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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Identification of Ground Intrusion in Underground Structures Based on Distributed Structural Vibration Detected by Ultra-Weak FBG Sensing Technology
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Identification of Ground Intrusion in Underground Structures Based on Distributed Structural Vibration Detected by Ultra-Weak FBG Sensing Technology

机译：基于超弱FBG传感技术的分布式结构振动识别地下结构中的地面侵入

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摘要

It is challenging for engineers to timely identify illegal ground intrusions in underground systems such as subways. In order to prevent the catastrophic collapse of subway tunnels from intrusion events, this paper investigated the capability of detecting the ground intrusion of underground structures based on dynamic measurement of distributed fiber optic sensing. For an actual subway tunnel monitored by the ultra-weak fiber optic Bragg grating (FBG) sensing fiber with a spatial resolution of five meters, a simulated experiment of the ground intrusion along the selected path was designed and implemented, in which a hydraulic excavator was chosen to exert intrusion perturbations with different strengths and modes at five selected intrusion sites. For each intrusion place, the distributed vibration responses of sensing fibers mounted on the tunnel wall and the track bed were detected to identify the occurrence and characteristics of the intrusion event simulated by the discrete and continuous pulses of the excavator under two loading postures. By checking the on-site records of critical moments in the intrusion process, the proposed detection approach based on distributed structural vibration responses for the ground intrusion can detect the occurrence of intrusion events, locate the intrusion ground area, and distinguish intrusion strength and typical perturbation modes.
机译：对于工程师而言，及时识别地下系统（例如地铁）中的非法地面入侵行为具有挑战性。为了防止地铁隧道的灾难性倒塌，防止入侵事件发生，本文研究了基于分布式光纤传感动态测量的地下结构地面入侵检测能力。对于空间分辨率为5米的超弱光纤布拉格光栅（FBG）传感光纤监控的实际地铁隧道，设计并实施了沿所选路径的地面侵入的模拟实验，其中使用了液压挖掘机。选择在五个选定的入侵位置施加不同强度和模式的入侵扰动。对于每个侵入位置，检测安装在隧道壁和轨道床上的传感纤维的分布振动响应，以识别在两个加载姿势下挖掘机的离散和连续脉冲模拟的侵入事件的发生和特征。通过检查入侵过程中关键时刻的现场记录，提出的基于分布式结构振动响应的地面入侵检测方法可以检测到入侵事件的发生，确定入侵地面区域，并区分入侵强度和典型扰动模式。

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