displacement of Pile body, the impact of earthquake action on fundamental pile in thick sand area was studied. It found that the stress amplification of soil rock around the pile was up to dozens of times or even hundreds of times. The results showed that the effect of pile on seismic dynamic response was obvious in thick sand area, it could provide a reference for the design and construction of pile foundation under similar conditions in the future.