Abstract
Throughout engineering construction, large deformation disasters in soft rock tunnels are encountered increasingly frequently. Therefore, structural health monitoring not only ensures accurate construction management but also provides a basis for dynamic adjustment of the support structure. The existing monitoring technology has certain shortcomings, such as poor anti-interference ability, non-real-time operation, and great security risks. Consequently, high-precision real-time monitoring has become a key scientific issue in tunnel engineering. For this work, multisource information fusion technology was adopted, while data security reserve systems, such as cloud server (ECS) based on the fiber Bragg grating multisource sensing system, cloud database (RDS), and cloud website, were embedded into the No. 2 inclined shaft of the Muzhailing tunnel. Based on the negative Poisson’s ratio (NPR) anchor cable control technology for large deformation of the soft rock in the No. 2 inclined shaft of the Muzhailing tunnel, reasonable and effective intelligent monitoring was carried out for tunnel construction. Monitoring and early warning cloud service platforms, based on the Internet of Things and cloud technology, could quickly produce query and statistic tunnel monitoring information. The monitoring system provided the collection, transmission, storage, processing, and early warning information sending of data, such as NPR anchor cable axial force, steel arch stress, deep surrounding rock displacement, surrounding rock deformation, and contact pressure between primary support with secondary lining. This monitoring system ensured construction safety and provided monitoring application case support for the related problems of similar projects.
Highlights
In recent years, the construction of railway and highway tunnels in China has been abruptly developed [1,2,3]
B Left spandrel C Right spandrel the anchor cable dynamometer was installed at XK1 +765/777/775/790 sections
The control effect of the negative Poisson’s ratio (NPR) anchor cable on the surrounding rock was evaluated through the axial force of NPR anchor cable monitoring
Summary
The construction of railway and highway tunnels in China has been abruptly developed [1,2,3]. Fiber Bragg grating (FBG) sensor technology is characterized by strong antielectromagnetic interference capability, wide measurement range, low transmission loss, high precision, and strong real-time performance. It has been proved as especially suitable for large projects, such as dams, tunnels, bridges, and highways, which require real-time monitoring of multiple parameters (strain, temperature, and vibration) [18,19,20]. Tao Zhigang and colleagues established the Newtonian force change monitoring and early warning system through multisource information fusion technology utilization, which satisfied the requirement for landslide disaster monitoring and early warning within a complex environment [26] The latter systems provided a rich platform for data collection, transmission, management, analysis and release for the monitoring, and warning of engineering disasters, while a significant amount of research results was obtained. Bragg grating sensors, which were arranged and installed on the object under testing, to realize the various deformation parameter measurements of this object under testing
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