级配砂石地基条件下核安全级廊道结构地震响应分析

级配砂石处理核安全级廊道结构的软弱地基有良好的发展前景,发展级配砂石地基条件下的廊道地震响应分析模型是评价其抗震安全性的关键问题。以某核电厂废液输送机排放廊道为研究对象,通过引入等价线性法描述近场级配砂石地基的非线性特征,在分析模型底部施加黏性边界模拟半无限空间,在截断边界的两侧施加黏性边界考虑波动的逸散效果,通过无厚度Goodman单元模拟廊道结构与周围地基的摩擦效应,并利用基于有限元法的自由场响应分析实现地震动输入,从而建立了级配砂石地基条件核安全级廊道结构地震响应分析计算模型。最后,通过开展级配砂石与回填素混凝土两种地基处理条件的廊道地震响应对比分析,该模型表现出良好的规律性及工程应用效果。研究成果可为在建项目、后续核电项目此类问题的地基处理提供借鉴与参考。

Seismic response analysis of nuclear safety class gallery structure under grading sand foundation condition

The graded sand gravel has a good prospect for dealing with the soft foundation of the nuclear safety grade corridor structure.The analysis of the corridor seismic response model under the condition of graded gravel foundation is the key to evaluate the seismic safety of the tunnel.In this paper,a nuclear power plant waste discharge conveyor corridor as the research object,by introducing the equivalent linear method to describe the nearfield nonlinear characteristics of graded sand gravel foundation,the analysis model is applied to the bottom of the viscous boundary simulation of semi-infinite space,energy is applied on both sides of the truncated boundary transfer boundary considering the wave dissipation effect,by simulating the friction effect of corridor structure and ground zero thickness Goodman element,and the use of free field finite element method for response analysis of seismic input based on which analysis model is established to calculate the seismic response of graded sand gravel foundation conditions of nuclear safety corridor structure.Finally,the seismic response analysis of the corridor with gravel and reclaimed concrete is carried out.The model shows good regularity and engineering application effect.The research results can provide reference and reference for the foundation treatment of the project under construction and follow-up nuclear power project.