摘要
采用三维动力有限元方法进行各种缺陷基桩低应变动测的数值模拟,包括不考虑桩周土的模型桩和考虑桩周土的工程桩,分析中桩周土阻尼主要由局部单元的结构阻尼系数来实现.并且采用所模拟的基桩动测结果形成丰富和可靠的参考样本,进行基桩完整性的神经网络诊断.数值算例中,首先模拟了简单完整桩以及典型模型桩和工程桩,然后完成了各种缺陷类型的150余根模型桩和工程桩的数值模拟,并以此作为参考样本对模型桩和工程桩的完整性进行预测和诊断,结果验证了诊断方法的有效性.
The 3-D finite element method（FEM） of structural dynamic mechanics is employed to simulate the low strain dynamic response by pile integrity tester（PIT） for piles of several defect types.The numerical results are obtained for the model piles free of soil and engineering piles surrounded with soil.The soil damping is modeled by the structural damping coefficients of local elements and the resulting numerical database is used to produce the learning samples for the artificial neural net（ANN） to diagnose the pile quality.In the numerical examples,the approach are examined by the simple good pile and the typical model and engineering piles.Then the responses of more than 150 model piles and enginnering piles of several defects types are computed.In addition,they are used as the ANN learning samples to predict the integrity of actul model pile and engineering pile.The satisfactory results indicate the approach is effective.
出处
《厦门大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第6期826-831,共6页
Journal of Xiamen University：Natural Science
基金
福建省科技项目(2007F3096)
关键词
数值模拟
有限元方法
基桩
动力检测
质量诊断
numerical simulation
finite element method
foundation pile
dynamic integrity testing
quality diagnosis
