基于小波包能量谱的盾构隧道结构损伤识别分析

Damage identification of shield tunnel based on wavelet packet energy spectrum

地铁隧道作为城市轨道交通的重要组成部分,其建设和运营对于城市的正常运转至关重要。结合盾构隧道结构特点,提出一种基于分布式识别策略的盾构隧道结构损伤定位方法。具体地,以缩尺盾构隧道模型为研究对象,分别对其进行数值模拟与试验测试,结合小波包能量谱法分析移动荷载作用下结构损伤前后的动力响应信号,进行损伤识别。结果表明该方法可有效识别盾构隧道的损伤。然后,基于互信息将盾构隧道结构划分为线性连接的子区间,并验证了基于互信息的子区间划分,可以确保子区间损伤可探测性,同时减少了信息的冗余度;相对于通常的整体识别方法,计算量小,识别效率高。

As an important part of urban rail transit, the construction and operation of the subway tunnel is very important for the normal operation of the city. According to the characteristics of shield tunnel structure, a new damage location method for shield tunnels structure based on distributed identification strategy is proposed. Specifically, taking the scaled shield tunnel model as the research object, the numerical simulations and experimental studies are carried out respectively, and the dynamic response signals before and after the structural damage under moving loads are analyzed by the wavelet packet energy spectrum method to identify the damage. The results demonstrate that the method can effectively identify the damage of shield tunnel. Then, the shield tunnel structure is divided into linearly connected subintervals based on mutual information, and it is verified that the subinterval partition based on mutual information can ensure the detectability of subinterval damage and reduce the redundancy of information. Compared with the common whole recognition method, the computation is small and the recognition efficiency is high.