针对我国核岛厂房建设尚没有采用桩基础的现状,以某拟建核电厂嵌岩桩加固后的软土地基为研究对象,采用滑面应力法确定地基天然承载力,采用等效线性法描述近场地基非线性特征,粘性人工边界模拟辐射阻尼效应及考虑桩土效应影响的节点耦合,建立了桩-土-结构动力相互作用模型,并通过有限元分析计算得到静力、地震作用下桩体内力分布,给出满足抗震承载力要求的配筋方案。研究结果可为类似条件下的核岛厂房软土地基处理方案的抗震设计提供借鉴与参考。
In view of the status that no use of pile foundation in the nuclear power plant in China,taking the soft soil ground of the reinforced rock-socketed piles of a planned nuclear power plant as research subject,we determined the natural bearing capacity of the ground by the slip surface stress analysis method. Considering the nonlinearity characteristic of the near-field foundation of the model by using the equivalent linearization method,the radiation damping effect simulated by the viscous artificial boundary,and the interaction of pile and soil is considered by the way of node coupled,we set up the model of pile-soil-structure dynamic interaction. Based on the above model,we calculated the internal force of piles under static force and earthquake through the finite element analysis,and then got the reinforced distributing which meets the requirement of seismic bearing capacity. The obtained study results can provide the reference for the seismic design of foundation treatment scheme of nuclear power plant in the similar conditions.
