数值模拟在群桩基础评判标准确定中的应用

Application of Numerical Simulation in Pile Group Foundation Evaluation Standard Determination

群桩基础安全稳定性评判决策中各因子评判标准边界的确定是保证其模型正确构建的关键环节。由于安全监测系统无法测得这种警戒值,因此,本文采用基于ABAQUS软件的数值模拟方法,依据上部结构受力特点及使用要求来确定群桩基础安全稳定性判别决策因子的警戒值。仿真结果显示:该方法能可靠获取超大型深水群桩基础成桥后的基桩轴力不均匀性和差异沉降的最佳警戒值。

The determination of evaluation standard boundary in the group pile foundation stability is the key to ensure the correct construction of the model. Currently,the safety monitoring system can not measure the warning value. Therefore,in this paper,the numerical simulation method is adoped and according to the basis of upper structural mechanical characteristics and requirements,the warning value of security and stability discriminant factors for pile group foundation is determined. The simulation shows that the method can obtain the best warning value for super- large deep- water pile group foundation after finished- bridge,aimed at the heterogeneity of pile axial force and uneven settlement.