某核岛地基沉降分析与计算

Settlement Calculation and Analysis of a Nuclear Island Foundation

摘要: 以某核岛地基沉降为例，介绍了核岛沉降计算所依据的核电标准、数值模型、参数取值、计算方法和评价标准，计算表明：地基在卸载和再加载条件下的非线性、地基岩土力学特性的空间变异性、地基地下水位变化的影响以及地基岩土力学参数因开挖、排水和回填而受扰动的几何尺寸和蠕变效应是核岛区地基沉降的影响因素，采用三维有限元法预测的地基沉降值与实际监测资料规律一致，可供类似工程参考。

Abstract: A typical foundation settlement case of nuclear island in a certain nuclear power plant under construction is analyzed. The nuclear power standards, numerical model, mechanical parameters, calculation method and evaluation criteria are detailedly introduced. The calculation results show that: nonlinearity under unloading and reloading, spatial variability of mechanics characteristics, ground water level variation, disturbed zones by the excavation, drainage and backfill, creep effect are foundation settlement factors of nuclear island. The calculation results are in accordance with monitoring data, which can be used as a reference for the similar projects