论文部分内容阅读
以采用水泥粉煤灰碎石桩(CFG桩)复合地基进行地基处理的核电站为研究对象,探究该地基处理方案在核电厂建设中的使用可行性,建立了基于拟静力法的核电站CFG桩复合地基地震承载力分析模型。对模型施加三向地震动作用,分析复合地基在地震作用下的极限承载力以及极限状态下应力、应变和塑性区的分布特征。由模拟结果可知,CFG桩复合地基的地震承载力基本满足要求,只要适当增大复合地基角桩的截面尺寸,采用CFG桩复合地基方案来处理核电天然厂址是可行的。同时,综合考虑土体变形、CFG桩的失效来判断复合地基的破坏是合理的。
Taking CFG pile composite foundation for foundation treatment as the research object, the feasibility of using the foundation treatment scheme in the construction of NPP is explored. Based on the quasi-static method, the CFG pile Seismic Bearing Capacity Analysis Model of Composite Foundation. Three-dimensional ground motion was applied to the model to analyze the ultimate bearing capacity of composite foundations under earthquake and the distribution characteristics of stress, strain and plastic zone in the ultimate state. The simulation results show that the seismic capacity of the CFG pile composite foundation basically meets the requirements. As long as the section size of the composite foundation pile is properly increased, it is feasible to adopt the CFG pile composite foundation scheme to deal with the natural nuclear site. At the same time, it is reasonable to judge the failure of composite foundation considering the deformation of soil and the failure of CFG piles.