基于隧道-土体体系的时域子结构损伤识别方法

摘要

The degradation of the materials and the complexity of the environment for the underground structure will cause the damages, which affect the service performance of the underground structure. In order to diagnose the damage condition of the underground structure, a time-domain substructural damage identification method based on the dynamic response sensitivity model updating algorithm is proposed without the information of the input and the interface measurement. According to the complexity and super long feature of the underground structure, on the basis of the finite element model of the tunnel-soil system, the substructural dynamic response sensitivities with respect to the elemental stiffness variations and force orthogonal parameters are derived in time domain. Combining with the model reduction technique to reduce the number of degree of freedom, the damage location and extent of the tunnel are identified accurately by the proposed substructural damage identification method. Furthermore, the efficiency of the proposed method is validated comparing with the global structure analysis.%城市轨道地下结构在复杂环境和自身材质劣化等多因素作用下会产生不同程度的损伤，影响城市轨道地下结构的正常服役性能。为了实现城市地下结构的损伤诊断，本文基于动力响应灵敏度模型修正算法，提出了一种时域子结构损伤识别方法，实现了无需输入力和界面力信息情况下结构的损伤识别。针对城市地下结构的超长线状特性和复杂性，以隧道-土体体系的有限元模型为基础，推导了时域子结构动力响应关于结构刚度变化参数和力的正交参数的灵敏度矩阵，同时结合动力模型缩聚技术以降低结构的自由度数量，采用提出的时域子结构损伤识别方法可准确识别出隧道衬砌结构的损伤位置和程度，并与整体结构分析对比，验证了时域子结构识别方法的高效性。