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EPR核电厂循环水泵房(HPX)给循环冷却水(CRF)系统供水,为抗震Ⅰ类物项,厂址地基中非均质特性的影响尤为重要。以国内某核电厂实际厂址条件为背景,基于ANSYS分析平台建立了泵房-地基三维有限元整体计算模型,细致模拟捕虏体的力学特性和空间分布形态,并提出基于隐式Newmark的静动力时程分析法,对地基竖向变形及承载能力,基础底面接地率、抗滑和抗倾覆稳定性以及泵房主应力分布等进行了综合评价。计算结果表明,在该厂址实际的分布状态情况下,捕虏体的存在对泵房地基的安全性影响较小,局部压应力超标不影响整体稳定性,所评价指标均能满足规范要求,不需要进行地基处理措施,也验证了所建立静动力联合分析模型的可靠性及良好的工程适用性,结合ANSYS软件丰富的单元模型及非线性分析能力,该模型具有解决复杂核电结构非线性动力问题的潜力。
EPR nuclear power plant circulating water pump (HPX) to the circulating cooling water (CRF) system of water supply for the seismic class I items, the impact of the site of the heterogeneity of the foundation is particularly important. Based on the actual site conditions of a nuclear power plant in China, a three-dimensional finite element model of pump house-foundation was established based on the ANSYS analysis platform. The mechanics characteristics and spatial distribution patterns of xenoliths were carefully simulated. Static and dynamic forces based on implicit Newmark Time-history analysis method is used to evaluate the vertical deformation and load carrying capacity of foundation, ground contact rate of foundation bottom, stability of anti-slip and anti-overturning and main stress distribution of pump house. The calculation results show that under the actual distribution condition of the site, the existence of xenoliths has little effect on the safety of the pumping station foundation. Exceeding the local compressive stress does not affect the overall stability, and the evaluation indexes can meet the requirements of the code. The foundation treatment measures need to be carried out and the reliability and good engineering applicability of the established static-dynamic joint analysis model are also verified. Combined with the rich element model and nonlinear analysis capability of ANSYS software, the model has the advantages of solving the nonlinear dynamic problem of complex nuclear power structures potential.