基于间接测量法的盾构隧道损伤识别

Damage identification of shield tunnel based on indirect measurement method

为准确识别盾构隧道的损伤位置和损伤程度,将桥梁健康监测领域的研究热点间接测量法应用到盾构隧道结构中,提出一种基于双车加速度响应差灵敏度分析的盾构隧道损伤识别方法.首先,建立移动车辆和盾构隧道耦合振动模型,通过理论推导分析了采用间接测量法中的双车系统消除轨道粗糙度对车辆加速度响应不利影响的可行性;然后,推导了双车加速度响应差对损伤系数的灵敏度矩阵,构建双车加速度响应差灵敏度方程,采用稀疏正则化优化算法求解灵敏度方程识别损伤系数实现损伤识别.数值算例结果表明:本文方法可实现盾构隧道损伤的定位和定量,具有较好的噪声鲁棒性,采用较低的车速可以获得更好的损伤识别效果.

In order to accurately identify the damage location and degree of the shield tunnel, the research hotspot indirect measurement method in the field of bridge health monitoring was applied to the shield tunnel structure. A damage identification method of shield tunnel based on sensitivity analysis of acceleration response difference between two vehicles was proposed.Firstly, the coupled vibration model of moving vehicles and shield tunnels was established. Through theoretical derivation, the feasibility of eliminating the adverse effect of track roughness on vehicle acceleration response by the two vehicles system in the indirect measurement method was analyzed. Then the sensitivity matrix of the differential acceleration response to the damage coefficient of two vehicles was derived, the sensitivity equation of differential acceleration response of two vehicles was established. The sparse regularization optimization algorithm was used to solve the sensitivity equation and identify the damage coefficient to realize damage identification. The numerical example results show that the method in this paper can realize the location and quantification of shield tunnel damage. It has better noise robustness, and better damage identification effect can be obtained by using lower vehicle speed.