Static Status and Treatment Solution Study on Sub-Grade with Non-Homogeneous Constituents in Local Area of Nuclear Island Buildings
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摘要: 针对局部非均质、非岩性复杂地基,应用有限元软件ANSYS建立了地基、筏基与上部结构的一体化三维(3D)有限元模型,精确模拟捕虏体的力学特性和空间分布形态,并对捕虏体参数进行了敏感性分析,对地基不均匀沉降、筏基及上部结构内力分布、结构配筋设计等进行了综合评价。分析结果表明,在特定的捕虏体分布状态的情况下,围岩可以承担上部结构传来的荷载,捕虏体的存在对结构设计的适应性不构成影响;用C25素混凝土置换捕虏体时,置换深度为2 m时,筏板的位移值与置换深度的比值最大,经济性相对较好。Abstract: Since there are some weathered accidental inclusion in the sub-grade of a nuclear project in China,an integrative model including the sub-grade,foundation and super-structure were generated using the finite element software ANSYS to assess the influence of these weak rocks.Based on the geological data,the non-homogeneous rock conditions were accurately simulated and the sensitivity analyses to the parameters of weathered accidental inclusion were also carried out.Then the non-homogeneous settlement of the sub-grade rock,the internal force distribution of the raft and super-structure and the structural reinforced design were analyzed in detail,and the results provided a theoretical basis for obtaining the treatment solution of weak rocks.It demonstrated that the weak rocks in the specified limited scale have slight impact on the static capacity of the sub-grade since the surrounding good rocks can support the loads transmitted from the super-structure.The engineering practice also showed the relevant treatment solution is appropriate.
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